> 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 = '') { + // 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' => '', + '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; +} + +/** + * Callback used to change %uXXXX to &#YYY; syntax + * + * @since 2.8? + * + * @param array $matches Single Match + * @return string An HTML entity + */ +function funky_javascript_callback($matches) { + return "&#".base_convert($matches[1],16,10).";"; +} + +/** + * Fixes javascript bugs in browsers. + * + * Converts unicode characters to HTML numbered entities. + * + * @since 1.5.0 + * @uses $is_macIE + * @uses $is_winIE + * + * @param string $text Text to be made safe. + * @return string Fixed text. + */ +function funky_javascript_fix($text) { + // Fixes for browsers' javascript bugs + global $is_macIE, $is_winIE; + + if ( $is_winIE || $is_macIE ) + $text = preg_replace_callback("/\%u([0-9A-F]{4,4})/", + "funky_javascript_callback", + $text); + + return $text; +} + +/** + * Will only balance the tags if forced to and the option is set to balance tags. + * + * The option 'use_balanceTags' is used for whether the tags will be balanced. + * Both the $force parameter and 'use_balanceTags' option will have to be true + * before the tags will be balanced. + * + * @since 0.71 + * + * @param string $text Text to be balanced + * @param bool $force 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') == 0 ) + return $text; + return force_balance_tags( $text ); +} + +/** + * Balances tags of string using a modified stack. + * + * @since 2.0.4 + * + * @author Leonard Lin <leonard@acm.org> + * @license GPL v2.0 + * @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 = ''; + $single_tags = array('br', 'hr', 'img', 'input'); //Known single-entity/self-closing tags + $nestable_tags = array('blockquote', 'div', 'span'); //Tags that can be immediately nested within themselves + + # 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 self-closing or '', don't do anything. + if((substr($regex[2],-1) == '/') || ($tag == '')) { + } + // ElseIf it's a known single-entity tag but it doesn't close itself, do so + elseif ( in_array($tag, $single_tags) ) { + $regex[2] .= '/'; + } else { // Push the tag onto the stack + // If the top of the stack is the same as the tag we want to push, close previous tag + if (($stacksize > 0) && !in_array($tag, $nestable_tags) && ($tagstack[$stacksize - 1] == $tag)) { + $tagqueue = '</' . array_pop ($tagstack) . '>'; + $stacksize--; + } + $stacksize = array_push ($tagstack, $tag); + } + + // Attributes + $attributes = $regex[2]; + if($attributes) { + $attributes = ' '.$attributes; + } + $tag = '<'.$tag.$attributes.'>'; + //If already queuing a close tag, then put this tag on, too + if ($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. + * + * Unless $richedit is set, it is simply a holder for the 'format_to_edit' + * filter. If $richedit is set true htmlspecialchars() will be run on the + * content, converting special characters to HTMl entities. + * + * @since 0.71 + * + * @param string $content The text about to be edited. + * @param bool $richedit Whether or not the $content should pass through htmlspecialchars(). Default false. + * @return string The text after the filter (and possibly htmlspecialchars()) has been run. + */ +function format_to_edit($content, $richedit = false) { + $content = apply_filters('format_to_edit', $content); + if (! $richedit ) + $content = htmlspecialchars($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 number 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) { + $string = preg_replace('/^([0-9])/', '\\\\\\\\\1', $string); + $string = preg_replace('/([a-z])/i', '\\\\\1', $string); + return $string; +} + +/** + * 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) { + global $wpdb; + + if (get_magic_quotes_gpc()) { + $gpc = stripslashes($gpc); + } + + return esc_sql($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 array|string $value The array or string to be striped. + * @return array|string Stripped array (or string in the callback). + */ +function stripslashes_deep($value) { + $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); + return $value; +} + +/** + * Navigates through an array and encodes the values to be used in a URL. + * + * Uses a callback to pass the value of the array back to the function as a + * string. + * + * @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; +} + +/** + * Converts email addresses characters to HTML entities to block spam bots. + * + * @since 0.71 + * + * @param string $emailaddy Email address. + * @param int $mailto Optional. Range from 0 to 1. Used for encoding. + * @return string Converted email address. + */ +function antispambot($emailaddy, $mailto=0) { + $emailNOSPAMaddy = ''; + srand ((float) microtime() * 1000000); + for ($i = 0; $i < strlen($emailaddy); $i = $i + 1) { + $j = floor(rand(0, 1+$mailto)); + if ($j==0) { + $emailNOSPAMaddy .