> and <<category>> are removed, < > and <<hr>> are + * converted into correct XHTML and Unicode characters are converted to the + * valid range. + * + * @since 0.71 + * + * @param string $content String of characters to be converted. + * @param string $deprecated Not used. + * @return string Converted string. + */ +function convert_chars($content, $deprecated = '') { + if ( !empty( $deprecated ) ) + _deprecated_argument( __FUNCTION__, '0.71' ); + + // Translation of invalid Unicode references range to valid range + $wp_htmltranswinuni = array( + '€' => '€', // the Euro sign + '' => '', + '‚' => '‚', // these are Windows CP1252 specific characters + 'ƒ' => 'ƒ', // they would look weird on non-Windows browsers + '„' => '„', + '…' => '…', + '†' => '†', + '‡' => '‡', + 'ˆ' => 'ˆ', + '‰' => '‰', + 'Š' => 'Š', + '‹' => '‹', + 'Œ' => 'Œ', + '' => '', + 'Ž' => 'Ž', + '' => '', + '' => '', + '‘' => '‘', + '’' => '’', + '“' => '“', + '”' => '”', + '•' => '•', + '–' => '–', + '—' => '—', + '˜' => '˜', + '™' => '™', + 'š' => 'š', + '›' => '›', + 'œ' => 'œ', + '' => '', + 'ž' => 'ž', + 'Ÿ' => 'Ÿ' + ); + + // Remove metadata tags + $content = preg_replace('/<title>(.+?)<\/title>/','',$content); + $content = preg_replace('/<category>(.+?)<\/category>/','',$content); + + // Converts lone & characters into & (a.k.a. &) + $content = preg_replace('/&([^#])(?![a-z1-4]{1,8};)/i', '&$1', $content); + + // Fix Word pasting + $content = strtr($content, $wp_htmltranswinuni); + + // Just a little XHTML help + $content = str_replace(' ', ' ', $content); + $content = str_replace('<hr>', '<hr />', $content); + + return $content; +} + +/** + * Balances tags if forced to, or if the 'use_balanceTags' option is set to true. + * + * @since 0.71 + * + * @param string $text Text to be balanced + * @param bool $force If true, forces balancing, ignoring the value of the option. Default false. + * @return string Balanced text + */ +function balanceTags( $text, $force = false ) { + if ( $force || get_option('use_balanceTags') == 1 ) + return force_balance_tags( $text ); + else + return $text; +} + +/** + * Balances tags of string using a modified stack. + * + * @since 2.0.4 + * + * @author Leonard Lin <leonard@acm.org> + * @license GPL + * @copyright November 4, 2001 + * @version 1.1 + * @todo Make better - change loop condition to $text in 1.2 + * @internal Modified by Scott Reilly (coffee2code) 02 Aug 2004 + * 1.1 Fixed handling of append/stack pop order of end text + * Added Cleaning Hooks + * 1.0 First Version + * + * @param string $text Text to be balanced. + * @return string Balanced text. + */ +function force_balance_tags( $text ) { + $tagstack = array(); + $stacksize = 0; + $tagqueue = ''; + $newtext = ''; + // Known single-entity/self-closing tags + $single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source' ); + // Tags that can be immediately nested within themselves + $nestable_tags = array( 'blockquote', 'div', 'object', 'q', 'span' ); + + // WP bug fix for comments - in case you REALLY meant to type '< !--' + $text = str_replace('< !--', '< !--', $text); + // WP bug fix for LOVE <3 (and other situations with '<' before a number) + $text = preg_replace('#<([0-9]{1})#', '<$1', $text); + + while ( preg_match("/<(\/?[\w:]*)\s*([^>]*)>/", $text, $regex) ) { + $newtext .= $tagqueue; + + $i = strpos($text, $regex[0]); + $l = strlen($regex[0]); + + // clear the shifter + $tagqueue = ''; + // Pop or Push + if ( isset($regex[1][0]) && '/' == $regex[1][0] ) { // End Tag + $tag = strtolower(substr($regex[1],1)); + // if too many closing tags + if( $stacksize <= 0 ) { + $tag = ''; + // or close to be safe $tag = '/' . $tag; + } + // if stacktop value = tag close value then pop + else if ( $tagstack[$stacksize - 1] == $tag ) { // found closing tag + $tag = '</' . $tag . '>'; // Close Tag + // Pop + array_pop( $tagstack ); + $stacksize--; + } else { // closing tag not at top, search for it + for ( $j = $stacksize-1; $j >= 0; $j-- ) { + if ( $tagstack[$j] == $tag ) { + // add tag to tagqueue + for ( $k = $stacksize-1; $k >= $j; $k--) { + $tagqueue .= '</' . array_pop( $tagstack ) . '>'; + $stacksize--; + } + break; + } + } + $tag = ''; + } + } else { // Begin Tag + $tag = strtolower($regex[1]); + + // Tag Cleaning + + // If it's an empty tag "< >", do nothing + if ( '' == $tag ) { + // do nothing + } + // ElseIf it presents itself as a self-closing tag... + elseif ( substr( $regex[2], -1 ) == '/' ) { + // ...but it isn't a known single-entity self-closing tag, then don't let it be treated as such and + // immediately close it with a closing tag (the tag will encapsulate no text as a result) + if ( ! in_array( $tag, $single_tags ) ) + $regex[2] = trim( substr( $regex[2], 0, -1 ) ) . "></$tag"; + } + // ElseIf it's a known single-entity tag but it doesn't close itself, do so + elseif ( in_array($tag, $single_tags) ) { + $regex[2] .= '/'; + } + // Else it's not a single-entity tag + else { + // If the top of the stack is the same as the tag we want to push, close previous tag + if ( $stacksize > 0 && !in_array($tag, $nestable_tags) && $tagstack[$stacksize - 1] == $tag ) { + $tagqueue = '</' . array_pop( $tagstack ) . '>'; + $stacksize--; + } + $stacksize = array_push( $tagstack, $tag ); + } + + // Attributes + $attributes = $regex[2]; + if( ! empty( $attributes ) && $attributes[0] != '>' ) + $attributes = ' ' . $attributes; + + $tag = '<' . $tag . $attributes . '>'; + //If already queuing a close tag, then put this tag on, too + if ( !empty($tagqueue) ) { + $tagqueue .= $tag; + $tag = ''; + } + } + $newtext .= substr($text, 0, $i) . $tag; + $text = substr($text, $i + $l); + } + + // Clear Tag Queue + $newtext .= $tagqueue; + + // Add Remaining text + $newtext .= $text; + + // Empty Stack + while( $x = array_pop($tagstack) ) + $newtext .= '</' . $x . '>'; // Add remaining tags to close + + // WP fix for the bug with HTML comments + $newtext = str_replace("< !--","<!--",$newtext); + $newtext = str_replace("< !--","< !--",$newtext); + + return $newtext; +} + +/** + * Acts on text which is about to be edited. + * + * The $content is run through esc_textarea(), which uses htmlspecialchars() + * to convert special characters to HTML entities. If $richedit is set to true, + * it is simply a holder for the 'format_to_edit' filter. + * + * @since 0.71 + * + * @param string $content The text about to be edited. + * @param bool $richedit Whether the $content should not pass through htmlspecialchars(). Default false (meaning it will be passed). + * @return string The text after the filter (and possibly htmlspecialchars()) has been run. + */ +function format_to_edit( $content, $richedit = false ) { + $content = apply_filters( 'format_to_edit', $content ); + if ( ! $richedit ) + $content = esc_textarea( $content ); + return $content; +} + +/** + * Holder for the 'format_to_post' filter. + * + * @since 0.71 + * + * @param string $content The text to pass through the filter. + * @return string Text returned from the 'format_to_post' filter. + */ +function format_to_post($content) { + $content = apply_filters('format_to_post', $content); + return $content; +} + +/** + * Add leading zeros when necessary. + * + * If you set the threshold to '4' and the number is '10', then you will get + * back '0010'. If you set the threshold to '4' and the number is '5000', then you + * will get back '5000'. + * + * Uses sprintf to append the amount of zeros based on the $threshold parameter + * and the size of the number. If the number is large enough, then no zeros will + * be appended. + * + * @since 0.71 + * + * @param mixed $number Number to append zeros to if not greater than threshold. + * @param int $threshold Digit places number needs to be to not have zeros added. + * @return string Adds leading zeros to number if needed. + */ +function zeroise($number, $threshold) { + return sprintf('%0'.$threshold.'s', $number); +} + +/** + * Adds backslashes before letters and before a number at the start of a string. + * + * @since 0.71 + * + * @param string $string Value to which backslashes will be added. + * @return string String with backslashes inserted. + */ +function backslashit($string) { + if ( isset( $string[0] ) && $string[0] >= '0' && $string[0] <= '9' ) + $string = '\\\\' . $string; + return addcslashes( $string, 'A..Za..z' ); +} + +/** + * Appends a trailing slash. + * + * Will remove trailing slash if it exists already before adding a trailing + * slash. This prevents double slashing a string or path. + * + * The primary use of this is for paths and thus should be used for paths. It is + * not restricted to paths and offers no specific path support. + * + * @since 1.2.0 + * @uses untrailingslashit() Unslashes string if it was slashed already. + * + * @param string $string What to add the trailing slash to. + * @return string String with trailing slash added. + */ +function trailingslashit($string) { + return untrailingslashit($string) . '/'; +} + +/** + * Removes trailing slash if it exists. + * + * The primary use of this is for paths and thus should be used for paths. It is + * not restricted to paths and offers no specific path support. + * + * @since 2.2.0 + * + * @param string $string What to remove the trailing slash from. + * @return string String without the trailing slash. + */ +function untrailingslashit($string) { + return rtrim($string, '/'); +} + +/** + * Adds slashes to escape strings. + * + * Slashes will first be removed if magic_quotes_gpc is set, see {@link + * http://www.php.net/magic_quotes} for more details. + * + * @since 0.71 + * + * @param string $gpc The string returned from HTTP request data. + * @return string Returns a string escaped with slashes. + */ +function addslashes_gpc($gpc) { + if ( get_magic_quotes_gpc() ) + $gpc = stripslashes($gpc); + + return wp_slash($gpc); +} + +/** + * Navigates through an array and removes slashes from the values. + * + * If an array is passed, the array_map() function causes a callback to pass the + * value back to the function. The slashes from this value will removed. + * + * @since 2.0.0 + * + * @param mixed $value The value to be stripped. + * @return mixed Stripped value. + */ +function stripslashes_deep($value) { + if ( is_array($value) ) { + $value = array_map('stripslashes_deep', $value); + } elseif ( is_object($value) ) { + $vars = get_object_vars( $value ); + foreach ($vars as $key=>$data) { + $value->{$key} = stripslashes_deep( $data ); + } + } elseif ( is_string( $value ) ) { + $value = stripslashes($value); + } + + return $value; +} + +/** + * Navigates through an array and encodes the values to be used in a URL. + * + * + * @since 2.2.0 + * + * @param array|string $value The array or string to be encoded. + * @return array|string $value The encoded array (or string from the callback). + */ +function urlencode_deep($value) { + $value = is_array($value) ? array_map('urlencode_deep', $value) : urlencode($value); + return $value; +} + +/** + * Navigates through an array and raw encodes the values to be used in a URL. + * + * @since 3.4.0 + * + * @param array|string $value The array or string to be encoded. + * @return array|string $value The encoded array (or string from the callback). + */ +function rawurlencode_deep( $value ) { + return is_array( $value ) ? array_map( 'rawurlencode_deep', $value ) : rawurlencode( $value ); +} + +/** + * Converts email addresses characters to HTML entities to block spam bots. + * + * @since 0.71 + * + * @param string $email_address Email address. + * @param int $hex_encoding Optional. Set to 1 to enable hex encoding. + * @return string Converted email address. + */ +function antispambot( $email_address, $hex_encoding = 0 ) { + $email_no_spam_address = ''; + for ( $i = 0; $i < strlen( $email_address ); $i++ ) { + $j = rand( 0, 1 + $hex_encoding ); + if ( $j == 0 ) { + $email_no_spam_address .= '&#' . ord( $email_address[$i] ) . ';'; + } elseif ( $j == 1 ) { + $email_no_spam_address .= $email_address[$i]; + } elseif ( $j == 2 ) { + $email_no_spam_address .= '%' . zeroise( dechex( ord( $email_address[$i] ) ), 2 ); + } + } + + $email_no_spam_address = str_replace( '@', '@', $email_no_spam_address ); + + return $email_no_spam_address; +} + +/** + * Callback to convert URI match to HTML A element. + * + * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link + * make_clickable()}. + * + * @since 2.3.2 + * @access private + * + * @param array $matches Single Regex Match. + * @return string HTML A element with URI address. + */ +function _make_url_clickable_cb($matches) { + $url = $matches[2]; + + if ( ')' == $matches[3] && strpos( $url, '(' ) ) { + // If the trailing character is a closing parethesis, and the URL has an opening parenthesis in it, add the closing parenthesis to the URL. + // Then we can let the parenthesis balancer do its thing below. + $url .= $matches[3]; + $suffix = ''; + } else { + $suffix = $matches[3]; + } + + // Include parentheses in the URL only if paired + while ( substr_count( $url, '(' ) < substr_count( $url, ')' ) ) { + $suffix = strrchr( $url, ')' ) . $suffix; + $url = substr( $url, 0, strrpos( $url, ')' ) ); + } + + $url = esc_url($url); + if ( empty($url) ) + return $matches[0]; + + return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $suffix; +} + +/** + * Callback to convert URL match to HTML A element. + * + * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link + * make_clickable()}. + * + * @since 2.3.2 + * @access private + * + * @param array $matches Single Regex Match. + * @return string HTML A element with URL address. + */ +function _make_web_ftp_clickable_cb($matches) { + $ret = ''; + $dest = $matches[2]; + $dest = 'http://' . $dest; + $dest = esc_url($dest); + if ( empty($dest) ) + return $matches[0]; + + // removed trailing [.,;:)] from URL + if ( in_array( substr($dest, -1), array('.', ',', ';', ':', ')') ) === true ) { + $ret = substr($dest, -1); + $dest = substr($dest, 0, strlen($dest)-1); + } + return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>$ret"; +} + +/** + * Callback to convert email address match to HTML A element. + * + * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link + * make_clickable()}. + * + * @since 2.3.2 + * @access private + * + * @param array $matches Single Regex Match. + * @return string HTML A element with email address. + */ +function _make_email_clickable_cb($matches) { + $email = $matches[2] . '@' . $matches[3]; + return $matches[1] . "<a href=\"mailto:$email\">$email</a>"; +} + +/** + * Convert plaintext URI to HTML links. + * + * Converts URI, www and ftp, and email addresses. Finishes by fixing links + * within links. + * + * @since 0.71 + * + * @param string $text Content to convert URIs. + * @return string Content with converted URIs. + */ +function make_clickable( $text ) { + $r = ''; + $textarr = preg_split( '/(<[^<>]+>)/', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // split out HTML tags + foreach ( $textarr as $piece ) { + if ( empty( $piece ) || ( $piece[0] == '<' && ! preg_match('|^<\s*[\w]{1,20}+://|', $piece) ) ) { + $r .= $piece; + continue; + } + + // Long strings might contain expensive edge cases ... + if ( 10000 < strlen( $piece ) ) { + // ... break it up + foreach ( _split_str_by_whitespace( $piece, 2100 ) as $chunk ) { // 2100: Extra room for scheme and leading and trailing paretheses + if ( 2101 < strlen( $chunk ) ) { + $r .= $chunk; // Too big, no whitespace: bail. + } else { + $r .= make_clickable( $chunk ); + } + } + } else { + $ret = " $piece "; // Pad with whitespace to simplify the regexes + + $url_clickable = '~ + ([\\s(<.,;:!?]) # 1: Leading whitespace, or punctuation + ( # 2: URL + [\\w]{1,20}+:// # Scheme and hier-part prefix + (?=\S{1,2000}\s) # Limit to URLs less than about 2000 characters long + [\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]*+ # Non-punctuation URL character + (?: # Unroll the Loop: Only allow puctuation URL character if followed by a non-punctuation URL character + [\'.,;:!?)] # Punctuation URL character + [\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]++ # Non-punctuation URL character + )* + ) + (\)?) # 3: Trailing closing parenthesis (for parethesis balancing post processing) + ~xS'; // The regex is a non-anchored pattern and does not have a single fixed starting character. + // Tell PCRE to spend more time optimizing since, when used on a page load, it will probably be used several times. + + $ret = preg_replace_callback( $url_clickable, '_make_url_clickable_cb', $ret ); + + $ret = preg_replace_callback( '#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]+)#is', '_make_web_ftp_clickable_cb', $ret ); + $ret = preg_replace_callback( '#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret ); + + $ret = substr( $ret, 1, -1 ); // Remove our whitespace padding. + $r .= $ret; + } + } + + // Cleanup of accidental links within links + $r = preg_replace( '#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i', "$1$3</a>", $r ); + return $r; +} + +/** + * Breaks a string into chunks by splitting at whitespace characters. + * The length of each returned chunk is as close to the specified length goal as possible, + * with the caveat that each chunk includes its trailing delimiter. + * Chunks longer than the goal are guaranteed to not have any inner whitespace. + * + * Joining the returned chunks with empty delimiters reconstructs the input string losslessly. + * + * Input string must have no null characters (or eventual transformations on output chunks must not care about null characters) + * + * <code> + * _split_str_by_whitespace( "1234 67890 1234 67890a cd 1234 890 123456789 1234567890a 45678 1 3 5 7 90 ", 10 ) == + * array ( + * 0 => '1234 67890 ', // 11 characters: Perfect split + * 1 => '1234 ', // 5 characters: '1234 67890a' was too long + * 2 => '67890a cd ', // 10 characters: '67890a cd 1234' was too long + * 3 => '1234 890 ', // 11 characters: Perfect split + * 4 => '123456789 ', // 10 characters: '123456789 1234567890a' was too long + * 5 => '1234567890a ', // 12 characters: Too long, but no inner whitespace on which to split + * 6 => ' 45678 ', // 11 characters: Perfect split + * 7 => '1 3 5 7 9', // 9 characters: End of $string + * ); + * </code> + * + * @since 3.4.0 + * @access private + * + * @param string $string The string to split. + * @param int $goal The desired chunk length. + * @return array Numeric array of chunks. + */ +function _split_str_by_whitespace( $string, $goal ) { + $chunks = array(); + + $string_nullspace = strtr( $string, "\r\n\t\v\f ", "\000\000\000\000\000\000" ); + + while ( $goal < strlen( $string_nullspace ) ) { + $pos = strrpos( substr( $string_nullspace, 0, $goal + 1 ), "\000" ); + + if ( false === $pos ) { + $pos = strpos( $string_nullspace, "\000", $goal + 1 ); + if ( false === $pos ) { + break; + } + } + + $chunks[] = substr( $string, 0, $pos + 1 ); + $string = substr( $string, $pos + 1 ); + $string_nullspace = substr( $string_nullspace, $pos + 1 ); + } + + if ( $string ) { + $chunks[] = $string; + } + + return $chunks; +} + +/** + * Adds rel nofollow string to all HTML A elements in content. + * + * @since 1.5.0 + * + * @param string $text Content that may contain HTML A elements. + * @return string Converted content. + */ +function wp_rel_nofollow( $text ) { + // This is a pre save filter, so text is already escaped. + $text = stripslashes($text); + $text = preg_replace_callback('|<a (.+?)>|i', 'wp_rel_nofollow_callback', $text); + $text = wp_slash($text); + return $text; +} + +/** + * Callback to add rel=nofollow string to HTML A element. + * + * Will remove already existing rel="nofollow" and rel='nofollow' from the + * string to prevent from invalidating (X)HTML. + * + * @since 2.3.0 + * + * @param array $matches Single Match + * @return string HTML A Element with rel nofollow. + */ +function wp_rel_nofollow_callback( $matches ) { + $text = $matches[1]; + $text = str_replace(array(' rel="nofollow"', " rel='nofollow'"), '', $text); + return "<a $text rel=\"nofollow\">"; +} + +/** + * Convert one smiley code to the icon graphic file equivalent. + * + * Callback handler for {@link convert_smilies()}. + * Looks up one smiley code in the $wpsmiliestrans global array and returns an + * <img> string for that smiley. + * + * @global array $wpsmiliestrans + * @since 2.8.0 + * + * @param array $matches Single match. Smiley code to convert to image. + * @return string Image string for smiley. + */ +function translate_smiley( $matches ) { + global $wpsmiliestrans; + + if ( count( $matches ) == 0 ) + return ''; + + $smiley = trim( reset( $matches ) ); + $img = $wpsmiliestrans[ $smiley ]; + $smiley_masked = esc_attr( $smiley ); + + $src_url = apply_filters( 'smilies_src', includes_url( "images/smilies/$img" ), $img, site_url() ); + + return " <img src='$src_url' alt='$smiley_masked' class='wp-smiley' /> "; +} + +/** + * Convert text equivalent of smilies to images. + * + * Will only convert smilies if the option 'use_smilies' is true and the global + * used in the function isn't empty. + * + * @since 0.71 + * @uses $wp_smiliessearch + * + * @param string $text Content to convert smilies from text. + * @return string Converted content with text smilies replaced with images. + */ +function convert_smilies($text) { + global $wp_smiliessearch; + $output = ''; + if ( get_option('use_smilies') && !empty($wp_smiliessearch) ) { + // HTML loop taken from texturize function, could possible be consolidated + $textarr = preg_split("/(<.*>)/U", $text, -1, PREG_SPLIT_DELIM_CAPTURE); // capture the tags as well as in between + $stop = count($textarr);// loop stuff + for ($i = 0; $i < $stop; $i++) { + $content = $textarr[$i]; + if ((strlen($content) > 0) && ('<' != $content[0])) { // If it's not a tag + $content = preg_replace_callback($wp_smiliessearch, 'translate_smiley', $content); + } + $output .= $content; + } + } else { + // return default text. + $output = $text; + } + return $output; +} + +/** + * Verifies that an email is valid. + * + * Does not grok i18n domains. Not RFC compliant. + * + * @since 0.71 + * + * @param string $email Email address to verify. + * @param boolean $deprecated Deprecated. + * @return string|bool Either false or the valid email address. + */ +function is_email( $email, $deprecated = false ) { + if ( ! empty( $deprecated ) ) + _deprecated_argument( __FUNCTION__, '3.0' ); + + // Test for the minimum length the email can be + if ( strlen( $email ) < 3 ) { + return apply_filters( 'is_email', false, $email, 'email_too_short' ); + } + + // Test for an @ character after the first position + if ( strpos( $email, '@', 1 ) === false ) { + return apply_filters( 'is_email', false, $email, 'email_no_at' ); + } + + // Split out the local and domain parts + list( $local, $domain ) = explode( '@', $email, 2 ); + + // LOCAL PART + // Test for invalid characters + if ( !preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]+$/', $local ) ) { + return apply_filters( 'is_email', false, $email, 'local_invalid_chars' ); + } + + // DOMAIN PART + // Test for sequences of periods + if ( preg_match( '/\.{2,}/', $domain ) ) { + return apply_filters( 'is_email', false, $email, 'domain_period_sequence' ); + } + + // Test for leading and trailing periods and whitespace + if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) { + return apply_filters( 'is_email', false, $email, 'domain_period_limits' ); + } + + // Split the domain into subs + $subs = explode( '.', $domain ); + + // Assume the domain will have at least two subs + if ( 2 > count( $subs ) ) { + return apply_filters( 'is_email', false, $email, 'domain_no_periods' ); + } + + // Loop through each sub + foreach ( $subs as $sub ) { + // Test for leading and trailing hyphens and whitespace + if ( trim( $sub, " \t\n\r\0\x0B-" ) !== $sub ) { + return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' ); + } + + // Test for invalid characters + if ( !preg_match('/^[a-z0-9-]+$/i', $sub ) ) { + return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' ); + } + } + + // Congratulations your email made it! + return apply_filters( 'is_email', $email, $email, null ); +} + +/** + * Convert to ASCII from email subjects. + * + * @since 1.2.0 + * + * @param string $string Subject line + * @return string Converted string to ASCII + */ +function wp_iso_descrambler($string) { + /* this may only work with iso-8859-1, I'm afraid */ + if (!preg_match('#\=\?(.+)\?Q\?(.+)\?\=#i', $string, $matches)) { + return $string; + } else { + $subject = str_replace('_', ' ', $matches[2]); + $subject = preg_replace_callback('#\=([0-9a-f]{2})#i', '_wp_iso_convert', $subject); + return $subject; + } +} + +/** + * Helper function to convert hex encoded chars to ASCII + * + * @since 3.1.0 + * @access private + * + * @param array $match The preg_replace_callback matches array + * @return array Converted chars + */ +function _wp_iso_convert( $match ) { + return chr( hexdec( strtolower( $match[1] ) ) ); +} + +/** + * Returns a date in the GMT equivalent. + * + * Requires and returns a date in the Y-m-d H:i:s format. If there is a + * timezone_string available, the date is assumed to be in that timezone, + * otherwise it simply subtracts the value of the 'gmt_offset' option. Return + * format can be overridden using the $format parameter. + * + * @since 1.2.0 + * + * @uses get_option() to retrieve the value of 'gmt_offset'. + * @param string $string The date to be converted. + * @param string $format The format string for the returned date (default is Y-m-d H:i:s) + * @return string GMT version of the date provided. + */ +function get_gmt_from_date( $string, $format = 'Y-m-d H:i:s' ) { + $tz = get_option( 'timezone_string' ); + if ( $tz ) { + $datetime = date_create( $string, new DateTimeZone( $tz ) ); + if ( ! $datetime ) + return gmdate( $format, 0 ); + $datetime->setTimezone( new DateTimeZone( 'UTC' ) ); + $string_gmt = $datetime->format( $format ); + } else { + if ( ! preg_match( '#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches ) ) + return gmdate( $format, 0 ); + $string_time = gmmktime( $matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1] ); + $string_gmt = gmdate( $format, $string_time - get_option( 'gmt_offset' ) * HOUR_IN_SECONDS ); + } + return $string_gmt; +} + +/** + * Converts a GMT date into the correct format for the blog. + * + * Requires and returns a date in the Y-m-d H:i:s format. If there is a + * timezone_string available, the returned date is in that timezone, otherwise + * it simply adds the value of gmt_offset. Return format can be overridden + * using the $format parameter + * + * @since 1.2.0 + * + * @param string $string The date to be converted. + * @param string $format The format string for the returned date (default is Y-m-d H:i:s) + * @return string Formatted date relative to the timezone / GMT offset. + */ +function get_date_from_gmt( $string, $format = 'Y-m-d H:i:s' ) { + $tz = get_option( 'timezone_string' ); + if ( $tz ) { + $datetime = date_create( $string, new DateTimeZone( 'UTC' ) ); + if ( ! $datetime ) + return date( $format, 0 ); + $datetime->setTimezone( new DateTimeZone( $tz ) ); + $string_localtime = $datetime->format( $format ); + } else { + if ( ! preg_match('#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches) ) + return date( $format, 0 ); + $string_time = gmmktime( $matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1] ); + $string_localtime = gmdate( $format, $string_time + get_option( 'gmt_offset' ) * HOUR_IN_SECONDS ); + } + return $string_localtime; +} + +/** + * Computes an offset in seconds from an iso8601 timezone. + * + * @since 1.5.0 + * + * @param string $timezone Either 'Z' for 0 offset or '±hhmm'. + * @return int|float The offset in seconds. + */ +function iso8601_timezone_to_offset($timezone) { + // $timezone is either 'Z' or '[+|-]hhmm' + if ($timezone == 'Z') { + $offset = 0; + } else { + $sign = (substr($timezone, 0, 1) == '+') ? 1 : -1; + $hours = intval(substr($timezone, 1, 2)); + $minutes = intval(substr($timezone, 3, 4)) / 60; + $offset = $sign * HOUR_IN_SECONDS * ($hours + $minutes); + } + return $offset; +} + +/** + * Converts an iso8601 date to MySQL DateTime format used by post_date[_gmt]. + * + * @since 1.5.0 + * + * @param string $date_string Date and time in ISO 8601 format {@link http://en.wikipedia.org/wiki/ISO_8601}. + * @param string $timezone Optional. If set to GMT returns the time minus gmt_offset. Default is 'user'. + * @return string The date and time in MySQL DateTime format - Y-m-d H:i:s. + */ +function iso8601_to_datetime($date_string, $timezone = 'user') { + $timezone = strtolower($timezone); + + if ($timezone == 'gmt') { + + preg_match('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[\+|\-][0-9]{2,4}){0,1}#', $date_string, $date_bits); + + if (!empty($date_bits[7])) { // we have a timezone, so let's compute an offset + $offset = iso8601_timezone_to_offset($date_bits[7]); + } else { // we don't have a timezone, so we assume user local timezone (not server's!) + $offset = HOUR_IN_SECONDS * get_option('gmt_offset'); + } + + $timestamp = gmmktime($date_bits[4], $date_bits[5], $date_bits[6], $date_bits[2], $date_bits[3], $date_bits[1]); + $timestamp -= $offset; + + return gmdate('Y-m-d H:i:s', $timestamp); + + } else if ($timezone == 'user') { + return preg_replace('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[\+|\-][0-9]{2,4}){0,1}#', '$1-$2-$3 $4:$5:$6', $date_string); + } +} + +/** + * Adds a element attributes to open links in new windows. + * + * Comment text in popup windows should be filtered through this. Right now it's + * a moderately dumb function, ideally it would detect whether a target or rel + * attribute was already there and adjust its actions accordingly. + * + * @since 0.71 + * + * @param string $text Content to replace links to open in a new window. + * @return string Content that has filtered links. + */ +function popuplinks($text) { + $text = preg_replace('/<a (.+?)>/i', "<a $1 target='_blank' rel='external'>", $text); + return $text; +} + +/** + * Strips out all characters that are not allowable in an email. + * + * @since 1.5.0 + * + * @param string $email Email address to filter. + * @return string Filtered email address. + */ +function sanitize_email( $email ) { + // Test for the minimum length the email can be + if ( strlen( $email ) < 3 ) { + return apply_filters( 'sanitize_email', '', $email, 'email_too_short' ); + } + + // Test for an @ character after the first position + if ( strpos( $email, '@', 1 ) === false ) { + return apply_filters( 'sanitize_email', '', $email, 'email_no_at' ); + } + + // Split out the local and domain parts + list( $local, $domain ) = explode( '@', $email, 2 ); + + // LOCAL PART + // Test for invalid characters + $local = preg_replace( '/[^a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]/', '', $local ); + if ( '' === $local ) { + return apply_filters( 'sanitize_email', '', $email, 'local_invalid_chars' ); + } + + // DOMAIN PART + // Test for sequences of periods + $domain = preg_replace( '/\.{2,}/', '', $domain ); + if ( '' === $domain ) { + return apply_filters( 'sanitize_email', '', $email, 'domain_period_sequence' ); + } + + // Test for leading and trailing periods and whitespace + $domain = trim( $domain, " \t\n\r\0\x0B." ); + if ( '' === $domain ) { + return apply_filters( 'sanitize_email', '', $email, 'domain_period_limits' ); + } + + // Split the domain into subs + $subs = explode( '.', $domain ); + + // Assume the domain will have at least two subs + if ( 2 > count( $subs ) ) { + return apply_filters( 'sanitize_email', '', $email, 'domain_no_periods' ); + } + + // Create an array that will contain valid subs + $new_subs = array(); + + // Loop through each sub + foreach ( $subs as $sub ) { + // Test for leading and trailing hyphens + $sub = trim( $sub, " \t\n\r\0\x0B-" ); + + // Test for invalid characters + $sub = preg_replace( '/[^a-z0-9-]+/i', '', $sub ); + + // If there's anything left, add it to the valid subs + if ( '' !== $sub ) { + $new_subs[] = $sub; + } + } + + // If there aren't 2 or more valid subs + if ( 2 > count( $new_subs ) ) { + return apply_filters( 'sanitize_email', '', $email, 'domain_no_valid_subs' ); + } + + // Join valid subs into the new domain + $domain = join( '.', $new_subs ); + + // Put the email back together + $email = $local . '@' . $domain; + + // Congratulations your email made it! + return apply_filters( 'sanitize_email', $email, $email, null ); +} + +/** + * Determines the difference between two timestamps. + * + * The difference is returned in a human readable format such as "1 hour", + * "5 mins", "2 days". + * + * @since 1.5.0 + * + * @param int $from Unix timestamp from which the difference begins. + * @param int $to Optional. Unix timestamp to end the time difference. Default becomes time() if not set. + * @return string Human readable time difference. + */ +function human_time_diff( $from, $to = '' ) { + if ( empty( $to ) ) + $to = time(); + + $diff = (int) abs( $to - $from ); + + if ( $diff < HOUR_IN_SECONDS ) { + $mins = round( $diff / MINUTE_IN_SECONDS ); + if ( $mins <= 1 ) + $mins = 1; + /* translators: min=minute */ + $since = sprintf( _n( '%s min', '%s mins', $mins ), $mins ); + } elseif ( $diff < DAY_IN_SECONDS && $diff >= HOUR_IN_SECONDS ) { + $hours = round( $diff / HOUR_IN_SECONDS ); + if ( $hours <= 1 ) + $hours = 1; + $since = sprintf( _n( '%s hour', '%s hours', $hours ), $hours ); + } elseif ( $diff < WEEK_IN_SECONDS && $diff >= DAY_IN_SECONDS ) { + $days = round( $diff / DAY_IN_SECONDS ); + if ( $days <= 1 ) + $days = 1; + $since = sprintf( _n( '%s day', '%s days', $days ), $days ); + } elseif ( $diff < 30 * DAY_IN_SECONDS && $diff >= WEEK_IN_SECONDS ) { + $weeks = round( $diff / WEEK_IN_SECONDS ); + if ( $weeks <= 1 ) + $weeks = 1; + $since = sprintf( _n( '%s week', '%s weeks', $weeks ), $weeks ); + } elseif ( $diff < YEAR_IN_SECONDS && $diff >= 30 * DAY_IN_SECONDS ) { + $months = round( $diff / ( 30 * DAY_IN_SECONDS ) ); + if ( $months <= 1 ) + $months = 1; + $since = sprintf( _n( '%s month', '%s months', $months ), $months ); + } elseif ( $diff >= YEAR_IN_SECONDS ) { + $years = round( $diff / YEAR_IN_SECONDS ); + if ( $years <= 1 ) + $years = 1; + $since = sprintf( _n( '%s year', '%s years', $years ), $years ); + } + + return $since; +} + +/** + * Generates an excerpt from the content, if needed. + * + * The excerpt word amount will be 55 words and if the amount is greater than + * that, then the string ' […]' will be appended to the excerpt. If the string + * is less than 55 words, then the content will be returned as is. + * + * The 55 word limit can be modified by plugins/themes using the excerpt_length filter + * The ' […]' string can be modified by plugins/themes using the excerpt_more filter + * + * @since 1.5.0 + * + * @param string $text Optional. The excerpt. If set to empty, an excerpt is generated. + * @return string The excerpt. + */ +function wp_trim_excerpt($text = '') { + $raw_excerpt = $text; + if ( '' == $text ) { + $text = get_the_content(''); + + $text = strip_shortcodes( $text ); + + $text = apply_filters('the_content', $text); + $text = str_replace(']]>', ']]>', $text); + $excerpt_length = apply_filters('excerpt_length', 55); + $excerpt_more = apply_filters('excerpt_more', ' ' . '[…]'); + $text = wp_trim_words( $text, $excerpt_length, $excerpt_more ); + } + return apply_filters('wp_trim_excerpt', $text, $raw_excerpt); +} + +/** + * Trims text to a certain number of words. + * + * This function is localized. For languages that count 'words' by the individual + * character (such as East Asian languages), the $num_words argument will apply + * to the number of individual characters. + * + * @since 3.3.0 + * + * @param string $text Text to trim. + * @param int $num_words Number of words. Default 55. + * @param string $more Optional. What to append if $text needs to be trimmed. Default '…'. + * @return string Trimmed text. + */ +function wp_trim_words( $text, $num_words = 55, $more = null ) { + if ( null === $more ) + $more = __( '…' ); + $original_text = $text; + $text = wp_strip_all_tags( $text ); + /* translators: If your word count is based on single characters (East Asian characters), + enter 'characters'. Otherwise, enter 'words'. Do not translate into your own language. */ + if ( 'characters' == _x( 'words', 'word count: words or characters?' ) && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) { + $text = trim( preg_replace( "/[\n\r\t ]+/", ' ', $text ), ' ' ); + preg_match_all( '/./u', $text, $words_array ); + $words_array = array_slice( $words_array[0], 0, $num_words + 1 ); + $sep = ''; + } else { + $words_array = preg_split( "/[\n\r\t ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY ); + $sep = ' '; + } + if ( count( $words_array ) > $num_words ) { + array_pop( $words_array ); + $text = implode( $sep, $words_array ); + $text = $text . $more; + } else { + $text = implode( $sep, $words_array ); + } + return apply_filters( 'wp_trim_words', $text, $num_words, $more, $original_text ); +} + +/** + * Converts named entities into numbered entities. + * + * @since 1.5.1 + * + * @param string $text The text within which entities will be converted. + * @return string Text with converted entities. + */ +function ent2ncr($text) { + + // Allow a plugin to short-circuit and override the mappings. + $filtered = apply_filters( 'pre_ent2ncr', null, $text ); + if( null !== $filtered ) + return $filtered; + + $to_ncr = array( + '"' => '"', + '&' => '&', + '<' => '<', + '>' => '>', + '|' => '|', + ' ' => ' ', + '¡' => '¡', + '¢' => '¢', + '£' => '£', + '¤' => '¤', + '¥' => '¥', + '¦' => '¦', + '&brkbar;' => '¦', + '§' => '§', + '¨' => '¨', + '¨' => '¨', + '©' => '©', + 'ª' => 'ª', + '«' => '«', + '¬' => '¬', + '' => '', + '®' => '®', + '¯' => '¯', + '&hibar;' => '¯', + '°' => '°', + '±' => '±', + '²' => '²', + '³' => '³', + '´' => '´', + 'µ' => 'µ', + '¶' => '¶', + '·' => '·', + '¸' => '¸', + '¹' => '¹', + 'º' => 'º', + '»' => '»', + '¼' => '¼', + '½' => '½', + '¾' => '¾', + '¿' => '¿', + 'À' => 'À', + 'Á' => 'Á', + 'Â' => 'Â', + 'Ã' => 'Ã', + 'Ä' => 'Ä', + 'Å' => 'Å', + 'Æ' => 'Æ', + 'Ç' => 'Ç', + 'È' => 'È', + 'É' => 'É', + 'Ê' => 'Ê', + 'Ë' => 'Ë', + 'Ì' => 'Ì', + 'Í' => 'Í', + 'Î' => 'Î', + 'Ï' => 'Ï', + 'Ð' => 'Ð', + 'Ñ' => 'Ñ', + 'Ò' => 'Ò', + 'Ó' => 'Ó', + 'Ô' => 'Ô', + 'Õ' => 'Õ', + 'Ö' => 'Ö', + '×' => '×', + 'Ø' => 'Ø', + 'Ù' => 'Ù', + 'Ú' => 'Ú', + 'Û' => 'Û', + 'Ü' => 'Ü', + 'Ý' => 'Ý', + 'Þ' => 'Þ', + 'ß' => 'ß', + 'à' => 'à', + 'á' => 'á', + 'â' => 'â', + 'ã' => 'ã', + 'ä' => 'ä', + 'å' => 'å', + 'æ' => 'æ', + 'ç' => 'ç', + 'è' => 'è', + 'é' => 'é', + 'ê' => 'ê', + 'ë' => 'ë', + 'ì' => 'ì', + 'í' => 'í', + 'î' => 'î', + 'ï' => 'ï', + 'ð' => 'ð', + 'ñ' => 'ñ', + 'ò' => 'ò', + 'ó' => 'ó', + 'ô' => 'ô', + 'õ' => 'õ', + 'ö' => 'ö', + '÷' => '÷', + 'ø' => 'ø', + 'ù' => 'ù', + 'ú' => 'ú', + 'û' => 'û', + 'ü' => 'ü', + 'ý' => 'ý', + 'þ' => 'þ', + 'ÿ' => 'ÿ', + 'Œ' => 'Œ', + 'œ' => 'œ', + 'Š' => 'Š', + 'š' => 'š', + 'Ÿ' => 'Ÿ', + 'ƒ' => 'ƒ', + 'ˆ' => 'ˆ', + '˜' => '˜', + 'Α' => 'Α', + 'Β' => 'Β', + 'Γ' => 'Γ', + 'Δ' => 'Δ', + 'Ε' => 'Ε', + 'Ζ' => 'Ζ', + 'Η' => 'Η', + 'Θ' => 'Θ', + 'Ι' => 'Ι', + 'Κ' => 'Κ', + 'Λ' => 'Λ', + 'Μ' => 'Μ', + 'Ν' => 'Ν', + 'Ξ' => 'Ξ', + 'Ο' => 'Ο', + 'Π' => 'Π', + 'Ρ' => 'Ρ', + 'Σ' => 'Σ', + 'Τ' => 'Τ', + 'Υ' => 'Υ', + 'Φ' => 'Φ', + 'Χ' => 'Χ', + 'Ψ' => 'Ψ', + 'Ω' => 'Ω', + 'α' => 'α', + 'β' => 'β', + 'γ' => 'γ', + 'δ' => 'δ', + 'ε' => 'ε', + 'ζ' => 'ζ', + 'η' => 'η', + 'θ' => 'θ', + 'ι' => 'ι', + 'κ' => 'κ', + 'λ' => 'λ', + 'μ' => 'μ', + 'ν' => 'ν', + 'ξ' => 'ξ', + 'ο' => 'ο', + 'π' => 'π', + 'ρ' => 'ρ', + 'ς' => 'ς', + 'σ' => 'σ', + 'τ' => 'τ', + 'υ' => 'υ', + 'φ' => 'φ', + 'χ' => 'χ', + 'ψ' => 'ψ', + 'ω' => 'ω', + 'ϑ' => 'ϑ', + 'ϒ' => 'ϒ', + 'ϖ' => 'ϖ', + ' ' => ' ', + ' ' => ' ', + ' ' => ' ', + '‌' => '‌', + '‍' => '‍', + '‎' => '‎', + '‏' => '‏', + '–' => '–', + '—' => '—', + '‘' => '‘', + '’' => '’', + '‚' => '‚', + '“' => '“', + '”' => '”', + '„' => '„', + '†' => '†', + '‡' => '‡', + '•' => '•', + '…' => '…', + '‰' => '‰', + '′' => '′', + '″' => '″', + '‹' => '‹', + '›' => '›', + '‾' => '‾', + '⁄' => '⁄', + '€' => '€', + 'ℑ' => 'ℑ', + '℘' => '℘', + 'ℜ' => 'ℜ', + '™' => '™', + 'ℵ' => 'ℵ', + '↵' => '↵', + '⇐' => '⇐', + '⇑' => '⇑', + '⇒' => '⇒', + '⇓' => '⇓', + '⇔' => '⇔', + '∀' => '∀', + '∂' => '∂', + '∃' => '∃', + '∅' => '∅', + '∇' => '∇', + '∈' => '∈', + '∉' => '∉', + '∋' => '∋', + '∏' => '∏', + '∑' => '∑', + '−' => '−', + '∗' => '∗', + '√' => '√', + '∝' => '∝', + '∞' => '∞', + '∠' => '∠', + '∧' => '∧', + '∨' => '∨', + '∩' => '∩', + '∪' => '∪', + '∫' => '∫', + '∴' => '∴', + '∼' => '∼', + '≅' => '≅', + '≈' => '≈', + '≠' => '≠', + '≡' => '≡', + '≤' => '≤', + '≥' => '≥', + '⊂' => '⊂', + '⊃' => '⊃', + '⊄' => '⊄', + '⊆' => '⊆', + '⊇' => '⊇', + '⊕' => '⊕', + '⊗' => '⊗', + '⊥' => '⊥', + '⋅' => '⋅', + '⌈' => '⌈', + '⌉' => '⌉', + '⌊' => '⌊', + '⌋' => '⌋', + '⟨' => '〈', + '⟩' => '〉', + '←' => '←', + '↑' => '↑', + '→' => '→', + '↓' => '↓', + '↔' => '↔', + '◊' => '◊', + '♠' => '♠', + '♣' => '♣', + '♥' => '♥', + '♦' => '♦' + ); + + return str_replace( array_keys($to_ncr), array_values($to_ncr), $text ); +} + +/** + * Formats text for the rich text editor. + * + * The filter 'richedit_pre' is applied here. If $text is empty the filter will + * be applied to an empty string. + * + * @since 2.0.0 + * + * @param string $text The text to be formatted. + * @return string The formatted text after filter is applied. + */ +function wp_richedit_pre($text) { + // Filtering a blank results in an annoying \n + if ( empty($text) ) return apply_filters('richedit_pre', ''); + + $output = convert_chars($text); + $output = wpautop($output); + $output = htmlspecialchars($output, ENT_NOQUOTES, get_option( 'blog_charset' ) ); + + return apply_filters('richedit_pre', $output); +} + +/** + * Formats text for the HTML editor. + * + * Unless $output is empty it will pass through htmlspecialchars before the + * 'htmledit_pre' filter is applied. + * + * @since 2.5.0 + * + * @param string $output The text to be formatted. + * @return string Formatted text after filter applied. + */ +function wp_htmledit_pre($output) { + if ( !empty($output) ) + $output = htmlspecialchars($output, ENT_NOQUOTES, get_option( 'blog_charset' ) ); // convert only < > & + + return apply_filters('htmledit_pre', $output); +} + +/** + * Perform a deep string replace operation to ensure the values in $search are no longer present + * + * Repeats the replacement operation until it no longer replaces anything so as to remove "nested" values + * e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that + * str_replace would return + * + * @since 2.8.1 + * @access private + * + * @param string|array $search The value being searched for, otherwise known as the needle. An array may be used to designate multiple needles. + * @param string $subject The string being searched and replaced on, otherwise known as the haystack. + * @return string The string with the replaced svalues. + */ +function _deep_replace( $search, $subject ) { + $subject = (string) $subject; + + $count = 1; + while ( $count ) { + $subject = str_replace( $search, '', $subject, $count ); + } + + return $subject; +} + +/** + * Escapes data for use in a MySQL query. + * + * Usually you should prepare queries using wpdb::prepare(). + * Sometimes, spot-escaping is required or useful. One example + * is preparing an array for use in an IN clause. + * + * @since 2.8.0 + * @param string|array $data Unescaped data + * @return string|array Escaped data + */ +function esc_sql( $data ) { + global $wpdb; + return $wpdb->_escape( $data ); +} + +/** + * Checks and cleans a URL. + * + * A number of characters are removed from the URL. If the URL is for displaying + * (the default behaviour) ampersands are also replaced. The 'clean_url' filter + * is applied to the returned cleaned URL. + * + * @since 2.8.0 + * @uses wp_kses_bad_protocol() To only permit protocols in the URL set + * via $protocols or the common ones set in the function. + * + * @param string $url The URL to be cleaned. + * @param array $protocols Optional. An array of acceptable protocols. + * Defaults to 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn' if not set. + * @param string $_context Private. Use esc_url_raw() for database usage. + * @return string The cleaned $url after the 'clean_url' filter is applied. + */ +function esc_url( $url, $protocols = null, $_context = 'display' ) { + $original_url = $url; + + if ( '' == $url ) + return $url; + $url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url); + $strip = array('%0d', '%0a', '%0D', '%0A'); + $url = _deep_replace($strip, $url); + $url = str_replace(';//', '://', $url); + /* If the URL doesn't appear to contain a scheme, we + * presume it needs http:// appended (unless a relative + * link starting with /, # or ? or a php file). + */ + if ( strpos($url, ':') === false && ! in_array( $url[0], array( '/', '#', '?' ) ) && + ! preg_match('/^[a-z0-9-]+?\.php/i', $url) ) + $url = 'http://' . $url; + + // Replace ampersands and single quotes only when displaying. + if ( 'display' == $_context ) { + $url = wp_kses_normalize_entities( $url ); + $url = str_replace( '&', '&', $url ); + $url = str_replace( "'", ''', $url ); + } + + if ( '/' === $url[0] ) { + $good_protocol_url = $url; + } else { + if ( ! is_array( $protocols ) ) + $protocols = wp_allowed_protocols(); + $good_protocol_url = wp_kses_bad_protocol( $url, $protocols ); + if ( strtolower( $good_protocol_url ) != strtolower( $url ) ) + return ''; + } + + return apply_filters('clean_url', $good_protocol_url, $original_url, $_context); +} + +/** + * Performs esc_url() for database usage. + * + * @since 2.8.0 + * @uses esc_url() + * + * @param string $url The URL to be cleaned. + * @param array $protocols An array of acceptable protocols. + * @return string The cleaned URL. + */ +function esc_url_raw( $url, $protocols = null ) { + return esc_url( $url, $protocols, 'db' ); +} + +/** + * Convert entities, while preserving already-encoded entities. + * + * @link http://www.php.net/htmlentities Borrowed from the PHP Manual user notes. + * + * @since 1.2.2 + * + * @param string $myHTML The text to be converted. + * @return string Converted text. + */ +function htmlentities2($myHTML) { + $translation_table = get_html_translation_table( HTML_ENTITIES, ENT_QUOTES ); + $translation_table[chr(38)] = '&'; + return preg_replace( "/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,3};)/", "&", strtr($myHTML, $translation_table) ); +} + +/** + * Escape single quotes, htmlspecialchar " < > &, and fix line endings. + * + * Escapes text strings for echoing in JS. It is intended to be used for inline JS + * (in a tag attribute, for example onclick="..."). Note that the strings have to + * be in single quotes. The filter 'js_escape' is also applied here. + * + * @since 2.8.0 + * + * @param string $text The text to be escaped. + * @return string Escaped text. + */ +function esc_js( $text ) { + $safe_text = wp_check_invalid_utf8( $text ); + $safe_text = _wp_specialchars( $safe_text, ENT_COMPAT ); + $safe_text = preg_replace( '/&#(x)?0*(?(1)27|39);?/i', "'", stripslashes( $safe_text ) ); + $safe_text = str_replace( "\r", '', $safe_text ); + $safe_text = str_replace( "\n", '\\n', addslashes( $safe_text ) ); + return apply_filters( 'js_escape', $safe_text, $text ); +} + +/** + * Escaping for HTML blocks. + * + * @since 2.8.0 + * + * @param string $text + * @return string + */ +function esc_html( $text ) { + $safe_text = wp_check_invalid_utf8( $text ); + $safe_text = _wp_specialchars( $safe_text, ENT_QUOTES ); + return apply_filters( 'esc_html', $safe_text, $text ); +} + +/** + * Escaping for HTML attributes. + * + * @since 2.8.0 + * + * @param string $text + * @return string + */ +function esc_attr( $text ) { + $safe_text = wp_check_invalid_utf8( $text ); + $safe_text = _wp_specialchars( $safe_text, ENT_QUOTES ); + return apply_filters( 'attribute_escape', $safe_text, $text ); +} + +/** + * Escaping for textarea values. + * + * @since 3.1.0 + * + * @param string $text + * @return string + */ +function esc_textarea( $text ) { + $safe_text = htmlspecialchars( $text, ENT_QUOTES, get_option( 'blog_charset' ) ); + return apply_filters( 'esc_textarea', $safe_text, $text ); +} + +/** + * Escape an HTML tag name. + * + * @since 2.5.0 + * + * @param string $tag_name + * @return string + */ +function tag_escape($tag_name) { + $safe_tag = strtolower( preg_replace('/[^a-zA-Z0-9_:]/', '', $tag_name) ); + return apply_filters('tag_escape', $safe_tag, $tag_name); +} + +/** + * Escapes text for SQL LIKE special characters % and _. + * + * @since 2.5.0 + * + * @param string $text The text to be escaped. + * @return string text, safe for inclusion in LIKE query. + */ +function like_escape($text) { + return str_replace(array("%", "_"), array("\\%", "\\_"), $text); +} + +/** + * Convert full URL paths to absolute paths. + * + * Removes the http or https protocols and the domain. Keeps the path '/' at the + * beginning, so it isn't a true relative link, but from the web root base. + * + * @since 2.1.0 + * + * @param string $link Full URL path. + * @return string Absolute path. + */ +function wp_make_link_relative( $link ) { + return preg_replace( '|https?://[^/]+(/.