= '&#'.ord(substr($emailaddy,$i,1)).';'; + } elseif ($j==1) { + $emailNOSPAMaddy .= substr($emailaddy,$i,1); + } elseif ($j==2) { + $emailNOSPAMaddy .= '%'.zeroise(dechex(ord(substr($emailaddy, $i, 1))), 2); + } + } + $emailNOSPAMaddy = str_replace('@','@',$emailNOSPAMaddy); + return $emailNOSPAMaddy; +} + +/** + * 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]; + + $url = esc_url($url); + if ( empty($url) ) + return $matches[0]; + + return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>"; +} + +/** + * 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 $ret Content to convert URIs. + * @return string Content with converted URIs. + */ +function make_clickable($ret) { + $ret = ' ' . $ret; + // in testing, using arrays here was found to be faster + $ret = preg_replace_callback('#(?<=[\s>])($)?([\w]+?://(?:[\w\\x80-\\xff\#$%&~/=?@\[\](+-]|[.,;:](?![\s<]|($)?([\s]|$))|(?(1)\)(?![\s<.,;:]|$)|\)))+)#is', '_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); + // this one is not in an array because we need it to run last, for cleanup of accidental links within links + $ret = preg_replace("#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i", "$1$3</a>", $ret); + $ret = trim($ret); + return $ret; +} + +/** + * 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 ) { + global $wpdb; + // 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); + $text = esc_sql($text); + return $text; +} + +/** + * Callback to used 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. + * + * 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 string $smiley Smiley code to convert to image. + * @return string Image string for smiley. + */ +function translate_smiley($smiley) { + global $wpsmiliestrans; + + if (count($smiley) == 0) { + return ''; + } + + $siteurl = get_option( 'siteurl' ); + + $smiley = trim(reset($smiley)); + $img = $wpsmiliestrans[$smiley]; + $smiley_masked = esc_attr($smiley); + + $srcurl = apply_filters('smilies_src', "$siteurl/wp-includes/images/smilies/$img", $img, $siteurl); + + return " <img src='$srcurl' 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 $check_dns Whether to check the DNS for the domain using checkdnsrr(). + * @return string|bool Either false or the valid email address. + */ +function is_email( $email, $check_dns = false ) { + // 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' ); + } + } + + // DNS + // Check the domain has a valid MX and A resource record + if ( $check_dns && function_exists( 'checkdnsrr' ) && !( checkdnsrr( $domain . '.', 'MX' ) || checkdnsrr( $domain . '.', 'A' ) ) ) { + return apply_filters( 'is_email', false, $email, 'dns_no_rr' ); + } + + // Congratulations your email made it! + return apply_filters( 'is_email', $email, $email, null ); +} + +/** + * Convert to ASCII from email subjects. + * + * @since 1.2.0 + * @usedby wp_mail() handles charsets in email subjects + * + * @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]); + $subject = preg_replace_callback('#\=([0-9a-f]{2})#i', create_function('$match', 'return chr(hexdec(strtolower($match[1])));'), $subject); + return $subject; + } +} + +/** + * Returns a date in the GMT equivalent. + * + * Requires and returns a date in the Y-m-d H:i:s format. 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 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') { + 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); + $string_time = gmmktime($matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1]); + $string_gmt = gmdate($format, $string_time - get_option('gmt_offset') * 3600); + return $string_gmt; +} + +/** + * Converts a GMT date into the correct format for the blog. + * + * Requires and returns in the Y-m-d H:i:s format. 