*)|i', '$1', $link ); +} + +/** + * Sanitises various option values based on the nature of the option. + * + * This is basically a switch statement which will pass $value through a number + * of functions depending on the $option. + * + * @since 2.0.5 + * + * @param string $option The name of the option. + * @param string $value The unsanitised value. + * @return string Sanitized value. + */ +function sanitize_option($option, $value) { + + switch ( $option ) { + case 'admin_email' : + case 'new_admin_email' : + $value = sanitize_email( $value ); + if ( ! is_email( $value ) ) { + $value = get_option( $option ); // Resets option to stored value in the case of failed sanitization + if ( function_exists( 'add_settings_error' ) ) + add_settings_error( $option, 'invalid_admin_email', __( 'The email address entered did not appear to be a valid email address. Please enter a valid email address.' ) ); + } + break; + + case 'thumbnail_size_w': + case 'thumbnail_size_h': + case 'medium_size_w': + case 'medium_size_h': + case 'large_size_w': + case 'large_size_h': + case 'mailserver_port': + case 'comment_max_links': + case 'page_on_front': + case 'page_for_posts': + case 'rss_excerpt_length': + case 'default_category': + case 'default_email_category': + case 'default_link_category': + case 'close_comments_days_old': + case 'comments_per_page': + case 'thread_comments_depth': + case 'users_can_register': + case 'start_of_week': + $value = absint( $value ); + break; + + case 'posts_per_page': + case 'posts_per_rss': + $value = (int) $value; + if ( empty($value) ) + $value = 1; + if ( $value < -1 ) + $value = abs($value); + break; + + case 'default_ping_status': + case 'default_comment_status': + // Options that if not there have 0 value but need to be something like "closed" + if ( $value == '0' || $value == '') + $value = 'closed'; + break; + + case 'blogdescription': + case 'blogname': + $value = wp_kses_post( $value ); + $value = esc_html( $value ); + break; + + case 'blog_charset': + $value = preg_replace('/[^a-zA-Z0-9_-]/', '', $value); // strips slashes + break; + + case 'blog_public': + // This is the value if the settings checkbox is not checked on POST. Don't rely on this. + if ( null === $value ) + $value = 1; + else + $value = intval( $value ); + break; + + case 'date_format': + case 'time_format': + case 'mailserver_url': + case 'mailserver_login': + case 'mailserver_pass': + case 'upload_path': + $value = strip_tags( $value ); + $value = wp_kses_data( $value ); + break; + + case 'ping_sites': + $value = explode( "\n", $value ); + $value = array_filter( array_map( 'trim', $value ) ); + $value = array_filter( array_map( 'esc_url_raw', $value ) ); + $value = implode( "\n", $value ); + break; + + case 'gmt_offset': + $value = preg_replace('/[^0-9:.-]/', '', $value); // strips slashes + break; + + case 'siteurl': + if ( (bool)preg_match( '#http(s?)://(.+)#i', $value) ) { + $value = esc_url_raw($value); + } else { + $value = get_option( $option ); // Resets option to stored value in the case of failed sanitization + if ( function_exists('add_settings_error') ) + add_settings_error('siteurl', 'invalid_siteurl', __('The WordPress address you entered did not appear to be a valid URL. Please enter a valid URL.')); + } + break; + + case 'home': + if ( (bool)preg_match( '#http(s?)://(.+)#i', $value) ) { + $value = esc_url_raw($value); + } else { + $value = get_option( $option ); // Resets option to stored value in the case of failed sanitization + if ( function_exists('add_settings_error') ) + add_settings_error('home', 'invalid_home', __('The Site address you entered did not appear to be a valid URL. Please enter a valid URL.')); + } + break; + + case 'WPLANG': + $allowed = get_available_languages(); + if ( ! in_array( $value, $allowed ) && ! empty( $value ) ) + $value = get_option( $option ); + break; + + case 'illegal_names': + if ( ! is_array( $value ) ) + $value = explode( ' ', $value ); + + $value = array_values( array_filter( array_map( 'trim', $value ) ) ); + + if ( ! $value ) + $value = ''; + break; + + case 'limited_email_domains': + case 'banned_email_domains': + if ( ! is_array( $value ) ) + $value = explode( "\n", $value ); + + $domains = array_values( array_filter( array_map( 'trim', $value ) ) ); + $value = array(); + + foreach ( $domains as $domain ) { + if ( ! preg_match( '/(--|\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) ) + $value[] = $domain; + } + if ( ! $value ) + $value = ''; + break; + + case 'timezone_string': + $allowed_zones = timezone_identifiers_list(); + if ( ! in_array( $value, $allowed_zones ) && ! empty( $value ) ) { + $value = get_option( $option ); // Resets option to stored value in the case of failed sanitization + if ( function_exists('add_settings_error') ) + add_settings_error('timezone_string', 'invalid_timezone_string', __('The timezone you have entered is not valid. Please select a valid timezone.') ); + } + break; + + case 'permalink_structure': + case 'category_base': + case 'tag_base': + $value = esc_url_raw( $value ); + $value = str_replace( 'http://', '', $value ); + break; + + case 'default_role' : + if ( ! get_role( $value ) && get_role( 'subscriber' ) ) + $value = 'subscriber'; + break; + } + + $value = apply_filters("sanitize_option_{$option}", $value, $option); + + return $value; +} + +/** + * Parses a string into variables to be stored in an array. + * + * Uses {@link http://www.php.net/parse_str parse_str()} and stripslashes if + * {@link http://www.php.net/magic_quotes magic_quotes_gpc} is on. + * + * @since 2.2.1 + * @uses apply_filters() for the 'wp_parse_str' filter. + * + * @param string $string The string to be parsed. + * @param array $array Variables will be stored in this array. + */ +function wp_parse_str( $string, &$array ) { + parse_str( $string, $array ); + if ( get_magic_quotes_gpc() ) + $array = stripslashes_deep( $array ); + $array = apply_filters( 'wp_parse_str', $array ); +} + +/** + * Convert lone less than signs. + * + * KSES already converts lone greater than signs. + * + * @uses wp_pre_kses_less_than_callback in the callback function. + * @since 2.3.0 + * + * @param string $text Text to be converted. + * @return string Converted text. + */ +function wp_pre_kses_less_than( $text ) { + return preg_replace_callback('%<[^>]*?((?=<)|>|$)%', 'wp_pre_kses_less_than_callback', $text); +} + +/** + * Callback function used by preg_replace. + * + * @uses esc_html to format the $matches text. + * @since 2.3.0 + * + * @param array $matches Populated by matches to preg_replace. + * @return string The text returned after esc_html if needed. + */ +function wp_pre_kses_less_than_callback( $matches ) { + if ( false === strpos($matches[0], '>') ) + return esc_html($matches[0]); + return $matches[0]; +} + +/** + * WordPress implementation of PHP sprintf() with filters. + * + * @since 2.5.0 + * @link http://www.php.net/sprintf + * + * @param string $pattern The string which formatted args are inserted. + * @param mixed $args,... Arguments to be formatted into the $pattern string. + * @return string The formatted string. + */ +function wp_sprintf( $pattern ) { + $args = func_get_args(); + $len = strlen($pattern); + $start = 0; + $result = ''; + $arg_index = 0; + while ( $len > $start ) { + // Last character: append and break + if ( strlen($pattern) - 1 == $start ) { + $result .= substr($pattern, -1); + break; + } + + // Literal %: append and continue + if ( substr($pattern, $start, 2) == '%%' ) { + $start += 2; + $result .= '%'; + continue; + } + + // Get fragment before next % + $end = strpos($pattern, '%', $start + 1); + if ( false === $end ) + $end = $len; + $fragment = substr($pattern, $start, $end - $start); + + // Fragment has a specifier + if ( $pattern[$start] == '%' ) { + // Find numbered arguments or take the next one in order + if ( preg_match('/^%(\d+)\$/', $fragment, $matches) ) { + $arg = isset($args[$matches[1]]) ? $args[$matches[1]] : ''; + $fragment = str_replace("%{$matches[1]}$", '%', $fragment); + } else { + ++$arg_index; + $arg = isset($args[$arg_index]) ? $args[$arg_index] : ''; + } + + // Apply filters OR sprintf + $_fragment = apply_filters( 'wp_sprintf', $fragment, $arg ); + if ( $_fragment != $fragment ) + $fragment = $_fragment; + else + $fragment = sprintf($fragment, strval($arg) ); + } + + // Append to result and move to next fragment + $result .= $fragment; + $start = $end; + } + return $result; +} + +/** + * Localize list items before the rest of the content. + * + * The '%l' must be at the first characters can then contain the rest of the + * content. The list items will have ', ', ', and', and ' and ' added depending + * on the amount of list items in the $args parameter. + * + * @since 2.5.0 + * + * @param string $pattern Content containing '%l' at the beginning. + * @param array $args List items to prepend to the content and replace '%l'. + * @return string Localized list items and rest of the content. + */ +function wp_sprintf_l($pattern, $args) { + // Not a match + if ( substr($pattern, 0, 2) != '%l' ) + return $pattern; + + // Nothing to work with + if ( empty($args) ) + return ''; + + // Translate and filter the delimiter set (avoid ampersands and entities here) + $l = apply_filters('wp_sprintf_l', array( + /* translators: used between list items, there is a space after the comma */ + 'between' => __(', '), + /* translators: used between list items, there is a space after the and */ + 'between_last_two' => __(', and '), + /* translators: used between only two list items, there is a space after the and */ + 'between_only_two' => __(' and '), + )); + + $args = (array) $args; + $result = array_shift($args); + if ( count($args) == 1 ) + $result .= $l['between_only_two'] . array_shift($args); + // Loop when more than two args + $i = count($args); + while ( $i ) { + $arg = array_shift($args); + $i--; + if ( 0 == $i ) + $result .= $l['between_last_two'] . $arg; + else + $result .= $l['between'] . $arg; + } + return $result . substr($pattern, 2); +} + +/** + * Safely extracts not more than the first $count characters from html string. + * + * UTF-8, tags and entities safe prefix extraction. Entities inside will *NOT* + * be counted as one character. For example & will be counted as 4, < as + * 3, etc. + * + * @since 2.5.0 + * + * @param string $str String to get the excerpt from. + * @param integer $count Maximum number of characters to take. + * @param string $more Optional. What to append if $str needs to be trimmed. Defaults to empty string. + * @return string The excerpt. + */ +function wp_html_excerpt( $str, $count, $more = null ) { + if ( null === $more ) + $more = ''; + $str = wp_strip_all_tags( $str, true ); + $excerpt = mb_substr( $str, 0, $count ); + // remove part of an entity at the end + $excerpt = preg_replace( '/&[^;\s]{0,6}$/', '', $excerpt ); + if ( $str != $excerpt ) + $excerpt = trim( $excerpt ) . $more; + return $excerpt; +} + +/** + * Add a Base url to relative links in passed content. + * + * By default it supports the 'src' and 'href' attributes. However this can be + * changed via the 3rd param. + * + * @since 2.7.0 + * + * @param string $content String to search for links in. + * @param string $base The base URL to prefix to links. + * @param array $attrs The attributes which should be processed. + * @return string The processed content. + */ +function links_add_base_url( $content, $base, $attrs = array('src', 'href') ) { + global $_links_add_base; + $_links_add_base = $base; + $attrs = implode('|', (array)$attrs); + return preg_replace_callback( "!($attrs)=(['\"])(.+?)\\2!i", '_links_add_base', $content ); +} + +/** + * Callback to add a base url to relative links in passed content. + * + * @since 2.7.0 + * @access private + * + * @param string $m The matched link. + * @return string The processed link. + */ +function _links_add_base($m) { + global $_links_add_base; + //1 = attribute name 2 = quotation mark 3 = URL + return $m[1] . '=' . $m[2] . + ( preg_match( '#^(\w{1,20}):#', $m[3], $protocol ) && in_array( $protocol[1], wp_allowed_protocols() ) ? + $m[3] : + path_join( $_links_add_base, $m[3] ) ) + . $m[2]; +} + +/** + * Adds a Target attribute to all links in passed content. + * + * This function by default only applies to <a> tags, however this can be + * modified by the 3rd param. + * + * NOTE: Any current target attributed will be stripped and replaced. + * + * @since 2.7.0 + * + * @param string $content String to search for links in. + * @param string $target The Target to add to the links. + * @param array $tags An array of tags to apply to. + * @return string The processed content. + */ +function links_add_target( $content, $target = '_blank', $tags = array('a') ) { + global $_links_add_target; + $_links_add_target = $target; + $tags = implode('|', (array)$tags); + return preg_replace_callback( "!<($tags)(.+?)>!i", '_links_add_target', $content ); +} + +/** + * Callback to add a target attribute to all links in passed content. + * + * @since 2.7.0 + * @access private + * + * @param string $m The matched link. + * @return string The processed link. + */ +function _links_add_target( $m ) { + global $_links_add_target; + $tag = $m[1]; + $link = preg_replace('|(target=([\'"])(.*?)\2)|i', '', $m[2]); + return '<' . $tag . $link . ' target="' . esc_attr( $_links_add_target ) . '">'; +} + +/** + * Normalize EOL characters and strip duplicate whitespace. + * + * @since 2.7.0 + * + * @param string $str The string to normalize. + * @return string The normalized string. + */ +function normalize_whitespace( $str ) { + $str = trim( $str ); + $str = str_replace( "\r", "\n", $str ); + $str = preg_replace( array( '/\n+/', '/[ \t]+/' ), array( "\n", ' ' ), $str ); + return $str; +} + +/** + * Properly strip all HTML tags including script and style + * + * @since 2.9.0 + * + * @param string $string String containing HTML tags + * @param bool $remove_breaks optional Whether to remove left over line breaks and white space chars + * @return string The processed string. + */ +function wp_strip_all_tags($string, $remove_breaks = false) { + $string = preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $string ); + $string = strip_tags($string); + + if ( $remove_breaks ) + $string = preg_replace('/[\r\n\t ]+/', ' ', $string); + + return trim( $string ); +} + +/** + * Sanitize a string from user input or from the db + * + * check for invalid UTF-8, + * Convert single < characters to entity, + * strip all tags, + * remove line breaks, tabs and extra white space, + * strip octets. + * + * @since 2.9.0 + * + * @param string $str + * @return string + */ +function sanitize_text_field($str) { + $filtered = wp_check_invalid_utf8( $str ); + + if ( strpos($filtered, '<') !== false ) { + $filtered = wp_pre_kses_less_than( $filtered ); + // This will strip extra whitespace for us. + $filtered = wp_strip_all_tags( $filtered, true ); + } else { + $filtered = trim( preg_replace('/[\r\n\t ]+/', ' ', $filtered) ); + } + + $found = false; + while ( preg_match('/%[a-f0-9]{2}/i', $filtered, $match) ) { + $filtered = str_replace($match[0], '', $filtered); + $found = true; + } + + if ( $found ) { + // Strip out the whitespace that may now exist after removing the octets. + $filtered = trim( preg_replace('/ +/', ' ', $filtered) ); + } + + return apply_filters('sanitize_text_field', $filtered, $str); +} + +/** + * i18n friendly version of basename() + * + * @since 3.1.0 + * + * @param string $path A path. + * @param string $suffix If the filename ends in suffix this will also be cut off. + * @return string + */ +function wp_basename( $path, $suffix = '' ) { + return urldecode( basename( str_replace( array( '%2F', '%5C' ), '/', urlencode( $path ) ), $suffix ) ); +} + +/** + * Forever eliminate "Wordpress" from the planet (or at least the little bit we can influence). + * + * Violating our coding standards for a good function name. + * + * @since 3.0.0 + */ +function capital_P_dangit( $text ) { + // Simple replacement for titles + if ( 'the_title' === current_filter() ) + return str_replace( 'Wordpress', 'WordPress', $text ); + // Still here? Use the more judicious replacement + static $dblq = false; + if ( false === $dblq ) + $dblq = _x( '“', 'opening curly double quote' ); + return str_replace( + array( ' Wordpress', '‘Wordpress', $dblq . 'Wordpress', '>Wordpress', '(Wordpress' ), + array( ' WordPress', '‘WordPress', $dblq . 'WordPress', '>WordPress', '(WordPress' ), + $text ); + +} + +/** + * Sanitize a mime type + * + * @since 3.1.3 + * + * @param string $mime_type Mime type + * @return string Sanitized mime type + */ +function sanitize_mime_type( $mime_type ) { + $sani_mime_type = preg_replace( '/[^-+*.a-zA-Z0-9\/]/', '', $mime_type ); + return apply_filters( 'sanitize_mime_type', $sani_mime_type, $mime_type ); +} + +/** + * Sanitize space or carriage return separated URLs that are used to send trackbacks. + * + * @since 3.4.0 + * + * @param string $to_ping Space or carriage return separated URLs + * @return string URLs starting with the http or https protocol, separated by a carriage return. + */ +function sanitize_trackback_urls( $to_ping ) { + $urls_to_ping = preg_split( '/[\r\n\t ]/', trim( $to_ping ), -1, PREG_SPLIT_NO_EMPTY ); + foreach ( $urls_to_ping as $k => $url ) { + if ( !preg_match( '#^https?://.#i', $url ) ) + unset( $urls_to_ping[$k] ); + } + $urls_to_ping = array_map( 'esc_url_raw', $urls_to_ping ); + $urls_to_ping = implode( "\n", $urls_to_ping ); + return apply_filters( 'sanitize_trackback_urls', $urls_to_ping, $to_ping ); +} + +/** + * Add slashes to a string or array of strings. + * + * This should be used when preparing data for core API that expects slashed data. + * This should not be used to escape data going directly into an SQL query. + * + * @since 3.6.0 + * + * @param string|array $value String or array of strings to slash. + * @return string|array Slashed $value + */ +function wp_slash( $value ) { + if ( is_array( $value ) ) { + foreach ( $value as $k => $v ) { + if ( is_array( $v ) ) { + $value[$k] = wp_slash( $v ); + } else { + $value[$k] = addslashes( $v ); + } + } + } else { + $value = addslashes( $value ); + } + + return $value; +} + +/** + * Remove slashes from a string or array of strings. + * + * This should be used to remove slashes from data passed to core API that + * expects data to be unslashed. + * + * @since 3.6.0 + * + * @param string|array $value String or array of strings to unslash. + * @return string|array Unslashed $value + */ +function wp_unslash( $value ) { + return stripslashes_deep( $value ); +} + +/** + * Extract and return the first URL from passed content. + * + * @since 3.6.0 + * + * @param string $content A string which might contain a URL. + * @return string The found URL. + */ +function get_url_in_content( $content ) { + if ( empty( $content ) ) + return ''; + + if ( preg_match( '/<a\s[^>]*?href=([\'"])(.+?)\1/is', $content, $matches ) ) + return esc_url

diff -r 000000000000 -r d970ebf37754 wp/wp-includes/formatting.php --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/wp/wp-includes/formatting.php Wed Nov 06 03:21:17 2013 +0000 @@ -0,0 +1,3433 @@ + + * 'cause today's effort makes it worth tomorrow's "holiday"... + * + * Becomes: + *


+ * ’cause today’s effort makes it worth tomorrow’s “holiday”…
+ *

+ * Code within certain html blocks are skipped. + * + * @since 0.71 + * @uses $wp_cockneyreplace Array of formatted entities for certain common phrases + * + * @param string $text The text to be formatted + * @return string The string replaced with html entities + */ +function wptexturize($text) { + global $wp_cockneyreplace; + static $static_characters, $static_replacements, $dynamic_characters, $dynamic_replacements, + $default_no_texturize_tags, $default_no_texturize_shortcodes; + + // No need to set up these static variables more than once + if ( ! isset( $static_characters ) ) { + /* translators: opening curly double quote */ + $opening_quote = _x( '“', 'opening curly double quote' ); + /* translators: closing curly double quote */ + $closing_quote = _x( '”', 'closing curly double quote' ); + + /* translators: apostrophe, for example in 'cause or can't */ + $apos = _x( '’', 'apostrophe' ); + + /* translators: prime, for example in 9' (nine feet) */ + $prime = _x( '′', 'prime' ); + /* translators: double prime, for example in 9" (nine inches) */ + $double_prime = _x( '″', 'double prime' ); + + /* translators: opening curly single quote */ + $opening_single_quote = _x( '‘', 'opening curly single quote' ); + /* translators: closing curly single quote */ + $closing_single_quote = _x( '’', 'closing curly single quote' ); + + /* translators: en dash */ + $en_dash = _x( '–', 'en dash' ); + /* translators: em dash */ + $em_dash = _x( '—', 'em dash' ); + + $default_no_texturize_tags = array('pre', 'code', 'kbd', 'style', 'script', 'tt'); + $default_no_texturize_shortcodes = array('code'); + + // if a plugin has provided an autocorrect array, use it + if ( isset($wp_cockneyreplace) ) { + $cockney = array_keys($wp_cockneyreplace); + $cockneyreplace = array_values($wp_cockneyreplace); + } elseif ( "'" != $apos ) { // Only bother if we're doing a replacement. + $cockney = array( "'tain't", "'twere", "'twas", "'tis", "'twill", "'til", "'bout", "'nuff", "'round", "'cause" ); + $cockneyreplace = array( $apos . "tain" . $apos . "t", $apos . "twere", $apos . "twas", $apos . "tis", $apos . "twill", $apos . "til", $apos . "bout", $apos . "nuff", $apos . "round", $apos . "cause" ); + } else { + $cockney = $cockneyreplace = array(); + } + + $static_characters = array_merge( array( '---', ' -- ', '--', ' - ', 'xn–', '...', '``', '\'\'', ' (tm)' ), $cockney ); + $static_replacements = array_merge( array( $em_dash, ' ' . $em_dash . ' ', $en_dash, ' ' . $en_dash . ' ', 'xn--', '…', $opening_quote, $closing_quote, ' ™' ), $cockneyreplace ); + + $dynamic = array(); + if ( "'" != $apos ) { + $dynamic[ '/\'(\d\d(?:’|\')?s)/' ] = $apos . '$1'; // '99's + $dynamic[ '/\'(\d)/' ] = $apos . '$1'; // '99 + } + if ( "'" != $opening_single_quote ) + $dynamic[ '/(\s|\A|[([{<]|")\'/' ] = '$1' . $opening_single_quote; // opening single quote, even after (, {, <, [ + if ( '"' != $double_prime ) + $dynamic[ '/(\d)"/' ] = '$1' . $double_prime; // 9" (double prime) + if ( "'" != $prime ) + $dynamic[ '/(\d)\'/' ] = '$1' . $prime; // 9' (prime) + if ( "'" != $apos ) + $dynamic[ '/(\S)\'([^\'\s])/' ] = '$1' . $apos . '$2'; // apostrophe in a word + if ( '"' != $opening_quote ) + $dynamic[ '/(\s|\A|[([{<])"(?!\s)/' ] = '$1' . $opening_quote . '$2'; // opening double quote, even after (, {, <, [ + if ( '"' != $closing_quote ) + $dynamic[ '/"(\s|\S|\Z)/' ] = $closing_quote . '$1'; // closing double quote + if ( "'" != $closing_single_quote ) + $dynamic[ '/\'([\s.]|\Z)/' ] = $closing_single_quote . '$1'; // closing single quote + + $dynamic[ '/\b(\d+)x(\d+)\b/' ] = '$1×$2'; // 9x9 (times) + + $dynamic_characters = array_keys( $dynamic ); + $dynamic_replacements = array_values( $dynamic ); + } + + // Transform into regexp sub-expression used in _wptexturize_pushpop_element + // Must do this every time in case plugins use these filters in a context sensitive manner + $no_texturize_tags = '(' . implode('|', apply_filters('no_texturize_tags', $default_no_texturize_tags) ) . ')'; + $no_texturize_shortcodes = '(' . implode('|', apply_filters('no_texturize_shortcodes', $default_no_texturize_shortcodes) ) . ')'; + + $no_texturize_tags_stack = array(); + $no_texturize_shortcodes_stack = array(); + + $textarr = preg_split('/(<.*>|\[.*\])/Us', $text, -1, PREG_SPLIT_DELIM_CAPTURE); + + foreach ( $textarr as &$curl ) { + if ( empty( $curl ) ) + continue; + + // Only call _wptexturize_pushpop_element if first char is correct tag opening + $first = $curl[0]; + if ( '<' === $first ) { + _wptexturize_pushpop_element($curl, $no_texturize_tags_stack, $no_texturize_tags, '<', '>'); + } elseif ( '[' === $first ) { + _wptexturize_pushpop_element($curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes, '[', ']'); + } elseif ( empty($no_texturize_shortcodes_stack) && empty($no_texturize_tags_stack) ) { + // This is not a tag, nor is the texturization disabled static strings + $curl = str_replace($static_characters, $static_replacements, $curl); + // regular expressions + $curl = preg_replace($dynamic_characters, $dynamic_replacements, $curl); + } + $curl = preg_replace('/&([^#])(?![a-zA-Z1-4]{1,8};)/', '&$1', $curl); + } + return implode( '', $textarr ); +} + +/** + * Search for disabled element tags. Push element to stack on tag open and pop + * on tag close. Assumes first character of $text is tag opening. + * + * @since 2.9.0 + * @access private + * + * @param string $text Text to check. First character is assumed to be $opening + * @param array $stack Array used as stack of opened tag elements + * @param string $disabled_elements Tags to match against formatted as regexp sub-expression + * @param string $opening Tag opening character, assumed to be 1 character long + * @param string $closing Tag closing character + */ +function _wptexturize_pushpop_element($text, &$stack, $disabled_elements, $opening = '<', $closing = '>') { + // Check if it is a closing tag -- otherwise assume opening tag + if (strncmp($opening . '/', $text, 2)) { + // Opening? Check $text+1 against disabled elements + if (preg_match('/^' . $disabled_elements . '\b/', substr($text, 1), $matches)) { + /* + * This disables texturize until we find a closing tag of our type + * (e.g.