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 $format The format string for the returned date (default is Y-m-d H:i:s) + * @return string Formatted date relative to the GMT offset. + */ +function get_date_from_gmt($string, $format = 'Y-m-d H:i:s') { + 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); + $string_time = gmmktime($matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1]); + $string_localtime = gmdate($format, $string_time + get_option('gmt_offset')*3600); + 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 = $sign * 3600 * ($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 = 3600 * 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 <= 3600) { + $mins = round($diff / 60); + if ($mins <= 1) { + $mins = 1; + } + $since = sprintf(_n('%s min', '%s mins', $mins), $mins); + } else if (($diff <= 86400) && ($diff > 3600)) { + $hours = round($diff / 3600); + if ($hours <= 1) { + $hours = 1; + } + $since = sprintf(_n('%s hour', '%s hours', $hours), $hours); + } elseif ($diff >= 86400) { + $days = round($diff / 86400); + if ($days <= 1) { + $days = 1; + } + $since = sprintf(_n('%s day', '%s days', $days), $days); + } + 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 $text The excerpt. If set to empty an excerpt is generated. + * @return string The excerpt. + */ +function wp_trim_excerpt($text) { + $raw_excerpt = $text; + if ( '' == $text ) { + $text = get_the_content(''); + + $text = strip_shortcodes( $text ); + + $text = apply_filters('the_content', $text); + $text = str_replace(']]>', ']]>', $text); + $text = strip_tags($text); + $excerpt_length = apply_filters('excerpt_length', 55); + $excerpt_more = apply_filters('excerpt_more', ' ' . '[...]'); + $words = explode(' ', $text, $excerpt_length + 1); + if (count($words) > $excerpt_length) { + array_pop($words); + $text = implode(' ', $words); + $text = $text . $excerpt_more; + } + } + return apply_filters('wp_trim_excerpt', $text, $raw_excerpt); +} + +/** + * 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) { + $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); + + 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); // convert only < > & + + return apply_filters('htmledit_pre', $output); +} + +/** + * Checks and cleans a URL. + * + * A number of characters are removed from the URL. If the URL is for displaying + * (the default behaviour) amperstands are also replaced. The 'esc_url' filter + * is applied to the returned cleaned URL. + * + * @since 1.2.0 + * @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' if not set. + * @param string $context Optional. How the URL will be used. Default is 'display'. + * @return string The cleaned $url after the 'cleaned_url' filter is applied. + */ +function clean_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(';//', '://', $url); + /* If the URL doesn't appear to contain a scheme, we + * presume it needs http:// appended (unless a relative + * link starting with / or a php file). + */ + if ( strpos($url, ':') === false && + substr( $url, 0, 1 ) != '/' && substr( $url, 0, 1 ) != '#' && !preg_match('/^[a-z0-9-]+?\.php/i', $url) ) + $url = 'http://' . $url; + + // Replace ampersands and single quotes only when displaying. + if ( 'display' == $context ) { + $url = preg_replace('/&([^#])(?![a-z]{2,8};)/', '&$1', $url); + $url = str_replace( "'", ''', $url ); + } + + if ( !is_array($protocols) ) + $protocols = array('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet'); + if ( wp_kses_bad_protocol( $url, $protocols ) != $url ) + return ''; + + return apply_filters('clean_url', $url, $original_url, $context); +} + +/** + * 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 + * @param string $subject + * @return string The processed string + */ +function _deep_replace($search, $subject){ + $found = true; + while($found) { + $found = false; + foreach( (array) $search as $val ) { + while(strpos($subject, $val) !== false) { + $found = true; + $subject = str_replace($val, '', $subject); + } + } + } + + return $subject; +} + +/** + * Escapes data for use in a MySQL query + * + * This is just a handy shortcut for $wpdb->escape(), for completeness' sake + * + * @since 2.8.0 + * @param string $sql Unescaped SQL data + * @return string The cleaned $sql + */ +function esc_sql( $sql ) { + global $wpdb; + return $wpdb->escape( $sql ); +} + + +/** + * Checks and cleans a URL. + * + * A number of characters are removed from the URL. If the URL is for displaying + * (the default behaviour) amperstands are also replaced. The 'esc_url' filter + * is applied to the returned cleaned URL. + * + * @since 2.8.0 + * @uses