) even if there was invalid nesting before that
+			 *
+			 * Example: in the case sadsadasd"baba"
+			 *          "baba" won't be texturize
+			 */
+
+			array_push($stack, $matches[1]);
+		}
+	} else {
+		// Closing? Check $text+2 against disabled elements
+		$c = preg_quote($closing, '/');
+		if (preg_match('/^' . $disabled_elements . $c . '/', substr($text, 2), $matches)) {
+			$last = array_pop($stack);
+
+			// Make sure it matches the opening tag
+			if ($last != $matches[1])
+				array_push($stack, $last);
+		}
+	}
+}
+
+/**
+ * Replaces double line-breaks with paragraph elements.
+ *
+ * A group of regex replaces used to identify text formatted with newlines and
+ * replace double line-breaks with HTML paragraph tags. The remaining
+ * line-breaks after conversion become <
> tags, unless $br is set to '0'
+ * or 'false'.
+ *
+ * @since 0.71
+ *
+ * @param string $pee The text which has to be formatted.
+ * @param bool $br Optional. If set, this will convert all remaining line-breaks after paragraphing. Default true.
+ * @return string Text which has been converted into correct paragraph tags.
+ */
+function wpautop($pee, $br = true) {
+	$pre_tags = array();
+
+	if ( trim($pee) === '' )
+		return '';
+
+	$pee = $pee . "\n"; // just to make things a little easier, pad the end
+
+	if ( strpos($pee, '', $pee );
+		$last_pee = array_pop($pee_parts);
+		$pee = '';
+		$i = 0;
+
+		foreach ( $pee_parts as $pee_part ) {
+			$start = strpos($pee_part, '';
+
+			$pee .= substr( $pee_part, 0, $start ) . $name;
+			$i++;
+		}
+
+		$pee .= $last_pee;
+	}
+
+	$pee = preg_replace('|
\s*
|', "\n\n", $pee);
+	// Space things out a little
+	$allblocks = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|option|form|map|area|blockquote|address|math|style|p|h[1-6]|hr|fieldset|noscript|legend|section|article|aside|hgroup|header|footer|nav|figure|figcaption|details|menu|summary)';
+	$pee = preg_replace('!(<' . $allblocks . '[^>]*>)!', "\n$1", $pee);
+	$pee = preg_replace('!()!', "$1\n\n", $pee);
+	$pee = str_replace(array("\r\n", "\r"), "\n", $pee); // cross-platform newlines
+	if ( strpos($pee, ']*)>\s*|', "", $pee); // no pee inside object/embed
+		$pee = preg_replace('|\s*\s*|', '', $pee);
+	}
+	$pee = preg_replace("/\n\n+/", "\n\n", $pee); // take care of duplicates
+	// make paragraphs, including one at the end
+	$pees = preg_split('/\n\s*\n/', $pee, -1, PREG_SPLIT_NO_EMPTY);
+	$pee = '';
+	foreach ( $pees as $tinkle )
+		$pee .= '' . trim($tinkle, "\n") . "\n";
+	$pee = preg_replace('|\s*|', '', $pee); // under certain strange conditions it could create a P of entirely whitespace
+	$pee = preg_replace('!([^<]+)!', "
$1
", $pee);
+	$pee = preg_replace('!\s*(]*>)\s*!', "$1", $pee); // don't pee all over a tag
+	$pee = preg_replace("|(|", "$1", $pee); // problem with nested lists
+	$pee = preg_replace('|
]*)>|i', "
", $pee);
+	$pee = str_replace('
', '', $pee);
+	$pee = preg_replace('!\s*(]*>)!', "$1", $pee);
+	$pee = preg_replace('!(]*>)\s*!', "$1", $pee);
+	if ( $br ) {
+		$pee = preg_replace_callback('/<(script|style).*?<\/\\1>/s', '_autop_newline_preservation_helper', $pee);
+		$pee = preg_replace('|(?)\s*\n|', "
\n", $pee); // optionally make line breaks
+		$pee = str_replace('', "\n", $pee);
+	}
+	$pee = preg_replace('!(]*>)\s*
!', "$1", $pee);
+	$pee = preg_replace('!
(\s*]*>)!', '$1', $pee);
+	$pee = preg_replace( "|\n
$|", '', $pee );
+
+	if ( !empty($pre_tags) )
+		$pee = str_replace(array_keys($pre_tags), array_values($pre_tags), $pee);
+
+	return $pee;
+}
+
+/**
+ * Newline preservation help function for wpautop
+ *
+ * @since 3.1.0
+ * @access private
+ *
+ * @param array $matches preg_replace_callback matches array
+ * @return string
+ */
+function _autop_newline_preservation_helper( $matches ) {
+	return str_replace("\n", "", $matches[0]);
+}
+
+/**
+ * Don't auto-p wrap shortcodes that stand alone
+ *
+ * Ensures that shortcodes are not wrapped in <>...<>.
+ *
+ * @since 2.9.0
+ *
+ * @param string $pee The content.
+ * @return string The filtered content.
+ */
+function shortcode_unautop( $pee ) {
+	global $shortcode_tags;
+
+	if ( empty( $shortcode_tags ) || !is_array( $shortcode_tags ) ) {
+		return $pee;
+	}
+
+	$tagregexp = join( '|', array_map( 'preg_quote', array_keys( $shortcode_tags ) ) );
+
+	$pattern =
+		  '/'
+		. ''                              // Opening paragraph
+		. '\\s*+'                            // Optional leading whitespace
+		. '('                                // 1: The shortcode
+		.     '\\['                          // Opening bracket
+		.     "($tagregexp)"                 // 2: Shortcode name
+		.     '(?![\\w-])'                   // Not followed by word character or hyphen
+		                                     // Unroll the loop: Inside the opening shortcode tag
+		.     '[^\\]\\/]*'                   // Not a closing bracket or forward slash
+		.     '(?:'
+		.         '\\/(?!\\])'               // A forward slash not followed by a closing bracket
+		.         '[^\\]\\/]*'               // Not a closing bracket or forward slash
+		.     ')*?'
+		.     '(?:'
+		.         '\\/\\]'                   // Self closing tag and closing bracket
+		.     '|'
+		.         '\\]'                      // Closing bracket
+		.         '(?:'                      // Unroll the loop: Optionally, anything between the opening and closing shortcode tags
+		.             '[^\\[]*+'             // Not an opening bracket
+		.             '(?:'
+		.                 '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag
+		.                 '[^\\[]*+'         // Not an opening bracket
+		.             ')*+'
+		.             '\\[\\/\\2\\]'         // Closing shortcode tag
+		.         ')?'
+		.     ')'
+		. ')'
+		. '\\s*+'                            // optional trailing whitespace
+		. '<\\/p>'                           // closing paragraph
+		. '/s';
+
+	return preg_replace( $pattern, '$1', $pee );
+}
+
+/**
+ * Checks to see if a string is utf8 encoded.
+ *
+ * NOTE: This function checks for 5-Byte sequences, UTF8
+ *       has Bytes Sequences with a maximum length of 4.
+ *
+ * @author bmorel at ssi dot fr (modified)
+ * @since 1.2.1
+ *
+ * @param string $str The string to be checked
+ * @return bool True if $str fits a UTF-8 model, false otherwise.
+ */
+function seems_utf8($str) {
+	$length = strlen($str);
+	for ($i=0; $i < $length; $i++) {
+		$c = ord($str[$i]);
+		if ($c < 0x80) $n = 0; # 0bbbbbbb
+		elseif (($c & 0xE0) == 0xC0) $n=1; # 110bbbbb
+		elseif (($c & 0xF0) == 0xE0) $n=2; # 1110bbbb
+		elseif (($c & 0xF8) == 0xF0) $n=3; # 11110bbb
+		elseif (($c & 0xFC) == 0xF8) $n=4; # 111110bb
+		elseif (($c & 0xFE) == 0xFC) $n=5; # 1111110b
+		else return false; # Does not match any model
+		for ($j=0; $j<$n; $j++) { # n bytes matching 10bbbbbb follow ?
+			if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80))
+				return false;
+		}
+	}
+	return true;
+}
+
+/**
+ * Converts a number of special characters into their HTML entities.
+ *
+ * Specifically deals with: &, <, >, ", and '.
+ *
+ * $quote_style can be set to ENT_COMPAT to encode " to
+ * ", or ENT_QUOTES to do both. Default is ENT_NOQUOTES where no quotes are encoded.
+ *
+ * @since 1.2.2
+ * @access private
+ *
+ * @param string $string The text which is to be encoded.
+ * @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.
+ * @param string $charset Optional. The character encoding of the string. Default is false.
+ * @param boolean $double_encode Optional. Whether to encode existing html entities. Default is false.
+ * @return string The encoded text with HTML entities.
+ */
+function _wp_specialchars( $string, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) {
+	$string = (string) $string;
+
+	if ( 0 === strlen( $string ) )
+		return '';
+
+	// Don't bother if there are no specialchars - saves some processing
+	if ( ! preg_match( '/[&<>"\']/', $string ) )
+		return $string;
+
+	// Account for the previous behaviour of the function when the $quote_style is not an accepted value
+	if ( empty( $quote_style ) )
+		$quote_style = ENT_NOQUOTES;
+	elseif ( ! in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) )
+		$quote_style = ENT_QUOTES;
+
+	// Store the site charset as a static to avoid multiple calls to wp_load_alloptions()
+	if ( ! $charset ) {
+		static $_charset;
+		if ( ! isset( $_charset ) ) {
+			$alloptions = wp_load_alloptions();
+			$_charset = isset( $alloptions['blog_charset'] ) ? $alloptions['blog_charset'] : '';
+		}
+		$charset = $_charset;
+	}
+
+	if ( in_array( $charset, array( 'utf8', 'utf-8', 'UTF8' ) ) )
+		$charset = 'UTF-8';
+
+	$_quote_style = $quote_style;
+
+	if ( $quote_style === 'double' ) {
+		$quote_style = ENT_COMPAT;
+		$_quote_style = ENT_COMPAT;
+	} elseif ( $quote_style === 'single' ) {
+		$quote_style = ENT_NOQUOTES;
+	}
+
+	// Handle double encoding ourselves
+	if ( $double_encode ) {
+		$string = @htmlspecialchars( $string, $quote_style, $charset );
+	} else {
+		// Decode & into &
+		$string = wp_specialchars_decode( $string, $_quote_style );
+
+		// Guarantee every &entity; is valid or re-encode the &
+		$string = wp_kses_normalize_entities( $string );
+
+		// Now re-encode everything except &entity;
+		$string = preg_split( '/(&#?x?[0-9a-z]+;)/i', $string, -1, PREG_SPLIT_DELIM_CAPTURE );
+
+		for ( $i = 0; $i < count( $string ); $i += 2 )
+			$string[$i] = @htmlspecialchars( $string[$i], $quote_style, $charset );
+
+		$string = implode( '', $string );
+	}
+
+	// Backwards compatibility
+	if ( 'single' === $_quote_style )
+		$string = str_replace( "'", ''', $string );
+
+	return $string;
+}
+
+/**
+ * Converts a number of HTML entities into their special characters.
+ *
+ * Specifically deals with: &, <, >, ", and '.
+ *
+ * $quote_style can be set to ENT_COMPAT to decode " entities,
+ * or ENT_QUOTES to do both " and '. Default is ENT_NOQUOTES where no quotes are decoded.
+ *
+ * @since 2.8.0
+ *
+ * @param string $string The text which is to be decoded.
+ * @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old _wp_specialchars() values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.
+ * @return string The decoded text without HTML entities.
+ */
+function wp_specialchars_decode( $string, $quote_style = ENT_NOQUOTES ) {
+	$string = (string) $string;
+
+	if ( 0 === strlen( $string ) ) {
+		return '';
+	}
+
+	// Don't bother if there are no entities - saves a lot of processing
+	if ( strpos( $string, '&' ) === false ) {
+		return $string;
+	}
+
+	// Match the previous behaviour of _wp_specialchars() when the $quote_style is not an accepted value
+	if ( empty( $quote_style ) ) {
+		$quote_style = ENT_NOQUOTES;
+	} elseif ( !in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) ) {
+		$quote_style = ENT_QUOTES;
+	}
+
+	// More complete than get_html_translation_table( HTML_SPECIALCHARS )
+	$single = array( '''  => '\'', ''' => '\'' );
+	$single_preg = array( '/�*39;/'  => ''', '/�*27;/i' => ''' );
+	$double = array( '"' => '"', '"'  => '"', '"' => '"' );
+	$double_preg = array( '/�*34;/'  => '"', '/�*22;/i' => '"' );
+	$others = array( '<'   => '<', '<'  => '<', '>'   => '>', '>'  => '>', '&'  => '&', '&'  => '&', '&' => '&' );
+	$others_preg = array( '/�*60;/'  => '<', '/�*62;/'  => '>', '/�*38;/'  => '&', '/�*26;/i' => '&' );
+
+	if ( $quote_style === ENT_QUOTES ) {
+		$translation = array_merge( $single, $double, $others );
+		$translation_preg = array_merge( $single_preg, $double_preg, $others_preg );
+	} elseif ( $quote_style === ENT_COMPAT || $quote_style === 'double' ) {
+		$translation = array_merge( $double, $others );
+		$translation_preg = array_merge( $double_preg, $others_preg );
+	} elseif ( $quote_style === 'single' ) {
+		$translation = array_merge( $single, $others );
+		$translation_preg = array_merge( $single_preg, $others_preg );
+	} elseif ( $quote_style === ENT_NOQUOTES ) {
+		$translation = $others;
+		$translation_preg = $others_preg;
+	}
+
+	// Remove zero padding on numeric entities
+	$string = preg_replace( array_keys( $translation_preg ), array_values( $translation_preg ), $string );
+
+	// Replace characters according to translation table
+	return strtr( $string, $translation );
+}
+
+/**
+ * Checks for invalid UTF8 in a string.
+ *
+ * @since 2.8.0
+ *
+ * @param string $string The text which is to be checked.
+ * @param boolean $strip Optional. Whether to attempt to strip out invalid UTF8. Default is false.
+ * @return string The checked text.
+ */
+function wp_check_invalid_utf8( $string, $strip = false ) {
+	$string = (string) $string;
+
+	if ( 0 === strlen( $string ) ) {
+		return '';
+	}
+
+	// Store the site charset as a static to avoid multiple calls to get_option()
+	static $is_utf8;
+	if ( !isset( $is_utf8 ) ) {
+		$is_utf8 = in_array( get_option( 'blog_charset' ), array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) );
+	}
+	if ( !$is_utf8 ) {
+		return $string;
+	}
+
+	// Check for support for utf8 in the installed PCRE library once and store the result in a static
+	static $utf8_pcre;
+	if ( !isset( $utf8_pcre ) ) {
+		$utf8_pcre = @preg_match( '/^./u', 'a' );
+	}
+	// We can't demand utf8 in the PCRE installation, so just return the string in those cases
+	if ( !$utf8_pcre ) {
+		return $string;
+	}
+
+	// preg_match fails when it encounters invalid UTF8 in $string
+	if ( 1 === @preg_match( '/^./us', $string ) ) {
+		return $string;
+	}
+
+	// Attempt to strip the bad chars if requested (not recommended)
+	if ( $strip && function_exists( 'iconv' ) ) {
+		return iconv( 'utf-8', 'utf-8', $string );
+	}
+
+	return '';
+}
+
+/**
+ * Encode the Unicode values to be used in the URI.
+ *
+ * @since 1.5.0
+ *
+ * @param string $utf8_string
+ * @param int $length Max length of the string
+ * @return string String with Unicode encoded for URI.
+ */
+function utf8_uri_encode( $utf8_string, $length = 0 ) {
+	$unicode = '';
+	$values = array();
+	$num_octets = 1;
+	$unicode_length = 0;
+
+	$string_length = strlen( $utf8_string );
+	for ($i = 0; $i < $string_length; $i++ ) {
+
+		$value = ord( $utf8_string[ $i ] );
+
+		if ( $value < 128 ) {
+			if ( $length && ( $unicode_length >= $length ) )
+				break;
+			$unicode .= chr($value);
+			$unicode_length++;
+		} else {
+			if ( count( $values ) == 0 ) $num_octets = ( $value < 224 ) ? 2 : 3;
+
+			$values[] = $value;
+
+			if ( $length && ( $unicode_length + ($num_octets * 3) ) > $length )
+				break;
+			if ( count( $values ) == $num_octets ) {
+				if ($num_octets == 3) {
+					$unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]) . '%' . dechex($values[2]);
+					$unicode_length += 9;
+				} else {
+					$unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]);
+					$unicode_length += 6;
+				}
+
+				$values = array();
+				$num_octets = 1;
+			}
+		}
+	}
+
+	return $unicode;
+}
+
+/**
+ * Converts all accent characters to ASCII characters.
+ *
+ * If there are no accent characters, then the string given is just returned.
+ *
+ * @since 1.2.1
+ *
+ * @param string $string Text that might have accent characters
+ * @return string Filtered string with replaced "nice" characters.
+ */
+function remove_accents($string) {
+	if ( !preg_match('/[\x80-\xff]/', $string) )
+		return $string;
+
+	if (seems_utf8($string)) {
+		$chars = array(
+		// Decompositions for Latin-1 Supplement
+		chr(194).chr(170) => 'a', chr(194).chr(186) => 'o',
+		chr(195).chr(128) => 'A', chr(195).chr(129) => 'A',
+		chr(195).chr(130) => 'A', chr(195).chr(131) => 'A',
+		chr(195).chr(132) => 'A', chr(195).chr(133) => 'A',
+		chr(195).chr(134) => 'AE',chr(195).chr(135) => 'C',
+		chr(195).chr(136) => 'E', chr(195).chr(137) => 'E',
+		chr(195).chr(138) => 'E', chr(195).chr(139) => 'E',
+		chr(195).chr(140) => 'I', chr(195).chr(141) => 'I',
+		chr(195).chr(142) => 'I', chr(195).chr(143) => 'I',
+		chr(195).chr(144) => 'D', chr(195).chr(145) => 'N',
+		chr(195).chr(146) => 'O', chr(195).chr(147) => 'O',
+		chr(195).chr(148) => 'O', chr(195).chr(149) => 'O',
+		chr(195).chr(150) => 'O', chr(195).chr(153) => 'U',
+		chr(195).chr(154) => 'U', chr(195).chr(155) => 'U',
+		chr(195).chr(156) => 'U', chr(195).chr(157) => 'Y',
+		chr(195).chr(158) => 'TH',chr(195).chr(159) => 's',
+		chr(195).chr(160) => 'a', chr(195).chr(161) => 'a',
+		chr(195).chr(162) => 'a', chr(195).chr(163) => 'a',
+		chr(195).chr(164) => 'a', chr(195).chr(165) => 'a',
+		chr(195).chr(166) => 'ae',chr(195).chr(167) => 'c',
+		chr(195).chr(168) => 'e', chr(195).chr(169) => 'e',
+		chr(195).chr(170) => 'e', chr(195).chr(171) => 'e',
+		chr(195).chr(172) => 'i', chr(195).chr(173) => 'i',
+		chr(195).chr(174) => 'i', chr(195).chr(175) => 'i',
+		chr(195).chr(176) => 'd', chr(195).chr(177) => 'n',
+		chr(195).chr(178) => 'o', chr(195).chr(179) => 'o',
+		chr(195).chr(180) => 'o', chr(195).chr(181) => 'o',
+		chr(195).chr(182) => 'o', chr(195).chr(184) => 'o',
+		chr(195).chr(185) => 'u', chr(195).chr(186) => 'u',
+		chr(195).chr(187) => 'u', chr(195).chr(188) => 'u',
+		chr(195).chr(189) => 'y', chr(195).chr(190) => 'th',
+		chr(195).chr(191) => 'y', chr(195).chr(152) => 'O',
+		// Decompositions for Latin Extended-A
+		chr(196).chr(128) => 'A', chr(196).chr(129) => 'a',
+		chr(196).chr(130) => 'A', chr(196).chr(131) => 'a',
+		chr(196).chr(132) => 'A', chr(196).chr(133) => 'a',
+		chr(196).chr(134) => 'C', chr(196).chr(135) => 'c',
+		chr(196).chr(136) => 'C', chr(196).chr(137) => 'c',
+		chr(196).chr(138) => 'C', chr(196).chr(139) => 'c',
+		chr(196).chr(140) => 'C', chr(196).chr(141) => 'c',
+		chr(196).chr(142) => 'D', chr(196).chr(143) => 'd',
+		chr(196).chr(144) => 'D', chr(196).chr(145) => 'd',
+		chr(196).chr(146) => 'E', chr(196).chr(147) => 'e',
+		chr(196).chr(148) => 'E', chr(196).chr(149) => 'e',
+		chr(196).chr(150) => 'E', chr(196).chr(151) => 'e',
+		chr(196).chr(152) => 'E', chr(196).chr(153) => 'e',
+		chr(196).chr(154) => 'E', chr(196).chr(155) => 'e',
+		chr(196).chr(156) => 'G', chr(196).chr(157) => 'g',
+		chr(196).chr(158) => 'G', chr(196).chr(159) => 'g',
+		chr(196).chr(160) => 'G', chr(196).chr(161) => 'g',
+		chr(196).chr(162) => 'G', chr(196).chr(163) => 'g',
+		chr(196).chr(164) => 'H', chr(196).chr(165) => 'h',
+		chr(196).chr(166) => 'H', chr(196).chr(167) => 'h',
+		chr(196).chr(168) => 'I', chr(196).chr(169) => 'i',
+		chr(196).chr(170) => 'I', chr(196).chr(171) => 'i',
+		chr(196).chr(172) => 'I', chr(196).chr(173) => 'i',
+		chr(196).chr(174) => 'I', chr(196).chr(175) => 'i',
+		chr(196).chr(176) => 'I', chr(196).chr(177) => 'i',
+		chr(196).chr(178) => 'IJ',chr(196).chr(179) => 'ij',
+		chr(196).chr(180) => 'J', chr(196).chr(181) => 'j',
+		chr(196).chr(182) => 'K', chr(196).chr(183) => 'k',
+		chr(196).chr(184) => 'k', chr(196).chr(185) => 'L',
+		chr(196).chr(186) => 'l', chr(196).chr(187) => 'L',
+		chr(196).chr(188) => 'l', chr(196).chr(189) => 'L',
+		chr(196).chr(190) => 'l', chr(196).chr(191) => 'L',
+		chr(197).chr(128) => 'l', chr(197).chr(129) => 'L',
+		chr(197).chr(130) => 'l', chr(197).chr(131) => 'N',
+		chr(197).chr(132) => 'n', chr(197).chr(133) => 'N',
+		chr(197).chr(134) => 'n', chr(197).chr(135) => 'N',
+		chr(197).chr(136) => 'n', chr(197).chr(137) => 'N',
+		chr(197).chr(138) => 'n', chr(197).chr(139) => 'N',
+		chr(197).chr(140) => 'O', chr(197).chr(141) => 'o',
+		chr(197).chr(142) => 'O', chr(197).chr(143) => 'o',
+		chr(197).chr(144) => 'O', chr(197).chr(145) => 'o',
+		chr(197).chr(146) => 'OE',chr(197).chr(147) => 'oe',
+		chr(197).chr(148) => 'R',chr(197).chr(149) => 'r',
+		chr(197).chr(150) => 'R',chr(197).chr(151) => 'r',
+		chr(197).chr(152) => 'R',chr(197).chr(153) => 'r',
+		chr(197).chr(154) => 'S',chr(197).chr(155) => 's',
+		chr(197).chr(156) => 'S',chr(197).chr(157) => 's',
+		chr(197).chr(158) => 'S',chr(197).chr(159) => 's',
+		chr(197).chr(160) => 'S', chr(197).chr(161) => 's',
+		chr(197).chr(162) => 'T', chr(197).chr(163) => 't',
+		chr(197).chr(164) => 'T', chr(197).chr(165) => 't',
+		chr(197).chr(166) => 'T', chr(197).chr(167) => 't',
+		chr(197).chr(168) => 'U', chr(197).chr(169) => 'u',
+		chr(197).chr(170) => 'U', chr(197).chr(171) => 'u',
+		chr(197).chr(172) => 'U', chr(197).chr(173) => 'u',
+		chr(197).chr(174) => 'U', chr(197).chr(175) => 'u',
+		chr(197).chr(176) => 'U', chr(197).chr(177) => 'u',
+		chr(197).chr(178) => 'U', chr(197).chr(179) => 'u',
+		chr(197).chr(180) => 'W', chr(197).chr(181) => 'w',
+		chr(197).chr(182) => 'Y', chr(197).chr(183) => 'y',
+		chr(197).chr(184) => 'Y', chr(197).chr(185) => 'Z',
+		chr(197).chr(186) => 'z', chr(197).chr(187) => 'Z',
+		chr(197).chr(188) => 'z', chr(197).chr(189) => 'Z',
+		chr(197).chr(190) => 'z', chr(197).chr(191) => 's',
+		// Decompositions for Latin Extended-B
+		chr(200).chr(152) => 'S', chr(200).chr(153) => 's',
+		chr(200).chr(154) => 'T', chr(200).chr(155) => 't',
+		// Euro Sign
+		chr(226).chr(130).chr(172) => 'E',
+		// GBP (Pound) Sign
+		chr(194).chr(163) => '',
+		// Vowels with diacritic (Vietnamese)
+		// unmarked
+		chr(198).chr(160) => 'O', chr(198).chr(161) => 'o',
+		chr(198).chr(175) => 'U', chr(198).chr(176) => 'u',
+		// grave accent
+		chr(225).chr(186).chr(166) => 'A', chr(225).chr(186).chr(167) => 'a',
+		chr(225).chr(186).chr(176) => 'A', chr(225).chr(186).chr(177) => 'a',
+		chr(225).chr(187).chr(128) => 'E', chr(225).chr(187).chr(129) => 'e',
+		chr(225).chr(187).chr(146) => 'O', chr(225).chr(187).chr(147) => 'o',
+		chr(225).chr(187).chr(156) => 'O', chr(225).chr(187).chr(157) => 'o',
+		chr(225).chr(187).chr(170) => 'U', chr(225).chr(187).chr(171) => 'u',
+		chr(225).chr(187).chr(178) => 'Y', chr(225).chr(187).chr(179) => 'y',
+		// hook
+		chr(225).chr(186).chr(162) => 'A', chr(225).chr(186).chr(163) => 'a',
+		chr(225).chr(186).chr(168) => 'A', chr(225).chr(186).chr(169) => 'a',
+		chr(225).chr(186).chr(178) => 'A', chr(225).chr(186).chr(179) => 'a',
+		chr(225).chr(186).chr(186) => 'E', chr(225).chr(186).chr(187) => 'e',
+		chr(225).chr(187).chr(130) => 'E', chr(225).chr(187).chr(131) => 'e',
+		chr(225).chr(187).chr(136) => 'I', chr(225).chr(187).chr(137) => 'i',
+		chr(225).chr(187).chr(142) => 'O', chr(225).chr(187).chr(143) => 'o',
+		chr(225).chr(187).chr(148) => 'O', chr(225).chr(187).chr(149) => 'o',
+		chr(225).chr(187).chr(158) => 'O', chr(225).chr(187).chr(159) => 'o',
+		chr(225).chr(187).chr(166) => 'U', chr(225).chr(187).chr(167) => 'u',
+		chr(225).chr(187).chr(172) => 'U', chr(225).chr(187).chr(173) => 'u',
+		chr(225).chr(187).chr(182) => 'Y', chr(225).chr(187).chr(183) => 'y',
+		// tilde
+		chr(225).chr(186).chr(170) => 'A', chr(225).chr(186).chr(171) => 'a',
+		chr(225).chr(186).chr(180) => 'A', chr(225).chr(186).chr(181) => 'a',
+		chr(225).chr(186).chr(188) => 'E', chr(225).chr(186).chr(189) => 'e',
+		chr(225).chr(187).chr(132) => 'E', chr(225).chr(187).chr(133) => 'e',
+		chr(225).chr(187).chr(150) => 'O', chr(225).chr(187).chr(151) => 'o',
+		chr(225).chr(187).chr(160) => 'O', chr(225).chr(187).chr(161) => 'o',
+		chr(225).chr(187).chr(174) => 'U', chr(225).chr(187).chr(175) => 'u',
+		chr(225).chr(187).chr(184) => 'Y', chr(225).chr(187).chr(185) => 'y',
+		// acute accent
+		chr(225).chr(186).chr(164) => 'A', chr(225).chr(186).chr(165) => 'a',
+		chr(225).chr(186).chr(174) => 'A', chr(225).chr(186).chr(175) => 'a',
+		chr(225).chr(186).chr(190) => 'E', chr(225).chr(186).chr(191) => 'e',
+		chr(225).chr(187).chr(144) => 'O', chr(225).chr(187).chr(145) => 'o',
+		chr(225).chr(187).chr(154) => 'O', chr(225).chr(187).chr(155) => 'o',
+		chr(225).chr(187).chr(168) => 'U', chr(225).chr(187).chr(169) => 'u',
+		// dot below
+		chr(225).chr(186).chr(160) => 'A', chr(225).chr(186).chr(161) => 'a',
+		chr(225).chr(186).chr(172) => 'A', chr(225).chr(186).chr(173) => 'a',
+		chr(225).chr(186).chr(182) => 'A', chr(225).chr(186).chr(183) => 'a',
+		chr(225).chr(186).chr(184) => 'E', chr(225).chr(186).chr(185) => 'e',
+		chr(225).chr(187).chr(134) => 'E', chr(225).chr(187).chr(135) => 'e',
+		chr(225).chr(187).chr(138) => 'I', chr(225).chr(187).chr(139) => 'i',
+		chr(225).chr(187).chr(140) => 'O', chr(225).chr(187).chr(141) => 'o',
+		chr(225).chr(187).chr(152) => 'O', chr(225).chr(187).chr(153) => 'o',
+		chr(225).chr(187).chr(162) => 'O', chr(225).chr(187).chr(163) => 'o',
+		chr(225).chr(187).chr(164) => 'U', chr(225).chr(187).chr(165) => 'u',
+		chr(225).chr(187).chr(176) => 'U', chr(225).chr(187).chr(177) => 'u',
+		chr(225).chr(187).chr(180) => 'Y', chr(225).chr(187).chr(181) => 'y',
+		// Vowels with diacritic (Chinese, Hanyu Pinyin)
+		chr(201).chr(145) => 'a',
+		// macron
+		chr(199).chr(149) => 'U', chr(199).chr(150) => 'u',
+		// acute accent
+		chr(199).chr(151) => 'U', chr(199).chr(152) => 'u',
+		// caron
+		chr(199).chr(141) => 'A', chr(199).chr(142) => 'a',
+		chr(199).chr(143) => 'I', chr(199).chr(144) => 'i',
+		chr(199).chr(145) => 'O', chr(199).chr(146) => 'o',
+		chr(199).chr(147) => 'U', chr(199).chr(148) => 'u',
+		chr(199).chr(153) => 'U', chr(199).chr(154) => 'u',
+		// grave accent
+		chr(199).chr(155) => 'U', chr(199).chr(156) => 'u',
+		);
+
+		// Used for locale-specific rules
+		$locale = get_locale();
+
+		if ( 'de_DE' == $locale ) {
+			$chars[ chr(195).chr(132) ] = 'Ae';
+			$chars[ chr(195).chr(164) ] = 'ae';
+			$chars[ chr(195).chr(150) ] = 'Oe';
+			$chars[ chr(195).chr(182) ] = 'oe';
+			$chars[ chr(195).chr(156) ] = 'Ue';
+			$chars[ chr(195).chr(188) ] = 'ue';
+			$chars[ chr(195).chr(159) ] = 'ss';
+		}
+
+		$string = strtr($string, $chars);
+	} else {
+		// Assume ISO-8859-1 if not UTF-8
+		$chars['in'] = chr(128).chr(131).chr(138).chr(142).chr(154).chr(158)
+			.chr(159).chr(162).chr(165).chr(181).chr(192).chr(193).chr(194)
+			.chr(195).chr(196).chr(197).chr(199).chr(200).chr(201).chr(202)
+			.chr(203).chr(204).chr(205).chr(206).chr(207).chr(209).chr(210)
+			.chr(211).chr(212).chr(213).chr(214).chr(216).chr(217).chr(218)
+			.chr(219).chr(220).chr(221).chr(224).chr(225).chr(226).chr(227)
+			.chr(228).chr(229).chr(231).chr(232).chr(233).chr(234).chr(235)
+			.chr(236).chr(237).chr(238).chr(239).chr(241).chr(242).chr(243)
+			.chr(244).chr(245).chr(246).chr(248).chr(249).chr(250).chr(251)
+			.chr(252).chr(253).chr(255);
+
+		$chars['out'] = "EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy";
+
+		$string = strtr($string, $chars['in'], $chars['out']);
+		$double_chars['in'] = array(chr(140), chr(156), chr(198), chr(208), chr(222), chr(223), chr(230), chr(240), chr(254));
+		$double_chars['out'] = array('OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th');
+		$string = str_replace($double_chars['in'], $double_chars['out'], $string);
+	}
+
+	return $string;
+}
+
+/**
+ * Sanitizes a filename, replacing whitespace with dashes.
+ *
+ * Removes special characters that are illegal in filenames on certain
+ * operating systems and special characters requiring special escaping
+ * to manipulate at the command line. Replaces spaces and consecutive
+ * dashes with a single dash. Trims period, dash and underscore from beginning
+ * and end of filename.
+ *
+ * @since 2.1.0
+ *
+ * @param string $filename The filename to be sanitized
+ * @return string The sanitized filename
+ */
+function sanitize_file_name( $filename ) {
+	$filename_raw = $filename;
+	$special_chars = array("?", "[", "]", "/", "\\", "=", "<", ">", ":", ";", ",", "'", "\"", "&", "$", "#", "*", "(", ")", "|", "~", "`", "!", "{", "}", chr(0));
+	$special_chars = apply_filters('sanitize_file_name_chars', $special_chars, $filename_raw);
+	$filename = str_replace($special_chars, '', $filename);
+	$filename = preg_replace('/[\s-]+/', '-', $filename);
+	$filename = trim($filename, '.-_');
+
+	// Split the filename into a base and extension[s]
+	$parts = explode('.', $filename);
+
+	// Return if only one extension
+	if ( count($parts) <= 2 )
+		return apply_filters('sanitize_file_name', $filename, $filename_raw);
+
+	// Process multiple extensions
+	$filename = array_shift($parts);
+	$extension = array_pop($parts);
+	$mimes = get_allowed_mime_types();
+
+	// Loop over any intermediate extensions. Munge them with a trailing underscore if they are a 2 - 5 character
+	// long alpha string not in the extension whitelist.
+	foreach ( (array) $parts as $part) {
+		$filename .= '.' . $part;
+
+		if ( preg_match("/^[a-zA-Z]{2,5}\d?$/", $part) ) {
+			$allowed = false;
+			foreach ( $mimes as $ext_preg => $mime_match ) {
+				$ext_preg = '!^(' . $ext_preg . ')$!i';
+				if ( preg_match( $ext_preg, $part ) ) {
+					$allowed = true;
+					break;
+				}
+			}
+			if ( !$allowed )
+				$filename .= '_';
+		}
+	}
+	$filename .= '.' . $extension;
+
+	return apply_filters('sanitize_file_name', $filename, $filename_raw);
+}
+
+/**
+ * Sanitizes a username, stripping out unsafe characters.
+ *
+ * Removes tags, octets, entities, and if strict is enabled, will only keep
+ * alphanumeric, _, space, ., -, @. After sanitizing, it passes the username,
+ * raw username (the username in the parameter), and the value of $strict as
+ * parameters for the 'sanitize_user' filter.
+ *
+ * @since 2.0.0
+ * @uses apply_filters() Calls 'sanitize_user' hook on username, raw username,
+ *		and $strict parameter.
+ *
+ * @param string $username The username to be sanitized.
+ * @param bool $strict If set limits $username to specific characters. Default false.
+ * @return string The sanitized username, after passing through filters.
+ */
+function sanitize_user( $username, $strict = false ) {
+	$raw_username = $username;
+	$username = wp_strip_all_tags( $username );
+	$username = remove_accents( $username );
+	// Kill octets
+	$username = preg_replace( '|%([a-fA-F0-9][a-fA-F0-9])|', '', $username );
+	$username = preg_replace( '/&.+?;/', '', $username ); // Kill entities
+
+	// If strict, reduce to ASCII for max portability.
+	if ( $strict )
+		$username = preg_replace( '|[^a-z0-9 _.\-@]|i', '', $username );
+
+	$username = trim( $username );
+	// Consolidate contiguous whitespace
+	$username = preg_replace( '|\s+|', ' ', $username );
+
+	return apply_filters( 'sanitize_user', $username, $raw_username, $strict );
+}
+
+/**
+ * Sanitizes a string key.
+ *
+ * Keys are used as internal identifiers. Lowercase alphanumeric characters, dashes and underscores are allowed.
+ *
+ * @since 3.0.0
+ *
+ * @param string $key String key
+ * @return string Sanitized key
+ */
+function sanitize_key( $key ) {
+	$raw_key = $key;
+	$key = strtolower( $key );
+	$key = preg_replace( '/[^a-z0-9_\-]/', '', $key );
+	return apply_filters( 'sanitize_key', $key, $raw_key );
+}
+
+/**
+ * Sanitizes a title, or returns a fallback title.
+ *
+ * Specifically, HTML and PHP tags are stripped. Further actions can be added
+ * via the plugin API. If $title is empty and $fallback_title is set, the latter
+ * will be used.
+ *
+ * @since 1.0.0
+ *
+ * @param string $title The string to be sanitized.
+ * @param string $fallback_title Optional. A title to use if $title is empty.
+ * @param string $context Optional. The operation for which the string is sanitized
+ * @return string The sanitized string.
+ */
+function sanitize_title( $title, $fallback_title = '', $context = 'save' ) {
+	$raw_title = $title;
+
+	if ( 'save' == $context )
+		$title = remove_accents($title);
+
+	$title = apply_filters('sanitize_title', $title, $raw_title, $context);
+
+	if ( '' === $title || false === $title )
+		$title = $fallback_title;
+
+	return $title;
+}
+
+/**
+ * Sanitizes a title with the 'query' context.
+ *
+ * Used for querying the database for a value from URL.
+ *
+ * @since 3.1.0
+ * @uses sanitize_title()
+ *
+ * @param string $title The string to be sanitized.
+ * @return string The sanitized string.
+ */
+function sanitize_title_for_query( $title ) {
+	return sanitize_title( $title, '', 'query' );
+}
+
+/**
+ * Sanitizes a title, replacing whitespace and a few other characters with dashes.
+ *
+ * Limits the output to alphanumeric characters, underscore (_) and dash (-).
+ * Whitespace becomes a dash.
+ *
+ * @since 1.2.0
+ *
+ * @param string $title The title to be sanitized.
+ * @param string $raw_title Optional. Not used.
+ * @param string $context Optional. The operation for which the string is sanitized.
+ * @return string The sanitized title.
+ */
+function sanitize_title_with_dashes( $title, $raw_title = '', $context = 'display' ) {
+	$title = strip_tags($title);
+	// Preserve escaped octets.
+	$title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);
+	// Remove percent signs that are not part of an octet.
+	$title = str_replace('%', '', $title);
+	// Restore octets.
+	$title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);
+
+	if (seems_utf8($title)) {
+		if (function_exists('mb_strtolower')) {
+			$title = mb_strtolower($title, 'UTF-8');
+		}
+		$title = utf8_uri_encode($title, 200);
+	}
+
+	$title = strtolower($title);
+	$title = preg_replace('/&.+?;/', '', $title); // kill entities
+	$title = str_replace('.', '-', $title);
+
+	if ( 'save' == $context ) {
+		// Convert nbsp, ndash and mdash to hyphens
+		$title = str_replace( array( '%c2%a0', '%e2%80%93', '%e2%80%94' ), '-', $title );
+
+		// Strip these characters entirely
+		$title = str_replace( array(
+			// iexcl and iquest
+			'%c2%a1', '%c2%bf',
+			// angle quotes
+			'%c2%ab', '%c2%bb', '%e2%80%b9', '%e2%80%ba',
+			// curly quotes
+			'%e2%80%98', '%e2%80%99', '%e2%80%9c', '%e2%80%9d',
+			'%e2%80%9a', '%e2%80%9b', '%e2%80%9e', '%e2%80%9f',
+			// copy, reg, deg, hellip and trade
+			'%c2%a9', '%c2%ae', '%c2%b0', '%e2%80%a6', '%e2%84%a2',
+			// acute accents
+			'%c2%b4', '%cb%8a', '%cc%81', '%cd%81',
+			// grave accent, macron, caron
+			'%cc%80', '%cc%84', '%cc%8c',
+		), '', $title );
+
+		// Convert times to x
+		$title = str_replace( '%c3%97', 'x', $title );
+	}
+
+	$title = preg_replace('/[^%a-z0-9 _-]/', '', $title);
+	$title = preg_replace('/\s+/', '-', $title);
+	$title = preg_replace('|-+|', '-', $title);
+	$title = trim($title, '-');
+
+	return $title;
+}
+
+/**
+ * Ensures a string is a valid SQL order by clause.
+ *
+ * Accepts one or more columns, with or without ASC/DESC, and also accepts
+ * RAND().
+ *
+ * @since 2.5.1
+ *
+ * @param string $orderby Order by string to be checked.
+ * @return string|bool Returns the order by clause if it is a match, false otherwise.
+ */
+function sanitize_sql_orderby( $orderby ){
+	preg_match('/^\s*([a-z0-9_]+(\s+(ASC|DESC))?(\s*,\s*|\s*$))+|^\s*RAND\(\s*\)\s*$/i', $orderby, $obmatches);
+	if ( !$obmatches )
+		return false;
+	return $orderby;
+}
+
+/**
+ * Sanitizes an HTML classname to ensure it only contains valid characters.
+ *
+ * Strips the string down to A-Z,a-z,0-9,_,-. If this results in an empty
+ * string then it will return the alternative value supplied.
+ *
+ * @todo Expand to support the full range of CDATA that a class attribute can contain.
+ *
+ * @since 2.8.0
+ *
+ * @param string $class The classname to be sanitized
+ * @param string $fallback Optional. The value to return if the sanitization end's up as an empty string.
+ * 	Defaults to an empty string.
+ * @return string The sanitized value
+ */
+function sanitize_html_class( $class, $fallback = '' ) {
+	//Strip out any % encoded octets
+	$sanitized = preg_replace( '|%[a-fA-F0-9][a-fA-F0-9]|', '', $class );
+
+	//Limit to A-Z,a-z,0-9,_,-
+	$sanitized = preg_replace( '/[^A-Za-z0-9_-]/', '', $sanitized );
+
+	if ( '' == $sanitized )
+		$sanitized = $fallback;
+
+	return apply_filters( 'sanitize_html_class', $sanitized, $class, $fallback );
+}
+
+/**
+ * Converts a number of characters from a string.
+ *
+ * Metadata tags <> and <<category>> are removed, <<br>> and <<hr>> are
+ * converted into correct XHTML and Unicode characters are converted to the
+ * valid range.
+ *
+ * @since 0.71
+ *
+ * @param string $content String of characters to be converted.
+ * @param string $deprecated Not used.
+ * @return string Converted string.
+ */
+function convert_chars($content, $deprecated = '') {
+	if ( !empty( $deprecated ) )
+		_deprecated_argument( __FUNCTION__, '0.71' );
+
+	// Translation of invalid Unicode references range to valid range
+	$wp_htmltranswinuni = array(
+	'€' => '€', // the Euro sign
+	'' => '',
+	'‚' => '‚', // these are Windows CP1252 specific characters
+	'ƒ' => 'ƒ',  // they would look weird on non-Windows browsers
+	'„' => '„',
+	'…' => '…',
+	'†' => '†',
+	'‡' => '‡',
+	'ˆ' => 'ˆ',
+	'‰' => '‰',
+	'Š' => 'Š',
+	'‹' => '‹',
+	'Œ' => 'Œ',
+	'' => '',
+	'Ž' => 'Ž',
+	'' => '',
+	'' => '',
+	'‘' => '‘',
+	'’' => '’',
+	'“' => '“',
+	'”' => '”',
+	'•' => '•',
+	'–' => '–',
+	'—' => '—',
+	'˜' => '˜',
+	'™' => '™',
+	'š' => 'š',
+	'›' => '›',
+	'œ' => 'œ',
+	'' => '',
+	'ž' => 'ž',
+	'Ÿ' => 'Ÿ'
+	);
+
+	// Remove metadata tags
+	$content = preg_replace('/<title>(.+?)<\/title>/','',$content);
+	$content = preg_replace('/<category>(.+?)<\/category>/','',$content);
+
+	// Converts lone & characters into & (a.k.a. &)
+	$content = preg_replace('/&([^#])(?![a-z1-4]{1,8};)/i', '&$1', $content);
+
+	// Fix Word pasting
+	$content = strtr($content, $wp_htmltranswinuni);
+
+	// Just a little XHTML help
+	$content = str_replace('<br>', '<br />', $content);
+	$content = str_replace('<hr>', '<hr />', $content);
+
+	return $content;
+}
+
+/**
+ * Balances tags if forced to, or if the 'use_balanceTags' option is set to true.
+ *
+ * @since 0.71
+ *
+ * @param string $text Text to be balanced
+ * @param bool $force If true, forces balancing, ignoring the value of the option. Default false.
+ * @return string Balanced text
+ */
+function balanceTags( $text, $force = false ) {
+	if ( $force || get_option('use_balanceTags') == 1 )
+		return force_balance_tags( $text );
+	else
+		return $text;
+}
+
+/**
+ * Balances tags of string using a modified stack.
+ *
+ * @since 2.0.4
+ *
+ * @author Leonard Lin <leonard@acm.org>
+ * @license GPL
+ * @copyright November 4, 2001
+ * @version 1.1
+ * @todo Make better - change loop condition to $text in 1.2
+ * @internal Modified by Scott Reilly (coffee2code) 02 Aug 2004
+ *		1.1  Fixed handling of append/stack pop order of end text
+ *			 Added Cleaning Hooks
+ *		1.0  First Version
+ *
+ * @param string $text Text to be balanced.
+ * @return string Balanced text.