esc_url() + * @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' if not set. + * @return string The cleaned $url after the 'cleaned_url' filter is applied. + */ +function esc_url( $url, $protocols = null ) { + return clean_url( $url, $protocols, 'display' ); +} + +/** + * Performs esc_url() for database usage. + * + * @see esc_url() + * @see esc_url() + * + * @since 2.8.0 + * + * @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 clean_url( $url, $protocols, 'db' ); +} + +/** + * Performs esc_url() for database or redirect usage. + * + * @see esc_url() + * @deprecated 2.8.0 + * + * @since 2.3.1 + * + * @param string $url The URL to be cleaned. + * @param array $protocols An array of acceptable protocols. + * @return string The cleaned URL. + */ +function sanitize_url( $url, $protocols = null ) { + return clean_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, both inline (for example in onclick="...") + * and inside <script> tag. 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 ); +} + +/** + * Escape single quotes, specialchar double quotes, and fix line endings. + * + * The filter 'js_escape' is also applied by esc_js() + * + * @since 2.0.4 + * + * @deprecated 2.8.0 + * @see esc_js() + * + * @param string $text The text to be escaped. + * @return string Escaped text. + */ +function js_escape( $text ) { + return esc_js( $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 blocks + * @deprecated 2.8.0 + * @see esc_html() + */ +function wp_specialchars( $string, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) { + if ( func_num_args() > 1 ) { // Maintain backwards compat for people passing additional args + $args = func_get_args(); + return call_user_func_array( '_wp_specialchars', $args ); + } else { + return esc_html( $string ); + } +} + +/** + * 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 HTML attributes. + * + * @since 2.0.6 + * + * @deprecated 2.8.0 + * @see esc_attr() + * + * @param string $text + * @return string + */ +function attribute_escape( $text ) { + return esc_attr( $text ); +} + +/** + * Escape a 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-Z_:]/', '', $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': + $value = sanitize_email($value); + 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 'embed_size_h': + case 'default_post_edit_rows': + case 'mailserver_port': + case 'comment_max_links': + case 'page_on_front': + 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': + $value = absint( $value ); + break; + + case 'embed_size_w': + if ( '' !== $value ) + $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': + $value = addslashes($value); + $value = wp_filter_post_kses( $value ); // calls stripslashes then addslashes + $value = stripslashes($value); + $value = esc_html( $value ); + break; + + case 'blog_charset': + $value = preg_replace('/[^a-zA-Z0-9_-]/', '', $value); // strips slashes + break; + + case 'date_format': + case 'time_format': + case 'mailserver_url': + case 'mailserver_login': + case 'mailserver_pass': + case 'ping_sites': + case 'upload_path': + $value = strip_tags($value); + $value = addslashes($value); + $value = wp_filter_kses($value); // calls stripslashes then addslashes + $value = stripslashes($value); + break; + + case 'gmt_offset': + $value = preg_replace('/[^0-9:.-]/', '', $value); // strips slashes + break; + + case 'siteurl': + case 'home': + $value = stripslashes($value); + $value = esc_url($value); + break; + default : + $value = apply_filters("sanitize_option_{$option}", $value, $option); + break; + } + + 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 coma */ + '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 integer $str String to get the excerpt from. + * @param integer $count Maximum number of characters to take. + * @return string The excerpt. + */ +function wp_html_excerpt( $str, $count ) { + $str = wp_strip_all_tags( $str, true ); + $str = mb_substr( $str, 0, $count ); + // remove part of an entity at the end + $str = preg_replace( '/&[^;\s]{0,6}$/', '', $str ); + return $str; +} + +/** + * 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') ) { + $attrs = implode('|', (array)$attrs); + return preg_replace_callback("!($attrs)=(['\"])(.+?)\\2!i", + create_function('$m', 'return _links_add_base($m, "' . $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. + * @param string $base The base URL to prefix to links. + * @return string The processed link. + */ +function _links_add_base($m, $base) { + //1 = attribute name 2 = quotation mark 3 = URL + return $m[1] . '=' . $m[2] . + (strpos($m[3], 'http://') === false ? + path_join($base, $m[3]) : + $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 striped 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') ) { + $tags = implode('|', (array)$tags); + return preg_replace_callback("!<($tags)(.+?)>!i", + create_function('$m', 'return _links_add_target($m, "' . $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. + * @param string $target The Target to add to the links. + * @return string The processed link. + */ +function _links_add_target( $m, $target ) { + $tag = $m[1]; + $link = preg_replace('|(target=[\'"](.*?)[\'"])|i', '', $m[2]); + return '<' . $tag . $link . ' target="' . $target . '">'; +} + +// normalize EOL characters and strip duplicate whitespace +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 whitre space, + * strip octets. + * + * @since 2.9 + * + * @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 ); + $filtered = wp_strip_all_tags( $filtered, true ); + } else { + $filtered = trim( preg_replace('/[\r\n\t ]+/', ' ', $filtered) ); + } + + $match = array(); + while ( preg_match('/%[a-f0-9]{2}/i', $filtered, $match) ) + $filtered = str_replace($match[0], '', $filtered); + + return apply_filters('sanitize_text

diff -r 53cff4b4a802 -r bde1974c263b web/wp-includes/formatting.php --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/web/wp-includes/formatting.php Wed Feb 03 15:37:20 2010 +0000 @@ -0,0 +1,2849 @@ + + * '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_setup = false, $opening_quote, $closing_quote, $default_no_texturize_tags, $default_no_texturize_shortcodes, $static_characters, $static_replacements, $dynamic_characters, $dynamic_replacements; + $output = ''; + $curl = ''; + $textarr = preg_split('/(<.*>|\[.*\])/Us', $text, -1, PREG_SPLIT_DELIM_CAPTURE); + $stop = count($textarr); + + // No need to setup these variables more than once + if (!$static_setup) { + /* translators: opening curly quote */ + $opening_quote = _x('“', 'opening curly quote'); + /* translators: closing curly quote */ + $closing_quote = _x('”', 'closing curly quote'); + + $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); + } else { + $cockney = array("'tain't","'twere","'twas","'tis","'twill","'til","'bout","'nuff","'round","'cause"); + $cockneyreplace = array("’tain’t","’twere","’twas","’tis","’twill","’til","’bout","’nuff","’round","’cause"); + } + + $static_characters = array_merge(array('---', ' -- ', '--', ' - ', 'xn–', '...', '``', '\'s', '\'\'', ' (tm)'), $cockney); + $static_replacements = array_merge(array('—', ' — ', '–', ' – ', 'xn--', '…', $opening_quote, '’s', $closing_quote, ' ™'), $cockneyreplace); + + $dynamic_characters = array('/\'(\d\d(?:’|\')?s)/', '/(\s|\A|[([{<]|")\'/', '/(\d+)"/', '/(\d+)\'/', '/(\S)\'([^\'\s])/', '/(\s|\A|[([{<])"(?!\s)/', '/"(\s|\S|\Z)/', '/\'([\s.]|\Z)/', '/(\d+)x(\d+)/'); + $dynamic_replacements = array('’$1','$1‘', '$1″', '$1′', '$1’$2', '$1' . $opening_quote . '$2', $closing_quote . '$1', '’$1', '$1×$2'); + + $static_setup = true; + } + + // Transform into regexp sub-expression used in _wptexturize_pushpop_element + // Must do this everytime 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(); + + for ( $i = 0; $i < $stop; $i++ ) { + $curl = $textarr[$i]; + + if ( !empty($curl) && '<' != $curl{0} && '[' != $curl{0} + && empty($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, $curl); + } elseif (!empty($curl)) { + /* + * Only call _wptexturize_pushpop_element if first char is correct + * tag opening + */ + if ('<' == $curl{0}) + _wptexturize_pushpop_element($curl, $no_texturize_tags_stack, $no_texturize_tags, '<', '>'); + elseif ('[' == $curl{0}) + _wptexturize_pushpop_element($curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes, '[', ']'); + } + + $curl = preg_replace('/&([^#])(?![a-zA-Z1-4]{1,8};)/', '&$1', $curl); + $output .= $curl; + } + + return $output; +} + +/** + * 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. + * + * @access private + * @since 2.9.0 + * + * @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 $opening Tag closing character + * @return object + */ +function _wptexturize_pushpop_element($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);
+		}
+	}
+}
+
+/**
+ * Accepts matches array from preg_replace_callback in wpautop() or a string.