+ */
+function force_balance_tags( $text ) {
+	$tagstack = array();
+	$stacksize = 0;
+	$tagqueue = '';
+	$newtext = '';
+	// Known single-entity/self-closing tags
+	$single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source' );
+	// Tags that can be immediately nested within themselves
+	$nestable_tags = array( 'blockquote', 'div', 'object', 'q', 'span' );
+
+	// WP bug fix for comments - in case you REALLY meant to type '< !--'
+	$text = str_replace('< !--', '<    !--', $text);
+	// WP bug fix for LOVE <3 (and other situations with '<' before a number)
+	$text = preg_replace('#<([0-9]{1})#', '<$1', $text);
+
+	while ( preg_match("/<(\/?[\w:]*)\s*([^>]*)>/", $text, $regex) ) {
+		$newtext .= $tagqueue;
+
+		$i = strpos($text, $regex[0]);
+		$l = strlen($regex[0]);
+
+		// clear the shifter
+		$tagqueue = '';
+		// Pop or Push
+		if ( isset($regex[1][0]) && '/' == $regex[1][0] ) { // End Tag
+			$tag = strtolower(substr($regex[1],1));
+			// if too many closing tags
+			if( $stacksize <= 0 ) {
+				$tag = '';
+				// or close to be safe $tag = '/' . $tag;
+			}
+			// if stacktop value = tag close value then pop
+			else if ( $tagstack[$stacksize - 1] == $tag ) { // found closing tag
+				$tag = '</' . $tag . '>'; // Close Tag
+				// Pop
+				array_pop( $tagstack );
+				$stacksize--;
+			} else { // closing tag not at top, search for it
+				for ( $j = $stacksize-1; $j >= 0; $j-- ) {
+					if ( $tagstack[$j] == $tag ) {
+					// add tag to tagqueue
+						for ( $k = $stacksize-1; $k >= $j; $k--) {
+							$tagqueue .= '</' . array_pop( $tagstack ) . '>';
+							$stacksize--;
+						}
+						break;
+					}
+				}
+				$tag = '';
+			}
+		} else { // Begin Tag
+			$tag = strtolower($regex[1]);
+
+			// Tag Cleaning
+
+			// If it's an empty tag "< >", do nothing
+			if ( '' == $tag ) {
+				// do nothing
+			}
+			// ElseIf it presents itself as a self-closing tag...
+			elseif ( substr( $regex[2], -1 ) == '/' ) {
+				// ...but it isn't a known single-entity self-closing tag, then don't let it be treated as such and
+				// immediately close it with a closing tag (the tag will encapsulate no text as a result)
+				if ( ! in_array( $tag, $single_tags ) )
+					$regex[2] = trim( substr( $regex[2], 0, -1 ) ) . "></$tag";
+			}
+			// ElseIf it's a known single-entity tag but it doesn't close itself, do so
+			elseif ( in_array($tag, $single_tags) ) {
+				$regex[2] .= '/';
+			}
+			// Else it's not a single-entity tag
+			else {
+				// If the top of the stack is the same as the tag we want to push, close previous tag
+				if ( $stacksize > 0 && !in_array($tag, $nestable_tags) && $tagstack[$stacksize - 1] == $tag ) {
+					$tagqueue = '</' . array_pop( $tagstack ) . '>';
+					$stacksize--;
+				}
+				$stacksize = array_push( $tagstack, $tag );
+			}
+
+			// Attributes
+			$attributes = $regex[2];
+			if( ! empty( $attributes ) && $attributes[0] != '>' )
+				$attributes = ' ' . $attributes;
+
+			$tag = '<' . $tag . $attributes . '>';
+			//If already queuing a close tag, then put this tag on, too
+			if ( !empty($tagqueue) ) {
+				$tagqueue .= $tag;
+				$tag = '';
+			}
+		}
+		$newtext .= substr($text, 0, $i) . $tag;
+		$text = substr($text, $i + $l);
+	}
+
+	// Clear Tag Queue
+	$newtext .= $tagqueue;
+
+	// Add Remaining text
+	$newtext .= $text;
+
+	// Empty Stack
+	while( $x = array_pop($tagstack) )
+		$newtext .= '</' . $x . '>'; // Add remaining tags to close
+
+	// WP fix for the bug with HTML comments
+	$newtext = str_replace("< !--","<!--",$newtext);
+	$newtext = str_replace("<    !--","< !--",$newtext);
+
+	return $newtext;
+}
+
+/**
+ * Acts on text which is about to be edited.
+ *
+ * The $content is run through esc_textarea(), which uses htmlspecialchars()
+ * to convert special characters to HTML entities. If $richedit is set to true,
+ * it is simply a holder for the 'format_to_edit' filter.
+ *
+ * @since 0.71
+ *
+ * @param string $content The text about to be edited.
+ * @param bool $richedit Whether the $content should not pass through htmlspecialchars(). Default false (meaning it will be passed).
+ * @return string The text after the filter (and possibly htmlspecialchars()) has been run.
+ */
+function format_to_edit( $content, $richedit = false ) {
+	$content = apply_filters( 'format_to_edit', $content );
+	if ( ! $richedit )
+		$content = esc_textarea( $content );
+	return $content;
+}
+
+/**
+ * Holder for the 'format_to_post' filter.
+ *
+ * @since 0.71
+ *
+ * @param string $content The text to pass through the filter.
+ * @return string Text returned from the 'format_to_post' filter.
+ */
+function format_to_post($content) {
+	$content = apply_filters('format_to_post', $content);
+	return $content;
+}
+
+/**
+ * Add leading zeros when necessary.
+ *
+ * If you set the threshold to '4' and the number is '10', then you will get
+ * back '0010'. If you set the threshold to '4' and the number is '5000', then you
+ * will get back '5000'.
+ *
+ * Uses sprintf to append the amount of zeros based on the $threshold parameter
+ * and the size of the number. If the number is large enough, then no zeros will
+ * be appended.
+ *
+ * @since 0.71
+ *
+ * @param mixed $number Number to append zeros to if not greater than threshold.
+ * @param int $threshold Digit places number needs to be to not have zeros added.
+ * @return string Adds leading zeros to number if needed.
+ */
+function zeroise($number, $threshold) {
+	return sprintf('%0'.$threshold.'s', $number);
+}
+
+/**
+ * Adds backslashes before letters and before a number at the start of a string.
+ *
+ * @since 0.71
+ *
+ * @param string $string Value to which backslashes will be added.
+ * @return string String with backslashes inserted.
+ */
+function backslashit($string) {
+	if ( isset( $string[0] ) && $string[0] >= '0' && $string[0] <= '9' )
+		$string = '\\\\' . $string;
+	return addcslashes( $string, 'A..Za..z' );
+}
+
+/**
+ * Appends a trailing slash.
+ *
+ * Will remove trailing slash if it exists already before adding a trailing
+ * slash. This prevents double slashing a string or path.
+ *
+ * The primary use of this is for paths and thus should be used for paths. It is
+ * not restricted to paths and offers no specific path support.
+ *
+ * @since 1.2.0
+ * @uses untrailingslashit() Unslashes string if it was slashed already.
+ *
+ * @param string $string What to add the trailing slash to.
+ * @return string String with trailing slash added.
+ */
+function trailingslashit($string) {
+	return untrailingslashit($string) . '/';
+}
+
+/**
+ * Removes trailing slash if it exists.
+ *
+ * The primary use of this is for paths and thus should be used for paths. It is
+ * not restricted to paths and offers no specific path support.
+ *
+ * @since 2.2.0
+ *
+ * @param string $string What to remove the trailing slash from.
+ * @return string String without the trailing slash.
+ */
+function untrailingslashit($string) {
+	return rtrim($string, '/');
+}
+
+/**
+ * Adds slashes to escape strings.
+ *
+ * Slashes will first be removed if magic_quotes_gpc is set, see {@link
+ * http://www.php.net/magic_quotes} for more details.
+ *
+ * @since 0.71
+ *
+ * @param string $gpc The string returned from HTTP request data.
+ * @return string Returns a string escaped with slashes.
+ */
+function addslashes_gpc($gpc) {
+	if ( get_magic_quotes_gpc() )
+		$gpc = stripslashes($gpc);
+
+	return wp_slash($gpc);
+}
+
+/**
+ * Navigates through an array and removes slashes from the values.
+ *
+ * If an array is passed, the array_map() function causes a callback to pass the
+ * value back to the function. The slashes from this value will removed.
+ *
+ * @since 2.0.0
+ *
+ * @param mixed $value The value to be stripped.
+ * @return mixed Stripped value.
+ */
+function stripslashes_deep($value) {
+	if ( is_array($value) ) {
+		$value = array_map('stripslashes_deep', $value);
+	} elseif ( is_object($value) ) {
+		$vars = get_object_vars( $value );
+		foreach ($vars as $key=>$data) {
+			$value->{$key} = stripslashes_deep( $data );
+		}
+	} elseif ( is_string( $value ) ) {
+		$value = stripslashes($value);
+	}
+
+	return $value;
+}
+
+/**
+ * Navigates through an array and encodes the values to be used in a URL.
+ *
+ *
+ * @since 2.2.0
+ *
+ * @param array|string $value The array or string to be encoded.
+ * @return array|string $value The encoded array (or string from the callback).
+ */
+function urlencode_deep($value) {
+	$value = is_array($value) ? array_map('urlencode_deep', $value) : urlencode($value);
+	return $value;
+}
+
+/**
+ * Navigates through an array and raw encodes the values to be used in a URL.
+ *
+ * @since 3.4.0
+ *
+ * @param array|string $value The array or string to be encoded.
+ * @return array|string $value The encoded array (or string from the callback).
+ */
+function rawurlencode_deep( $value ) {
+	return is_array( $value ) ? array_map( 'rawurlencode_deep', $value ) : rawurlencode( $value );
+}
+
+/**
+ * Converts email addresses characters to HTML entities to block spam bots.
+ *
+ * @since 0.71
+ *
+ * @param string $email_address Email address.
+ * @param int $hex_encoding Optional. Set to 1 to enable hex encoding.
+ * @return string Converted email address.
+ */
+function antispambot( $email_address, $hex_encoding = 0 ) {
+	$email_no_spam_address = '';
+	for ( $i = 0; $i < strlen( $email_address ); $i++ ) {
+		$j = rand( 0, 1 + $hex_encoding );
+		if ( $j == 0 ) {
+			$email_no_spam_address .= '&#' . ord( $email_address[$i] ) . ';';
+		} elseif ( $j == 1 ) {
+			$email_no_spam_address .= $email_address[$i];
+		} elseif ( $j == 2 ) {
+			$email_no_spam_address .= '%' . zeroise( dechex( ord( $email_address[$i] ) ), 2 );
+		}
+	}
+
+	$email_no_spam_address = str_replace( '@', '@', $email_no_spam_address );
+
+	return $email_no_spam_address;
+}
+
+/**
+ * Callback to convert URI match to HTML A element.
+ *
+ * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link
+ * make_clickable()}.
+ *
+ * @since 2.3.2
+ * @access private
+ *
+ * @param array $matches Single Regex Match.
+ * @return string HTML A element with URI address.
+ */
+function _make_url_clickable_cb($matches) {
+	$url = $matches[2];
+
+	if ( ')' == $matches[3] && strpos( $url, '(' ) ) {
+		// If the trailing character is a closing parethesis, and the URL has an opening parenthesis in it, add the closing parenthesis to the URL.
+		// Then we can let the parenthesis balancer do its thing below.
+		$url .= $matches[3];
+		$suffix = '';
+	} else {
+		$suffix = $matches[3];
+	}
+
+	// Include parentheses in the URL only if paired
+	while ( substr_count( $url, '(' ) < substr_count( $url, ')' ) ) {
+		$suffix = strrchr( $url, ')' ) . $suffix;
+		$url = substr( $url, 0, strrpos( $url, ')' ) );
+	}
+
+	$url = esc_url($url);
+	if ( empty($url) )
+		return $matches[0];
+
+	return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $suffix;
+}
+
+/**
+ * Callback to convert URL match to HTML A element.
+ *
+ * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link
+ * make_clickable()}.
+ *
+ * @since 2.3.2
+ * @access private
+ *
+ * @param array $matches Single Regex Match.
+ * @return string HTML A element with URL address.
+ */
+function _make_web_ftp_clickable_cb($matches) {
+	$ret = '';
+	$dest = $matches[2];
+	$dest = 'http://' . $dest;
+	$dest = esc_url($dest);
+	if ( empty($dest) )
+		return $matches[0];
+
+	// removed trailing [.,;:)] from URL
+	if ( in_array( substr($dest, -1), array('.', ',', ';', ':', ')') ) === true ) {
+		$ret = substr($dest, -1);
+		$dest = substr($dest, 0, strlen($dest)-1);
+	}
+	return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>$ret";
+}
+
+/**
+ * Callback to convert email address match to HTML A element.
+ *
+ * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link
+ * make_clickable()}.
+ *
+ * @since 2.3.2
+ * @access private
+ *
+ * @param array $matches Single Regex Match.
+ * @return string HTML A element with email address.
+ */
+function _make_email_clickable_cb($matches) {
+	$email = $matches[2] . '@' . $matches[3];
+	return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
+}
+
+/**
+ * Convert plaintext URI to HTML links.
+ *
+ * Converts URI, www and ftp, and email addresses. Finishes by fixing links
+ * within links.
+ *
+ * @since 0.71
+ *
+ * @param string $text Content to convert URIs.
+ * @return string Content with converted URIs.
+ */
+function make_clickable( $text ) {
+	$r = '';
+	$textarr = preg_split( '/(<[^<>]+>)/', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // split out HTML tags
+	foreach ( $textarr as $piece ) {
+		if ( empty( $piece ) || ( $piece[0] == '<' && ! preg_match('|^<\s*[\w]{1,20}+://|', $piece) ) ) {
+			$r .= $piece;
+			continue;
+		}
+
+		// Long strings might contain expensive edge cases ...
+		if ( 10000 < strlen( $piece ) ) {
+			// ... break it up
+			foreach ( _split_str_by_whitespace( $piece, 2100 ) as $chunk ) { // 2100: Extra room for scheme and leading and trailing paretheses
+				if ( 2101 < strlen( $chunk ) ) {
+					$r .= $chunk; // Too big, no whitespace: bail.
+				} else {
+					$r .= make_clickable( $chunk );
+				}
+			}
+		} else {
+			$ret = " $piece "; // Pad with whitespace to simplify the regexes
+
+			$url_clickable = '~
+				([\\s(<.,;:!?])                                        # 1: Leading whitespace, or punctuation
+				(                                                      # 2: URL
+					[\\w]{1,20}+://                                # Scheme and hier-part prefix
+					(?=\S{1,2000}\s)                               # Limit to URLs less than about 2000 characters long
+					[\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]*+         # Non-punctuation URL character
+					(?:                                            # Unroll the Loop: Only allow puctuation URL character if followed by a non-punctuation URL character
+						[\'.,;:!?)]                            # Punctuation URL character
+						[\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]++ # Non-punctuation URL character
+					)*
+				)
+				(\)?)                                                  # 3: Trailing closing parenthesis (for parethesis balancing post processing)
+			~xS'; // The regex is a non-anchored pattern and does not have a single fixed starting character.
+			      // Tell PCRE to spend more time optimizing since, when used on a page load, it will probably be used several times.
+
+			$ret = preg_replace_callback( $url_clickable, '_make_url_clickable_cb', $ret );
+
+			$ret = preg_replace_callback( '#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]+)#is', '_make_web_ftp_clickable_cb', $ret );
+			$ret = preg_replace_callback( '#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret );
+
+			$ret = substr( $ret, 1, -1 ); // Remove our whitespace padding.
+			$r .= $ret;
+		}
+	}
+
+	// Cleanup of accidental links within links
+	$r = preg_replace( '#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i', "$1$3</a>", $r );
+	return $r;
+}
+
+/**
+ * Breaks a string into chunks by splitting at whitespace characters.
+ * The length of each returned chunk is as close to the specified length goal as possible,
+ * with the caveat that each chunk includes its trailing delimiter.
+ * Chunks longer than the goal are guaranteed to not have any inner whitespace.
+ *
+ * Joining the returned chunks with empty delimiters reconstructs the input string losslessly.
+ *
+ * Input string must have no null characters (or eventual transformations on output chunks must not care about null characters)
+ *
+ * <code>
+ * _split_str_by_whitespace( "1234 67890 1234 67890a cd 1234   890 123456789 1234567890a    45678   1 3 5 7 90 ", 10 ) ==
+ * array (
+ *   0 => '1234 67890 ',  // 11 characters: Perfect split
+ *   1 => '1234 ',        //  5 characters: '1234 67890a' was too long
+ *   2 => '67890a cd ',   // 10 characters: '67890a cd 1234' was too long
+ *   3 => '1234   890 ',  // 11 characters: Perfect split
+ *   4 => '123456789 ',   // 10 characters: '123456789 1234567890a' was too long
+ *   5 => '1234567890a ', // 12 characters: Too long, but no inner whitespace on which to split
+ *   6 => '   45678   ',  // 11 characters: Perfect split
+ *   7 => '1 3 5 7 9',    //  9 characters: End of $string
+ * );
+ * </code>
+ *
+ * @since 3.4.0
+ * @access private
+ *
+ * @param string $string The string to split.
+ * @param int $goal The desired chunk length.
+ * @return array Numeric array of chunks.
+ */
+function _split_str_by_whitespace( $string, $goal ) {
+	$chunks = array();
+
+	$string_nullspace = strtr( $string, "\r\n\t\v\f ", "\000\000\000\000\000\000" );
+
+	while ( $goal < strlen( $string_nullspace ) ) {
+		$pos = strrpos( substr( $string_nullspace, 0, $goal + 1 ), "\000" );
+
+		if ( false === $pos ) {
+			$pos = strpos( $string_nullspace, "\000", $goal + 1 );
+			if ( false === $pos ) {
+				break;
+			}
+		}
+
+		$chunks[] = substr( $string, 0, $pos + 1 );
+		$string = substr( $string, $pos + 1 );
+		$string_nullspace = substr( $string_nullspace, $pos + 1 );
+	}
+
+	if ( $string ) {
+		$chunks[] = $string;
+	}
+
+	return $chunks;
+}
+
+/**
+ * Adds rel nofollow string to all HTML A elements in content.
+ *
+ * @since 1.5.0
+ *
+ * @param string $text Content that may contain HTML A elements.
+ * @return string Converted content.
+ */
+function wp_rel_nofollow( $text ) {
+	// This is a pre save filter, so text is already escaped.
+	$text = stripslashes($text);
+	$text = preg_replace_callback('|<a (.+?)>|i', 'wp_rel_nofollow_callback', $text);
+	$text = wp_slash($text);
+	return $text;
+}
+
+/**
+ * Callback to add rel=nofollow string to HTML A element.
+ *
+ * Will remove already existing rel="nofollow" and rel='nofollow' from the
+ * string to prevent from invalidating (X)HTML.
+ *
+ * @since 2.3.0
+ *
+ * @param array $matches Single Match
+ * @return string HTML A Element with rel nofollow.
+ */
+function wp_rel_nofollow_callback( $matches ) {
+	$text = $matches[1];
+	$text = str_replace(array(' rel="nofollow"', " rel='nofollow'"), '', $text);
+	return "<a $text rel=\"nofollow\">";
+}
+
+/**
+ * Convert one smiley code to the icon graphic file equivalent.
+ *
+ * Callback handler for {@link convert_smilies()}.
+ * Looks up one smiley code in the $wpsmiliestrans global array and returns an
+ * <img> string for that smiley.
+ *
+ * @global array $wpsmiliestrans
+ * @since 2.8.0
+ *
+ * @param array $matches Single match. Smiley code to convert to image.
+ * @return string Image string for smiley.
+ */
+function translate_smiley( $matches ) {
+	global $wpsmiliestrans;
+
+	if ( count( $matches ) == 0 )
+		return '';
+
+	$smiley = trim( reset( $matches ) );
+	$img = $wpsmiliestrans[ $smiley ];
+	$smiley_masked = esc_attr( $smiley );
+
+	$src_url = apply_filters( 'smilies_src', includes_url( "images/smilies/$img" ), $img, site_url() );
+
+	return " <img src='$src_url' alt='$smiley_masked' class='wp-smiley' /> ";
+}
+
+/**
+ * Convert text equivalent of smilies to images.
+ *
+ * Will only convert smilies if the option 'use_smilies' is true and the global
+ * used in the function isn't empty.
+ *
+ * @since 0.71
+ * @uses $wp_smiliessearch
+ *
+ * @param string $text Content to convert smilies from text.
+ * @return string Converted content with text smilies replaced with images.
+ */
+function convert_smilies($text) {
+	global $wp_smiliessearch;
+	$output = '';
+	if ( get_option('use_smilies') && !empty($wp_smiliessearch) ) {
+		// HTML loop taken from texturize function, could possible be consolidated
+		$textarr = preg_split("/(<.*>)/U", $text, -1, PREG_SPLIT_DELIM_CAPTURE); // capture the tags as well as in between
+		$stop = count($textarr);// loop stuff
+		for ($i = 0; $i < $stop; $i++) {
+			$content = $textarr[$i];
+			if ((strlen($content) > 0) && ('<' != $content[0])) { // If it's not a tag
+				$content = preg_replace_callback($wp_smiliessearch, 'translate_smiley', $content);
+			}
+			$output .= $content;
+		}
+	} else {
+		// return default text.
+		$output = $text;
+	}
+	return $output;
+}
+
+/**
+ * Verifies that an email is valid.
+ *
+ * Does not grok i18n domains. Not RFC compliant.
+ *
+ * @since 0.71
+ *
+ * @param string $email Email address to verify.
+ * @param boolean $deprecated Deprecated.
+ * @return string|bool Either false or the valid email address.
+ */
+function is_email( $email, $deprecated = false ) {
+	if ( ! empty( $deprecated ) )
+		_deprecated_argument( __FUNCTION__, '3.0' );
+
+	// Test for the minimum length the email can be
+	if ( strlen( $email ) < 3 ) {
+		return apply_filters( 'is_email', false, $email, 'email_too_short' );
+	}
+
+	// Test for an @ character after the first position
+	if ( strpos( $email, '@', 1 ) === false ) {
+		return apply_filters( 'is_email', false, $email, 'email_no_at' );
+	}
+
+	// Split out the local and domain parts
+	list( $local, $domain ) = explode( '@', $email, 2 );
+
+	// LOCAL PART
+	// Test for invalid characters
+	if ( !preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]+$/', $local ) ) {
+		return apply_filters( 'is_email', false, $email, 'local_invalid_chars' );
+	}
+
+	// DOMAIN PART
+	// Test for sequences of periods
+	if ( preg_match( '/\.{2,}/', $domain ) ) {
+		return apply_filters( 'is_email', false, $email, 'domain_period_sequence' );
+	}
+
+	// Test for leading and trailing periods and whitespace
+	if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) {
+		return apply_filters( 'is_email', false, $email, 'domain_period_limits' );
+	}
+
+	// Split the domain into subs
+	$subs = explode( '.', $domain );
+
+	// Assume the domain will have at least two subs
+	if ( 2 > count( $subs ) ) {
+		return apply_filters( 'is_email', false, $email, 'domain_no_periods' );
+	}
+
+	// Loop through each sub
+	foreach ( $subs as $sub ) {
+		// Test for leading and trailing hyphens and whitespace
+		if ( trim( $sub, " \t\n\r\0\x0B-" ) !== $sub ) {
+			return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' );
+		}
+
+		// Test for invalid characters
+		if ( !preg_match('/^[a-z0-9-]+$/i', $sub ) ) {
+			return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' );
+		}
+	}
+
+	// Congratulations your email made it!
+	return apply_filters( 'is_email', $email, $email, null );
+}
+
+/**
+ * Convert to ASCII from email subjects.
+ *
+ * @since 1.2.0
+ *
+ * @param string $string Subject line
+ * @return string Converted string to ASCII
+ */
+function wp_iso_descrambler($string) {
+	/* this may only work with iso-8859-1, I'm afraid */
+	if (!preg_match('#\=\?(.+)\?Q\?(.+)\?\=#i', $string, $matches)) {
+		return $string;
+	} else {
+		$subject = str_replace('_', ' ', $matches[2]);
+		$subject = preg_replace_callback('#\=([0-9a-f]{2})#i', '_wp_iso_convert', $subject);
+		return $subject;
+	}
+}
+
+/**
+ * Helper function to convert hex encoded chars to ASCII
+ *
+ * @since 3.1.0
+ * @access private
+ *
+ * @param array $match The preg_replace_callback matches array
+ * @return array Converted chars
+ */
+function _wp_iso_convert( $match ) {
+	return chr( hexdec( strtolower( $match[1] ) ) );
+}
+
+/**
+ * Returns a date in the GMT equivalent.
+ *
+ * Requires and returns a date in the Y-m-d H:i:s format. If there is a
+ * timezone_string available, the date is assumed to be in that timezone,
+ * otherwise it simply subtracts the value of the 'gmt_offset' option. Return
+ * format can be overridden using the $format parameter.
+ *
+ * @since 1.2.0
+ *
+ * @uses get_option() to retrieve the value of 'gmt_offset'.
+ * @param string $string The date to be converted.
+ * @param string $format The format string for the returned date (default is Y-m-d H:i:s)
+ * @return string GMT version of the date provided.
+ */
+function get_gmt_from_date( $string, $format = 'Y-m-d H:i:s' ) {
+	$tz = get_option( 'timezone_string' );
+	if ( $tz ) {
+		$datetime = date_create( $string, new DateTimeZone( $tz ) );
+		if ( ! $datetime )
+			return gmdate( $format, 0 );
+		$datetime->setTimezone( new DateTimeZone( 'UTC' ) );
+		$string_gmt = $datetime->format( $format );
+	} else {
+		if ( ! preg_match( '#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches ) )
+			return gmdate( $format, 0 );
+		$string_time = gmmktime( $matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1] );
+		$string_gmt = gmdate( $format, $string_time - get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
+	}
+	return $string_gmt;
+}
+
+/**
+ * Converts a GMT date into the correct format for the blog.
+ *
+ * Requires and returns a date in the Y-m-d H:i:s format. If there is a
+ * timezone_string available, the returned date is in that timezone, otherwise
+ * it simply adds the value of gmt_offset. Return format can be overridden
+ * using the $format parameter
+ *
+ * @since 1.2.0
+ *
+ * @param string $string The date to be converted.
+ * @param string $format The format string for the returned date (default is Y-m-d H:i:s)
+ * @return string Formatted date relative to the timezone / GMT offset.
+ */
+function get_date_from_gmt( $string, $format = 'Y-m-d H:i:s' ) {
+	$tz = get_option( 'timezone_string' );
+	if ( $tz ) {
+		$datetime = date_create( $string, new DateTimeZone( 'UTC' ) );
+		if ( ! $datetime )
+			return date( $format, 0 );
+		$datetime->setTimezone( new DateTimeZone( $tz ) );
+		$string_localtime = $datetime->format( $format );
+	} else {
+		if ( ! preg_match('#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches) )
+			return date( $format, 0 );
+		$string_time = gmmktime( $matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1] );
+		$string_localtime = gmdate( $format, $string_time + get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
+	}
+	return $string_localtime;
+}
+
+/**
+ * Computes an offset in seconds from an iso8601 timezone.
+ *
+ * @since 1.5.0
+ *
+ * @param string $timezone Either 'Z' for 0 offset or '±hhmm'.
+ * @return int|float The offset in seconds.
+ */
+function iso8601_timezone_to_offset($timezone) {
+	// $timezone is either 'Z' or '[+|-]hhmm'
+	if ($timezone == 'Z') {
+		$offset = 0;
+	} else {
+		$sign    = (substr($timezone, 0, 1) == '+') ? 1 : -1;
+		$hours   = intval(substr($timezone, 1, 2));
+		$minutes = intval(substr($timezone, 3, 4)) / 60;
+		$offset  = $sign * HOUR_IN_SECONDS * ($hours + $minutes);
+	}
+	return $offset;
+}
+
+/**
+ * Converts an iso8601 date to MySQL DateTime format used by post_date[_gmt].
+ *
+ * @since 1.5.0
+ *
+ * @param string $date_string Date and time in ISO 8601 format {@link http://en.wikipedia.org/wiki/ISO_8601}.
+ * @param string $timezone Optional. If set to GMT returns the time minus gmt_offset. Default is 'user'.
+ * @return string The date and time in MySQL DateTime format - Y-m-d H:i:s.
+ */
+function iso8601_to_datetime($date_string, $timezone = 'user') {
+	$timezone = strtolower($timezone);
+
+	if ($timezone == 'gmt') {
+
+		preg_match('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[\+|\-][0-9]{2,4}){0,1}#', $date_string, $date_bits);
+
+		if (!empty($date_bits[7])) { // we have a timezone, so let's compute an offset
+			$offset = iso8601_timezone_to_offset($date_bits[7]);
+		} else { // we don't have a timezone, so we assume user local timezone (not server's!)
+			$offset = HOUR_IN_SECONDS * get_option('gmt_offset');
+		}
+
+		$timestamp = gmmktime($date_bits[4], $date_bits[5], $date_bits[6], $date_bits[2], $date_bits[3], $date_bits[1]);
+		$timestamp -= $offset;
+
+		return gmdate('Y-m-d H:i:s', $timestamp);
+
+	} else if ($timezone == 'user') {
+		return preg_replace('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[\+|\-][0-9]{2,4}){0,1}#', '$1-$2-$3 $4:$5:$6', $date_string);
+	}
+}
+
+/**
+ * Adds a element attributes to open links in new windows.
+ *
+ * Comment text in popup windows should be filtered through this. Right now it's
+ * a moderately dumb function, ideally it would detect whether a target or rel
+ * attribute was already there and adjust its actions accordingly.
+ *
+ * @since 0.71
+ *
+ * @param string $text Content to replace links to open in a new window.
+ * @return string Content that has filtered links.
+ */
+function popuplinks($text) {
+	$text = preg_replace('/<a (.+?)>/i', "<a $1 target='_blank' rel='external'>", $text);
+	return $text;
+}
+
+/**
+ * Strips out all characters that are not allowable in an email.
+ *
+ * @since 1.5.0
+ *
+ * @param string $email Email address to filter.
+ * @return string Filtered email address.
+ */
+function sanitize_email( $email ) {
+	// Test for the minimum length the email can be
+	if ( strlen( $email ) < 3 ) {
+		return apply_filters( 'sanitize_email', '', $email, 'email_too_short' );
+	}
+
+	// Test for an @ character after the first position
+	if ( strpos( $email, '@', 1 ) === false ) {
+		return apply_filters( 'sanitize_email', '', $email, 'email_no_at' );
+	}
+
+	// Split out the local and domain parts
+	list( $local, $domain ) = explode( '@', $email, 2 );
+
+	// LOCAL PART
+	// Test for invalid characters
+	$local = preg_replace( '/[^a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]/', '', $local );
+	if ( '' === $local ) {
+		return apply_filters( 'sanitize_email', '', $email, 'local_invalid_chars' );
+	}
+
+	// DOMAIN PART
+	// Test for sequences of periods
+	$domain = preg_replace( '/\.{2,}/', '', $domain );
+	if ( '' === $domain ) {
+		return apply_filters( 'sanitize_email', '', $email, 'domain_period_sequence' );
+	}
+
+	// Test for leading and trailing periods and whitespace
+	$domain = trim( $domain, " \t\n\r\0\x0B." );
+	if ( '' === $domain ) {
+		return apply_filters( 'sanitize_email', '', $email, 'domain_period_limits' );
+	}
+
+	// Split the domain into subs
+	$subs = explode( '.', $domain );
+
+	// Assume the domain will have at least two subs
+	if ( 2 > count( $subs ) ) {
+		return apply_filters( 'sanitize_email', '', $email, 'domain_no_periods' );
+	}
+
+	// Create an array that will contain valid subs
+	$new_subs = array();
+
+	// Loop through each sub
+	foreach ( $subs as $sub ) {
+		// Test for leading and trailing hyphens
+		$sub = trim( $sub, " \t\n\r\0\x0B-" );
+
+		// Test for invalid characters
+		$sub = preg_replace( '/[^a-z0-9-]+/i', '', $sub );
+
+		// If there's anything left, add it to the valid subs
+		if ( '' !== $sub ) {
+			$new_subs[] = $sub;
+		}
+	}
+
+	// If there aren't 2 or more valid subs
+	if ( 2 > count( $new_subs ) ) {
+		return apply_filters( 'sanitize_email', '', $email, 'domain_no_valid_subs' );
+	}
+
+	// Join valid subs into the new domain
+	$domain = join( '.', $new_subs );
+
+	// Put the email back together
+	$email = $local . '@' . $domain;
+
+	// Congratulations your email made it!
+	return apply_filters( 'sanitize_email', $email, $email, null );
+}
+
+/**
+ * Determines the difference between two timestamps.
+ *
+ * The difference is returned in a human readable format such as "1 hour",
+ * "5 mins", "2 days".
+ *
+ * @since 1.5.0
+ *
+ * @param int $from Unix timestamp from which the difference begins.
+ * @param int $to Optional. Unix timestamp to end the time difference. Default becomes time() if not set.
+ * @return string Human readable time difference.
+ */
+function human_time_diff( $from, $to = '' ) {
+	if ( empty( $to ) )
+		$to = time();
+
+	$diff = (int) abs( $to - $from );
+
+	if ( $diff < HOUR_IN_SECONDS ) {
+		$mins = round( $diff / MINUTE_IN_SECONDS );
+		if ( $mins <= 1 )
+			$mins = 1;
+		/* translators: min=minute */
+		$since = sprintf( _n( '%s min', '%s mins', $mins ), $mins );
+	} elseif ( $diff < DAY_IN_SECONDS && $diff >= HOUR_IN_SECONDS ) {
+		$hours = round( $diff / HOUR_IN_SECONDS );
+		if ( $hours <= 1 )
+			$hours = 1;
+		$since = sprintf( _n( '%s hour', '%s hours', $hours ), $hours );
+	} elseif ( $diff < WEEK_IN_SECONDS && $diff >= DAY_IN_SECONDS ) {
+		$days = round( $diff / DAY_IN_SECONDS );
+		if ( $days <= 1 )
+			$days = 1;
+		$since = sprintf( _n( '%s day', '%s days', $days ), $days );
+	} elseif ( $diff < 30 * DAY_IN_SECONDS && $diff >= WEEK_IN_SECONDS ) {
+		$weeks = round( $diff / WEEK_IN_SECONDS );
+		if ( $weeks <= 1 )
+			$weeks = 1;
+		$since = sprintf( _n( '%s week', '%s weeks', $weeks ), $weeks );
+	} elseif ( $diff < YEAR_IN_SECONDS && $diff >= 30 * DAY_IN_SECONDS ) {
+		$months = round( $diff / ( 30 * DAY_IN_SECONDS ) );
+		if ( $months <= 1 )
+			$months = 1;
+		$since = sprintf( _n( '%s month', '%s months', $months ), $months );
+	} elseif ( $diff >= YEAR_IN_SECONDS ) {
+		$years = round( $diff / YEAR_IN_SECONDS );
+		if ( $years <= 1 )
+			$years = 1;
+		$since = sprintf( _n( '%s year', '%s years', $years ), $years );
+	}
+
+	return $since;
+}
+
+/**
+ * Generates an excerpt from the content, if needed.
+ *
+ * The excerpt word amount will be 55 words and if the amount is greater than
+ * that, then the string ' […]' will be appended to the excerpt. If the string
+ * is less than 55 words, then the content will be returned as is.
+ *
+ * The 55 word limit can be modified by plugins/themes using the excerpt_length filter
+ * The ' […]' string can be modified by plugins/themes using the excerpt_more filter
+ *
+ * @since 1.5.0
+ *
+ * @param string $text Optional. The excerpt. If set to empty, an excerpt is generated.
+ * @return string The excerpt.
+ */
+function wp_trim_excerpt($text = '') {
+	$raw_excerpt = $text;
+	if ( '' == $text ) {
+		$text = get_the_content('');
+
+		$text = strip_shortcodes( $text );
+
+		$text = apply_filters('the_content', $text);
+		$text = str_replace(']]>', ']]>', $text);
+		$excerpt_length = apply_filters('excerpt_length', 55);
+		$excerpt_more = apply_filters('excerpt_more', ' ' . '[…]');
+		$text = wp_trim_words( $text, $excerpt_length, $excerpt_more );
+	}
+	return apply_filters('wp_trim_excerpt', $text, $raw_excerpt);
+}
+
+/**
+ * Trims text to a certain number of words.
+ *
+ * This function is localized. For languages that count 'words' by the individual
+ * character (such as East Asian languages), the $num_words argument will apply
+ * to the number of individual characters.
+ *
+ * @since 3.3.0
+ *
+ * @param string $text Text to trim.
+ * @param int $num_words Number of words. Default 55.
+ * @param string $more Optional. What to append if $text needs to be trimmed. Default '…'.
+ * @return string Trimmed text.
+ */
+function wp_trim_words( $text, $num_words = 55, $more = null ) {
+	if ( null === $more )
+		$more = __( '…' );
+	$original_text = $text;
+	$text = wp_strip_all_tags( $text );
+	/* translators: If your word count is based on single characters (East Asian characters),
+	   enter 'characters'. Otherwise, enter 'words'. Do not translate into your own language. */
+	if ( 'characters' == _x( 'words', 'word count: words or characters?' ) && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {
+		$text = trim( preg_replace( "/[\n\r\t ]+/", ' ', $text ), ' ' );
+		preg_match_all( '/./u', $text, $words_array );
+		$words_array = array_slice( $words_array[0], 0, $num_words + 1 );
+		$sep = '';
+	} else {
+		$words_array = preg_split( "/[\n\r\t ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY );
+		$sep = ' ';
+	}
+	if ( count( $words_array ) > $num_words ) {
+		array_pop( $words_array );
+		$text = implode( $sep, $words_array );
+		$text = $text . $more;
+	} else {
+		$text = implode( $sep, $words_array );
+	}
+	return apply_filters( 'wp_trim_words', $text, $num_words, $more, $original_text );
+}
+
+/**
+ * Converts named entities into numbered entities.
+ *
+ * @since 1.5.1
+ *
+ * @param string $text The text within which entities will be converted.
+ * @return string Text with converted entities.
+ */
+function ent2ncr($text) {
+
+	// Allow a plugin to short-circuit and override the mappings.
+	$filtered = apply_filters( 'pre_ent2ncr', null, $text );
+	if( null !== $filtered )
+		return $filtered;
+
+	$to_ncr = array(
+		'"' => '"',
+		'&' => '&',
+		'<' => '<',
+		'>' => '>',
+		'|' => '|',
+		' ' => ' ',
+		'¡' => '¡',
+		'¢' => '¢',
+		'£' => '£',
+		'¤' => '¤',
+		'¥' => '¥',
+		'¦' => '¦',
+		'&brkbar;' => '¦',
+		'§' => '§',
+		'¨' => '¨',
+		'¨' => '¨',
+		'©' => '©',
+		'ª' => 'ª',
+		'«' => '«',
+		'¬' => '¬',
+		'' => '',
+		'®' => '®',
+		'¯' => '¯',
+		'&hibar;' => '¯',
+		'°' => '°',
+		'±' => '±',
+		'²' => '²',
+		'³' => '³',
+		'´' => '´',
+		'µ' => 'µ',
+		'¶' => '¶',
+		'·' => '·',
+		'¸' => '¸',
+		'¹' => '¹',
+		'º' => 'º',
+		'»' => '»',
+		'¼' => '¼',
+		'½' => '½',
+		'¾' => '¾',
+		'¿' => '¿',
+		'À' => 'À',
+		'Á' => 'Á',
+		'Â' => 'Â',
+		'Ã' => 'Ã',
+		'Ä' => 'Ä',
+		'Å' => 'Å',
+		'Æ' => 'Æ',
+		'Ç' => 'Ç',
+		'È' => 'È',
+		'É' => 'É',
+		'Ê' => 'Ê',
+		'Ë' => 'Ë',
+		'Ì' => 'Ì',
+		'Í' => 'Í',
+		'Î' => 'Î',
+		'Ï' => 'Ï',
+		'Ð' => 'Ð',
+		'Ñ' => 'Ñ',
+		'Ò' => 'Ò',
+		'Ó' => 'Ó',
+		'Ô' => 'Ô',
+		'Õ' => 'Õ',
+		'Ö' => 'Ö',
+		'×' => '×',
+		'Ø' => 'Ø',
+		'Ù' => 'Ù',
+		'Ú' => 'Ú',
+		'Û' => 'Û',
+		'Ü' => 'Ü',
+		'Ý' => 'Ý',
+		'Þ' => 'Þ',
+		'ß' => 'ß',
+		'à' => 'à',
+		'á' => 'á',
+		'â' => 'â',
+		'ã' => 'ã',
+		'ä' => 'ä',
+		'å' => 'å',
+		'æ' => 'æ',
+		'ç' => 'ç',
+		'è' => 'è',
+		'é' => 'é',
+		'ê' => 'ê',
+		'ë' => 'ë',
+		'ì' => 'ì',
+		'í' => 'í',
+		'î' => 'î',
+		'ï' => 'ï',
+		'ð' => 'ð',
+		'ñ' => 'ñ',
+		'ò' => 'ò',
+		'ó' => 'ó',
+		'ô' => 'ô',
+		'õ' => 'õ',
+		'ö' => 'ö',
+		'÷' => '÷',
+		'ø' => 'ø',
+		'ù' => 'ù',
+		'ú' => 'ú',
+		'û' => 'û',
+		'ü' => 'ü',
+		'ý' => 'ý',
+		'þ' => 'þ',
+		'ÿ' => 'ÿ',
+		'Œ' => 'Œ',
+		'œ' => 'œ',
+		'Š' => 'Š',
+		'š' => 'š',
+		'Ÿ' => 'Ÿ',
+		'ƒ' => 'ƒ',
+		'ˆ' => 'ˆ',
+		'˜' => '˜',
+		'Α' => 'Α',
+		'Β' => 'Β',
+		'Γ' => 'Γ',
+		'Δ' => 'Δ',
+		'Ε' => 'Ε',
+		'Ζ' => 'Ζ',
+		'Η' => 'Η',
+		'Θ' => 'Θ',
+		'Ι' => 'Ι',
+		'Κ' => 'Κ',
+		'Λ' => 'Λ',
+		'Μ' => 'Μ',
+		'Ν' => 'Ν',
+		'Ξ' => 'Ξ',
+		'Ο' => 'Ο',
+		'Π' => 'Π',
+		'Ρ' => 'Ρ',
+		'Σ' => 'Σ',
+		'Τ' => 'Τ',
+		'Υ' => 'Υ',
+		'Φ' => 'Φ',
+		'Χ' => 'Χ',
+		'Ψ' => 'Ψ',
+		'Ω' => 'Ω',
+		'α' => 'α',
+		'β' => 'β',
+		'γ' => 'γ',
+		'δ' => 'δ',
+		'ε' => 'ε',
+		'ζ' => 'ζ',
+		'η' => 'η',
+		'θ' => 'θ',
+		'ι' => 'ι',
+		'κ' => 'κ',
+		'λ' => 'λ',
+		'μ' => 'μ',
+		'ν' => 'ν',
+		'ξ' => 'ξ',
+		'ο' => 'ο',
+		'π' => 'π',
+		'ρ' => 'ρ',
+		'ς' => 'ς',
+		'σ' => 'σ',
+		'τ' => 'τ',
+		'υ' => 'υ',
+		'φ' => 'φ',
+		'χ' => 'χ',
+		'ψ' => 'ψ',
+		'ω' => 'ω',
+		'ϑ' => 'ϑ',
+		'ϒ' => 'ϒ',
+		'ϖ' => 'ϖ',
+		' ' => ' ',
+		' ' => ' ',
+		' ' => ' ',
+		'‌' => '‌',
+		'‍' => '‍',
+		'‎' => '‎',
+		'‏' => '‏',
+		'–' => '–',
+		'—' => '—',
+		'‘' => '‘',
+		'’' => '’',
+		'‚' => '‚',
+		'“' => '“',
+		'”' => '”',
+		'„' => '„',
+		'†' => '†',
+		'‡' => '‡',
+		'•' => '•',
+		'…' => '…',
+		'‰' => '‰',
+		'′' => '′',
+		'″' => '″',
+		'‹' => '‹',
+		'›' => '›',
+		'‾' => '‾',
+		'⁄' => '⁄',
+		'€' => '€',
+		'ℑ' => 'ℑ',
+		'℘' => '℘',
+		'ℜ' => 'ℜ',
+		'™' => '™',
+		'ℵ' => 'ℵ',
+		'↵' => '↵',
+		'⇐' => '⇐',
+		'⇑' => '⇑',
+		'⇒' => '⇒',
+		'⇓' => '⇓',
+		'⇔' => '⇔',
+		'∀' => '∀',
+		'∂' => '∂',
+		'∃' => '∃',
+		'∅' => '∅',
+		'∇' => '∇',
+		'∈' => '∈',
+		'∉' => '∉',
+		'∋' => '∋',
+		'∏' => '∏',
+		'∑' => '∑',
+		'−' => '−',
+		'∗' => '∗',
+		'√' => '√',
+		'∝' => '∝',
+		'∞' => '∞',
+		'∠' => '∠',
+		'∧' => '∧',
+		'∨' => '∨',
+		'∩' => '∩',
+		'∪' => '∪',
+		'∫' => '∫',
+		'∴' => '∴',
+		'∼' => '∼',
+		'≅' => '≅',
+		'≈' => '≈',
+		'≠' => '≠',
+		'≡' => '≡',
+		'≤' => '≤',
+		'≥' => '≥',
+		'⊂' => '⊂',
+		'⊃' => '⊃',
+		'⊄' => '⊄',
+		'⊆' => '⊆',
+		'⊇' => '⊇',
+		'⊕' => '⊕',
+		'⊗' => '⊗',
+		'⊥' => '⊥',
+		'⋅' => '⋅',
+		'⌈' => '⌈',
+		'⌉' => '⌉',
+		'⌊' => '⌊',
+		'⌋' => '⌋',
+		'⟨' => '〈',
+		'⟩' => '〉',
+		'←' => '←',
+		'↑' => '↑',
+		'→' => '→',
+		'↓' => '↓',
+		'↔' => '↔',
+		'◊' => '◊',
+		'♠' => '♠',
+		'♣' => '♣',
+		'♥' => '♥',
+		'♦' => '♦'
+	);
+
+	return str_replace( array_keys($to_ncr), array_values($to_ncr), $text );
+}
+
+/**
+ * Formats text for the rich text editor.
+ *
+ * The filter 'richedit_pre' is applied here. If $text is empty the filter will
+ * be applied to an empty string.
+ *
+ * @since 2.0.0
+ *
+ * @param string $text The text to be formatted.
+ * @return string The formatted text after filter is applied.
+ */
+function wp_richedit_pre($text) {
+	// Filtering a blank results in an annoying <br />\n
+	if ( empty($text) ) return apply_filters('richedit_pre', '');
+
+	$output = convert_chars($text);
+	$output = wpautop($output);
+	$output = htmlspecialchars($output, ENT_NOQUOTES, get_option( 'blog_charset' ) );
+
+	return apply_filters('richedit_pre', $output);
+}
+
+/**
+ * Formats text for the HTML editor.
+ *
+ * Unless $output is empty it will pass through htmlspecialchars before the
+ * 'htmledit_pre' filter is applied.
+ *
+ * @since 2.5.0
+ *
+ * @param string $output The text to be formatted.
+ * @return string Formatted text after filter applied.
+ */
+function wp_htmledit_pre($output) {
+	if ( !empty($output) )
+		$output = htmlspecialchars($output, ENT_NOQUOTES, get_option( 'blog_charset' ) ); // convert only < > &
+
+	return apply_filters('htmledit_pre', $output);
+}
+
+/**
+ * Perform a deep string replace operation to ensure the values in $search are no longer present
+ *
+ * Repeats the replacement operation until it no longer replaces anything so as to remove "nested" values
+ * e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that
+ * str_replace would return
+ *
+ * @since 2.8.1
+ * @access private
+ *
+ * @param string|array $search The value being searched for, otherwise known as the needle. An array may be used to designate multiple needles.
+ * @param string $subject The string being searched and replaced on, otherwise known as the haystack.
+ * @return string The string with the replaced svalues.
+ */
+function _deep_replace( $search, $subject ) {
+	$subject = (string) $subject;
+
+	$count = 1;
+	while ( $count ) {
+		$subject = str_replace( $search, '', $subject, $count );
+	}
+
+	return $subject;
+}
+
+/**
+ * Escapes data for use in a MySQL query.
+ *
+ * Usually you should prepare queries using wpdb::prepare().
+ * Sometimes, spot-escaping is required or useful. One example
+ * is preparing an array for use in an IN clause.
+ *
+ * @since 2.8.0
+ * @param string|array $data Unescaped data
+ * @return string|array Escaped data
+ */
+function esc_sql( $data ) {
+	global $wpdb;
+	return $wpdb->_escape( $data );
+}
+
+/**
+ * Checks and cleans a URL.
+ *
+ * A number of characters are removed from the URL. If the URL is for displaying
+ * (the default behaviour) ampersands are also replaced. The 'clean_url' filter
+ * is applied to the returned cleaned URL.
+ *
+ * @since 2.8.0
+ * @uses wp_kses_bad_protocol() To only permit protocols in the URL set
+ *		via $protocols or the common ones set in the function.
+ *
+ * @param string $url The URL to be cleaned.
+ * @param array $protocols Optional. An array of acceptable protocols.
+ *		Defaults to 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn' if not set.
+ * @param string $_context Private. Use esc_url_raw() for database usage.
+ * @return string The cleaned $url after the 'clean_url' filter is applied.
+ */
+function esc_url( $url, $protocols = null, $_context = 'display' ) {
+	$original_url = $url;
+
+	if ( '' == $url )
+		return $url;
+	$url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url);
+	$strip = array('%0d', '%0a', '%0D', '%0A');
+	$url = _deep_replace($strip, $url);
+	$url = str_replace(';//', '://', $url);
+	/* If the URL doesn't appear to contain a scheme, we
+	 * presume it needs http:// appended (unless a relative
+	 * link starting with /, # or ? or a php file).
+	 */
+	if ( strpos($url, ':') === false && ! in_array( $url[0], array( '/', '#', '?' ) ) &&
+		! preg_match('/^[a-z0-9-]+?\.php/i', $url) )
+		$url = 'http://' . $url;
+
+	// Replace ampersands and single quotes only when displaying.
+	if ( 'display' == $_context ) {
+		$url = wp_kses_normalize_entities( $url );
+		$url = str_replace( '&', '&', $url );
+		$url = str_replace( "'", ''', $url );
+	}
+
+	if ( '/' === $url[0] ) {
+		$good_protocol_url = $url;
+	} else {
+		if ( ! is_array( $protocols ) )
+			$protocols = wp_allowed_protocols();
+		$good_protocol_url = wp_kses_bad_protocol( $url, $protocols );
+		if ( strtolower( $good_protocol_url ) != strtolower( $url ) )
+			return '';
+	}
+
+	return apply_filters('clean_url', $good_protocol_url, $original_url, $_context);
+}
+
+/**
+ * Performs esc_url() for database usage.
+ *
+ * @since 2.8.0
+ * @uses esc_url()
+ *
+ * @param string $url The URL to be cleaned.
+ * @param array $protocols An array of acceptable protocols.
+ * @return string The cleaned URL.
+ */
+function esc_url_raw( $url, $protocols = null ) {
+	return esc_url( $url, $protocols, 'db' );
+}
+
+/**
+ * Convert entities, while preserving already-encoded entities.
+ *
+ * @link http://www.php.net/htmlentities Borrowed from the PHP Manual user notes.
+ *
+ * @since 1.2.2
+ *
+ * @param string $myHTML The text to be converted.
+ * @return string Converted text.
+ */
+function htmlentities2($myHTML) {
+	$translation_table = get_html_translation_table( HTML_ENTITIES, ENT_QUOTES );
+	$translation_table[chr(38)] = '&';
+	return preg_replace( "/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,3};)/", "&", strtr($myHTML, $translation_table) );
+}
+
+/**
+ * Escape single quotes, htmlspecialchar " < > &, and fix line endings.
+ *
+ * Escapes text strings for echoing in JS. It is intended to be used for inline JS
+ * (in a tag attribute, for example onclick="..."). Note that the strings have to
+ * be in single quotes. The filter 'js_escape' is also applied here.
+ *
+ * @since 2.8.0
+ *
+ * @param string $text The text to be escaped.
+ * @return string Escaped text.
+ */
+function esc_js( $text ) {
+	$safe_text = wp_check_invalid_utf8( $text );
+	$safe_text = _wp_specialchars( $safe_text, ENT_COMPAT );
+	$safe_text = preg_replace( '/&#(x)?0*(?(1)27|39);?/i', "'", stripslashes( $safe_text ) );
+	$safe_text = str_replace( "\r", '', $safe_text );
+	$safe_text = str_replace( "\n", '\\n', addslashes( $safe_text ) );
+	return apply_filters( 'js_escape', $safe_text, $text );
+}
+
+/**
+ * Escaping for HTML blocks.
+ *
+ * @since 2.8.0
+ *
+ * @param string $text
+ * @return string
+ */
+function esc_html( $text ) {
+	$safe_text = wp_check_invalid_utf8( $text );
+	$safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
+	return apply_filters( 'esc_html', $safe_text, $text );
+}
+
+/**
+ * Escaping for HTML attributes.
+ *
+ * @since 2.8.0
+ *
+ * @param string $text
+ * @return string
+ */
+function esc_attr( $text ) {
+	$safe_text = wp_check_invalid_utf8( $text );
+	$safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
+	return apply_filters( 'attribute_escape', $safe_text, $text );
+}
+
+/**
+ * Escaping for textarea values.
+ *
+ * @since 3.1.0
+ *
+ * @param string $text
+ * @return string
+ */
+function esc_textarea( $text ) {
+	$safe_text = htmlspecialchars( $text, ENT_QUOTES, get_option( 'blog_charset' ) );
+	return apply_filters( 'esc_textarea', $safe_text, $text );
+}
+
+/**
+ * Escape an HTML tag name.
+ *
+ * @since 2.5.0
+ *
+ * @param string $tag_name
+ * @return string
+ */
+function tag_escape($tag_name) {
+	$safe_tag = strtolower( preg_replace('/[^a-zA-Z0-9_:]/', '', $tag_name) );
+	return apply_filters('tag_escape', $safe_tag, $tag_name);
+}
+
+/**
+ * Escapes text for SQL LIKE special characters % and _.
+ *
+ * @since 2.5.0
+ *
+ * @param string $text The text to be escaped.
+ * @return string text, safe for inclusion in LIKE query.
+ */
+function like_escape($text) {
+	return str_replace(array("%", "_"), array("\\%", "\\_"), $text);
+}
+
+/**
+ * Convert full URL paths to absolute paths.
+ *
+ * Removes the http or https protocols and the domain. Keeps the path '/' at the
+ * beginning, so it isn't a true relative link, but from the web root base.
+ *
+ * @since 2.1.0
+ *
+ * @param string $link Full URL path.
+ * @return string Absolute path.
+ */
+function wp_make_link_relative( $link ) {
+	return preg_replace( '|https?://[^/]+(/.*)|i', '$1', $link );
+}
+
+/**
+ * Sanitises various option values based on the nature of the option.
+ *
+ * This is basically a switch statement which will pass $value through a number
+ * of functions depending on the $option.
+ *
+ * @since 2.0.5
+ *
+ * @param string $option The name of the option.
+ * @param string $value The unsanitised value.
+ * @return string Sanitized value.
+ */
+function sanitize_option($option, $value) {
+
+	switch ( $option ) {
+		case 'admin_email' :
+		case 'new_admin_email' :
+			$value = sanitize_email( $value );
+			if ( ! is_email( $value ) ) {
+				$value = get_option( $option ); // Resets option to stored value in the case of failed sanitization
+				if ( function_exists( 'add_settings_error' ) )
+					add_settings_error( $option, 'invalid_admin_email', __( 'The email address entered did not appear to be a valid email address. Please enter a valid email address.' ) );
+			}
+			break;
+
+		case 'thumbnail_size_w':
+		case 'thumbnail_size_h':
+		case 'medium_size_w':
+		case 'medium_size_h':
+		case 'large_size_w':
+		case 'large_size_h':
+		case 'mailserver_port':
+		case 'comment_max_links':
+		case 'page_on_front':
+		case 'page_for_posts':
+		case 'rss_excerpt_length':
+		case 'default_category':
+		case 'default_email_category':
+		case 'default_link_category':
+		case 'close_comments_days_old':
+		case 'comments_per_page':
+		case 'thread_comments_depth':
+		case 'users_can_register':
+		case 'start_of_week':
+			$value = absint( $value );
+			break;
+
+		case 'posts_per_page':
+		case 'posts_per_rss':
+			$value = (int) $value;
+			if ( empty($value) )
+				$value = 1;
+			if ( $value < -1 )
+				$value = abs($value);
+			break;
+
+		case 'default_ping_status':
+		case 'default_comment_status':
+			// Options that if not there have 0 value but need to be something like "closed"
+			if ( $value == '0' || $value == '')
+				$value = 'closed';
+			break;
+
+		case 'blogdescription':
+		case 'blogname':
+			$value = wp_kses_post( $value );
+			$value = esc_html( $value );
+			break;
+
+		case 'blog_charset':
+			$value = preg_replace('/[^a-zA-Z0-9_-]/', '', $value); // strips slashes
+			break;
+
+		case 'blog_public':
+			// This is the value if the settings checkbox is not checked on POST. Don't rely on this.
+			if ( null === $value )
+				$value = 1;
+			else
+				$value = intval( $value );
+			break;
+
+		case 'date_format':
+		case 'time_format':
+		case 'mailserver_url':
+		case 'mailserver_login':
+		case 'mailserver_pass':
+		case 'upload_path':
+			$value = strip_tags( $value );
+			$value = wp_kses_data( $value );
+			break;
+
+		case 'ping_sites':
+			$value = explode( "\n", $value );
+			$value = array_filter( array_map( 'trim', $value ) );
+			$value = array_filter( array_map( 'esc_url_raw', $value ) );
+			$value = implode( "\n", $value );
+			break;
+
+		case 'gmt_offset':
+			$value = preg_replace('/[^0-9:.-]/', '', $value); // strips slashes
+			break;
+
+		case 'siteurl':
+			if ( (bool)preg_match( '#http(s?)://(.+)#i', $value) ) {
+				$value = esc_url_raw($value);
+			} else {
+				$value = get_option( $option ); // Resets option to stored value in the case of failed sanitization
+				if ( function_exists('add_settings_error') )
+					add_settings_error('siteurl', 'invalid_siteurl', __('The WordPress address you entered did not appear to be a valid URL. Please enter a valid URL.'));
+			}
+			break;
+
+		case 'home':
+			if ( (bool)preg_match( '#http(s?)://(.+)#i', $value) ) {
+				$value = esc_url_raw($value);
+			} else {
+				$value = get_option( $option ); // Resets option to stored value in the case of failed sanitization
+				if ( function_exists('add_settings_error') )
+					add_settings_error('home', 'invalid_home', __('The Site address you entered did not appear to be a valid URL. Please enter a valid URL.'));
+			}
+			break;
+
+		case 'WPLANG':
+			$allowed = get_available_languages();
+			if ( ! in_array( $value, $allowed ) && ! empty( $value ) )
+				$value = get_option( $option );
+			break;
+
+		case 'illegal_names':
+			if ( ! is_array( $value ) )
+				$value = explode( ' ', $value );
+
+			$value = array_values( array_filter( array_map( 'trim', $value ) ) );
+
+			if ( ! $value )
+				$value = '';
+			break;
+
+		case 'limited_email_domains':
+		case 'banned_email_domains':
+			if ( ! is_array( $value ) )
+				$value = explode( "\n", $value );
+
+			$domains = array_values( array_filter( array_map( 'trim', $value ) ) );
+			$value = array();
+
+			foreach ( $domains as $domain ) {
+				if ( ! preg_match( '/(--|\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) )
+					$value[] = $domain;
+			}
+			if ( ! $value )
+				$value = '';
+			break;
+
+		case 'timezone_string':
+			$allowed_zones = timezone_identifiers_list();
+			if ( ! in_array( $value, $allowed_zones ) && ! empty( $value ) ) {
+				$value = get_option( $option ); // Resets option to stored value in the case of failed sanitization
+				if ( function_exists('add_settings_error') )
+					add_settings_error('timezone_string', 'invalid_timezone_string', __('The timezone you have entered is not valid. Please select a valid timezone.') );
+			}
+			break;
+
+		case 'permalink_structure':
+		case 'category_base':
+		case 'tag_base':
+			$value = esc_url_raw( $value );
+			$value = str_replace( 'http://', '', $value );
+			break;
+
+		case 'default_role' :
+			if ( ! get_role( $value ) && get_role( 'subscriber' ) )
+				$value = 'subscriber';
+			break;
+	}
+
+	$value = apply_filters("sanitize_option_{$option}", $value, $option);
+
+	return $value;
+}
+
+/**
+ * Parses a string into variables to be stored in an array.
+ *
+ * Uses {@link http://www.php.net/parse_str parse_str()} and stripslashes if
+ * {@link http://www.php.net/magic_quotes magic_quotes_gpc} is on.
+ *
+ * @since 2.2.1
+ * @uses apply_filters() for the 'wp_parse_str' filter.
+ *
+ * @param string $string The string to be parsed.
+ * @param array $array Variables will be stored in this array.
+ */
+function wp_parse_str( $string, &$array ) {
+	parse_str( $string, $array );
+	if ( get_magic_quotes_gpc() )
+		$array = stripslashes_deep( $array );
+	$array = apply_filters( 'wp_parse_str', $array );
+}
+
+/**
+ * Convert lone less than signs.
+ *
+ * KSES already converts lone greater than signs.
+ *
+ * @uses wp_pre_kses_less_than_callback in the callback function.
+ * @since 2.3.0
+ *
+ * @param string $text Text to be converted.
+ * @return string Converted text.
+ */
+function wp_pre_kses_less_than( $text ) {
+	return preg_replace_callback('%<[^>]*?((?=<)|>|$)%', 'wp_pre_kses_less_than_callback', $text);
+}
+
+/**
+ * Callback function used by preg_replace.
+ *
+ * @uses esc_html to format the $matches text.
+ * @since 2.3.0
+ *
+ * @param array $matches Populated by matches to preg_replace.
+ * @return string The text returned after esc_html if needed.
+ */
+function wp_pre_kses_less_than_callback( $matches ) {
+	if ( false === strpos($matches[0], '>') )
+		return esc_html($matches[0]);
+	return $matches[0];
+}
+
+/**
+ * WordPress implementation of PHP sprintf() with filters.
+ *
+ * @since 2.5.0
+ * @link http://www.php.net/sprintf
+ *
+ * @param string $pattern The string which formatted args are inserted.
+ * @param mixed $args,... Arguments to be formatted into the $pattern string.
+ * @return string The formatted string.
+ */
+function wp_sprintf( $pattern ) {
+	$args = func_get_args();
+	$len = strlen($pattern);
+	$start = 0;
+	$result = '';
+	$arg_index = 0;
+	while ( $len > $start ) {
+		// Last character: append and break
+		if ( strlen($pattern) - 1 == $start ) {
+			$result .= substr($pattern, -1);
+			break;
+		}
+
+		// Literal %: append and continue
+		if ( substr($pattern, $start, 2) == '%%' ) {
+			$start += 2;
+			$result .= '%';
+			continue;
+		}
+
+		// Get fragment before next %
+		$end = strpos($pattern, '%', $start + 1);
+		if ( false === $end )
+			$end = $len;
+		$fragment = substr($pattern, $start, $end - $start);
+
+		// Fragment has a specifier
+		if ( $pattern[$start] == '%' ) {
+			// Find numbered arguments or take the next one in order
+			if ( preg_match('/^%(\d+)\$/', $fragment, $matches) ) {
+				$arg = isset($args[$matches[1]]) ? $args[$matches[1]] : '';
+				$fragment = str_replace("%{$matches[1]}$", '%', $fragment);
+			} else {
+				++$arg_index;
+				$arg = isset($args[$arg_index]) ? $args[$arg_index] : '';
+			}
+
+			// Apply filters OR sprintf
+			$_fragment = apply_filters( 'wp_sprintf', $fragment, $arg );
+			if ( $_fragment != $fragment )
+				$fragment = $_fragment;
+			else
+				$fragment = sprintf($fragment, strval($arg) );
+		}
+
+		// Append to result and move to next fragment
+		$result .= $fragment;
+		$start = $end;
+	}
+	return $result;
+}
+
+/**
+ * Localize list items before the rest of the content.
+ *
+ * The '%l' must be at the first characters can then contain the rest of the
+ * content. The list items will have ', ', ', and', and ' and ' added depending
+ * on the amount of list items in the $args parameter.
+ *
+ * @since 2.5.0
+ *
+ * @param string $pattern Content containing '%l' at the beginning.
+ * @param array $args List items to prepend to the content and replace '%l'.
+ * @return string Localized list items and rest of the content.
+ */
+function wp_sprintf_l($pattern, $args) {
+	// Not a match
+	if ( substr($pattern, 0, 2) != '%l' )
+		return $pattern;
+
+	// Nothing to work with
+	if ( empty($args) )
+		return '';
+
+	// Translate and filter the delimiter set (avoid ampersands and entities here)
+	$l = apply_filters('wp_sprintf_l', array(
+		/* translators: used between list items, there is a space after the comma */
+		'between'          => __(', '),
+		/* translators: used between list items, there is a space after the and */
+		'between_last_two' => __(', and '),
+		/* translators: used between only two list items, there is a space after the and */
+		'between_only_two' => __(' and '),
+		));
+
+	$args = (array) $args;
+	$result = array_shift($args);
+	if ( count($args) == 1 )
+		$result .= $l['between_only_two'] . array_shift($args);
+	// Loop when more than two args
+	$i = count($args);
+	while ( $i ) {
+		$arg = array_shift($args);
+		$i--;
+		if ( 0 == $i )
+			$result .= $l['between_last_two'] . $arg;
+		else
+			$result .= $l['between'] . $arg;
+	}
+	return $result . substr($pattern, 2);
+}
+
+/**
+ * Safely extracts not more than the first $count characters from html string.
+ *
+ * UTF-8, tags and entities safe prefix extraction. Entities inside will *NOT*
+ * be counted as one character. For example & will be counted as 4, < as
+ * 3, etc.
+ *
+ * @since 2.5.0
+ *
+ * @param string $str String to get the excerpt from.
+ * @param integer $count Maximum number of characters to take.
+ * @param string $more Optional. What to append if $str needs to be trimmed. Defaults to empty string.
+ * @return string The excerpt.
+ */
+function wp_html_excerpt( $str, $count, $more = null ) {
+	if ( null === $more )
+		$more = '';
+	$str = wp_strip_all_tags( $str, true );
+	$excerpt = mb_substr( $str, 0, $count );
+	// remove part of an entity at the end
+	$excerpt = preg_replace( '/&[^;\s]{0,6}$/', '', $excerpt );
+	if ( $str != $excerpt )
+		$excerpt = trim( $excerpt ) . $more;
+	return $excerpt;
+}
+
+/**
+ * Add a Base url to relative links in passed content.
+ *
+ * By default it supports the 'src' and 'href' attributes. However this can be
+ * changed via the 3rd param.
+ *
+ * @since 2.7.0
+ *
+ * @param string $content String to search for links in.
+ * @param string $base The base URL to prefix to links.
+ * @param array $attrs The attributes which should be processed.
+ * @return string The processed content.
+ */
+function links_add_base_url( $content, $base, $attrs = array('src', 'href') ) {
+	global $_links_add_base;
+	$_links_add_base = $base;
+	$attrs = implode('|', (array)$attrs);
+	return preg_replace_callback( "!($attrs)=(['\"])(.+?)\\2!i", '_links_add_base', $content );
+}
+
+/**
+ * Callback to add a base url to relative links in passed content.
+ *
+ * @since 2.7.0
+ * @access private
+ *
+ * @param string $m The matched link.
+ * @return string The processed link.
+ */
+function _links_add_base($m) {
+	global $_links_add_base;
+	//1 = attribute name  2 = quotation mark  3 = URL
+	return $m[1] . '=' . $m[2] .
+		( preg_match( '#^(\w{1,20}):#', $m[3], $protocol ) && in_array( $protocol[1], wp_allowed_protocols() ) ?
+			$m[3] :
+			path_join( $_links_add_base, $m[3] ) )
+		. $m[2];
+}
+
+/**
+ * Adds a Target attribute to all links in passed content.
+ *
+ * This function by default only applies to <a> tags, however this can be
+ * modified by the 3rd param.
+ *
+ * <b>NOTE:</b> Any current target attributed will be stripped and replaced.
+ *
+ * @since 2.7.0
+ *
+ * @param string $content String to search for links in.
+ * @param string $target The Target to add to the links.
+ * @param array $tags An array of tags to apply to.
+ * @return string The processed content.
+ */
+function links_add_target( $content, $target = '_blank', $tags = array('a') ) {
+	global $_links_add_target;
+	$_links_add_target = $target;
+	$tags = implode('|', (array)$tags);
+	return preg_replace_callback( "!<($tags)(.+?)>!i", '_links_add_target', $content );
+}
+
+/**
+ * Callback to add a target attribute to all links in passed content.
+ *
+ * @since 2.7.0
+ * @access private
+ *
+ * @param string $m The matched link.
+ * @return string The processed link.
+ */
+function _links_add_target( $m ) {
+	global $_links_add_target;
+	$tag = $m[1];
+	$link = preg_replace('|(target=([\'"])(.*?)\2)|i', '', $m[2]);
+	return '<' . $tag . $link . ' target="' . esc_attr( $_links_add_target ) . '">';
+}
+
+/**
+ * Normalize EOL characters and strip duplicate whitespace.
+ *
+ * @since 2.7.0
+ *
+ * @param string $str The string to normalize.
+ * @return string The normalized string.
+ */
+function normalize_whitespace( $str ) {
+	$str  = trim( $str );
+	$str  = str_replace( "\r", "\n", $str );
+	$str  = preg_replace( array( '/\n+/', '/[ \t]+/' ), array( "\n", ' ' ), $str );
+	return $str;
+}
+
+/**
+ * Properly strip all HTML tags including script and style
+ *
+ * @since 2.9.0
+ *
+ * @param string $string String containing HTML tags
+ * @param bool $remove_breaks optional Whether to remove left over line breaks and white space chars
+ * @return string The processed string.
+ */
+function wp_strip_all_tags($string, $remove_breaks = false) {
+	$string = preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $string );
+	$string = strip_tags($string);
+
+	if ( $remove_breaks )
+		$string = preg_replace('/[\r\n\t ]+/', ' ', $string);
+
+	return trim( $string );
+}
+
+/**
+ * Sanitize a string from user input or from the db
+ *
+ * check for invalid UTF-8,
+ * Convert single < characters to entity,
+ * strip all tags,
+ * remove line breaks, tabs and extra white space,
+ * strip octets.
+ *
+ * @since 2.9.0
+ *
+ * @param string $str
+ * @return string
+ */
+function sanitize_text_field($str) {
+	$filtered = wp_check_invalid_utf8( $str );
+
+	if ( strpos($filtered, '<') !== false ) {
+		$filtered = wp_pre_kses_less_than( $filtered );
+		// This will strip extra whitespace for us.
+		$filtered = wp_strip_all_tags( $filtered, true );
+	} else {
+		$filtered = trim( preg_replace('/[\r\n\t ]+/', ' ', $filtered) );
+	}
+
+	$found = false;
+	while ( preg_match('/%[a-f0-9]{2}/i', $filtered, $match) ) {
+		$filtered = str_replace($match[0], '', $filtered);
+		$found = true;
+	}
+
+	if ( $found ) {
+		// Strip out the whitespace that may now exist after removing the octets.
+		$filtered = trim( preg_replace('/ +/', ' ', $filtered) );
+	}
+
+	return apply_filters('sanitize_text_field', $filtered, $str);
+}
+
+/**
+ * i18n friendly version of basename()
+ *
+ * @since 3.1.0
+ *
+ * @param string $path A path.
+ * @param string $suffix If the filename ends in suffix this will also be cut off.
+ * @return string
+ */
+function wp_basename( $path, $suffix = '' ) {
+	return urldecode( basename( str_replace( array( '%2F', '%5C' ), '/', urlencode( $path ) ), $suffix ) );
+}
+
+/**
+ * Forever eliminate "Wordpress" from the planet (or at least the little bit we can influence).
+ *
+ * Violating our coding standards for a good function name.
+ *
+ * @since 3.0.0
+ */
+function capital_P_dangit( $text ) {
+	// Simple replacement for titles
+	if ( 'the_title' === current_filter() )
+		return str_replace( 'Wordpress', 'WordPress', $text );
+	// Still here? Use the more judicious replacement
+	static $dblq = false;
+	if ( false === $dblq )
+		$dblq = _x( '“', 'opening curly double quote' );
+	return str_replace(
+		array( ' Wordpress', '‘Wordpress', $dblq . 'Wordpress', '>Wordpress', '(Wordpress' ),
+		array( ' WordPress', '‘WordPress', $dblq . 'WordPress', '>WordPress', '(WordPress' ),
+	$text );
+
+}
+
+/**
+ * Sanitize a mime type
+ *
+ * @since 3.1.3
+ *
+ * @param string $mime_type Mime type
+ * @return string Sanitized mime type
+ */
+function sanitize_mime_type( $mime_type ) {
+	$sani_mime_type = preg_replace( '/[^-+*.a-zA-Z0-9\/]/', '', $mime_type );
+	return apply_filters( 'sanitize_mime_type', $sani_mime_type, $mime_type );
+}
+
+/**
+ * Sanitize space or carriage return separated URLs that are used to send trackbacks.
+ *
+ * @since 3.4.0
+ *
+ * @param string $to_ping Space or carriage return separated URLs
+ * @return string URLs starting with the http or https protocol, separated by a carriage return.
+ */
+function sanitize_trackback_urls( $to_ping ) {
+	$urls_to_ping = preg_split( '/[\r\n\t ]/', trim( $to_ping ), -1, PREG_SPLIT_NO_EMPTY );
+	foreach ( $urls_to_ping as $k => $url ) {
+		if ( !preg_match( '#^https?://.#i', $url ) )
+			unset( $urls_to_ping[$k] );
+	}
+	$urls_to_ping = array_map( 'esc_url_raw', $urls_to_ping );
+	$urls_to_ping = implode( "\n", $urls_to_ping );
+	return apply_filters( 'sanitize_trackback_urls', $urls_to_ping, $to_ping );
+}
+
+/**
+ * Add slashes to a string or array of strings.
+ *
+ * This should be used when preparing data for core API that expects slashed data.
+ * This should not be used to escape data going directly into an SQL query.
+ *
+ * @since 3.6.0
+ *
+ * @param string|array $value String or array of strings to slash.
+ * @return string|array Slashed $value
+ */
+function wp_slash( $value ) {
+	if ( is_array( $value ) ) {
+		foreach ( $value as $k => $v ) {
+			if ( is_array( $v ) ) {
+				$value[$k] = wp_slash( $v );
+			} else {
+				$value[$k] = addslashes( $v );
+			}
+		}
+	} else {
+		$value = addslashes( $value );
+	}
+
+	return $value;
+}
+
+/**
+ * Remove slashes from a string or array of strings.
+ *
+ * This should be used to remove slashes from data passed to core API that
+ * expects data to be unslashed.
+ *
+ * @since 3.6.0
+ *
+ * @param string|array $value String or array of strings to unslash.
+ * @return string|array Unslashed $value
+ */
+function wp_unslash( $value ) {
+	return stripslashes_deep( $value );
+}
+
+/**
+ * Extract and return the first URL from passed content.
+ *
+ * @since 3.6.0
+ *
+ * @param string $content A string which might contain a URL.
+ * @return string The found URL.
+ */
+function get_url_in_content( $content ) {
+	if ( empty( $content ) )
+		return '';
+
+	if ( preg_match( '/<a\s[^>]*?href=([\'"])(.+?)\1/is', $content, $matches ) )
+		return esc_url_raw( $matches[2] );
+
+	return false;
+}