+ *
+ * Ensures that the contents of a <>...<> HTML block are not
+ * converted into paragraphs or line-breaks.
+ *
+ * @since 1.2.0
+ *
+ * @param array|string $matches The array or string
+ * @return string The pre block without paragraph/line-break conversion.
+ */
+function clean_pre($matches) {
+	if ( is_array($matches) )
+		$text = $matches[1] . $matches[2] . "

"; + else + $text = $matches; + + $text = str_replace('
', '', $text); + $text = str_replace('

', "\n", $text); + $text = str_replace('

', '', $text); + + return $text; +} + +/** + * 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 int|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, $br = 1) { + + if ( trim($pee) === '' ) + return ''; + $pee = $pee . "\n"; // just to make things a little easier, pad the end + $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|form|map|area|blockquote|address|math|style|input|p|h[1-6]|hr|fieldset|legend)'; + $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('!

([^<]+)!', "

", $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) { + $pee = preg_replace_callback('/<(script|style).*?<\/\\1>/s', create_function('$matches', 'return str_replace("\n", "", $matches[0]);'), $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', $pee); + if (strpos($pee, ']*>)(.*?)!is', 'clean_pre', $pee ); + $pee = preg_replace( "|\n

$|", '

', $pee ); + + return $pee; +} + +/** + * 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) ) { + $tagnames = array_keys($shortcode_tags); + $tagregexp = join( '|', array_map('preg_quote', $tagnames) ); + $pee = preg_replace('/

\\s*?(\\[(' . $tagregexp . ')\\b.*?\\/?\\](?:.+?\\[\\/\\2\\])?)\\s*<\\/p>/s', '$1', $pee); + } + + return $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 + * + * @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 or not 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 = wp_specialchars_decode( $string, $_quote_style ); + $string = preg_replace( '/&(#?x?[0-9a-z]+);/i', '|wp_entity|$1|/wp_entity|', $string ); + } + + $string = @htmlspecialchars( $string, $quote_style, $charset ); + + // Handle double encoding ourselves + if ( !$double_encode ) { + $string = str_replace( array( '|wp_entity|', '|/wp_entity|' ), array( '&', ';' ), $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 + * + * @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 + * + * @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(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(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(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(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(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(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(182) => '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(191) => 'y', + // 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', + // Euro Sign + chr(226).chr(130).chr(172) => 'E', + // GBP (Pound) Sign + chr(194).chr(163) => ''); + + $string = strtr($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. Trim 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); +} + +/** + * Sanitize username stripping out unsafe characters. + * + * If $strict is true, only alphanumeric characters (as well as _, space, ., -, + * @) are returned. + * Removes tags, octets, entities, and if strict is enabled, will remove all + * non-ASCII characters. After sanitizing, it passes the username, raw username + * (the username in the parameter), and the strict parameter as parameters for + * the 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); + // 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); + + // Consolidate contiguous whitespace + $username = preg_replace('|\s+|', ' ', $username); + + return apply_filters('sanitize_user', $username, $raw_username, $strict); +} + +/** + * Sanitizes title or use 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 $title is empty. + * @return string The sanitized string. + */ +function sanitize_title($title, $fallback_title = '') { + $raw_title = $title; + $title = strip_tags($title); + $title = apply_filters('sanitize_title', $title, $raw_title); + + if ( '' === $title || false === $title ) + $title = $fallback_title; + + return $title; +} + +/** + * Sanitizes title, replacing whitespace with dashes. + * + * Limits the output to alphanumeric characters, underscore (_) and dash (-). + * Whitespace becomes a dash. + * + * @since 1.2.0 + * + * @param string $title The title to be sanitized. + * @return string The sanitized title. + */ +function sanitize_title_with_dashes($title) { + $title = strip_tags($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); + + $title = remove_accents($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); + $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|false 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; +} + +/** + * Santizes a 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 $fallback The value to return if the sanitization end's up as an empty string. + * @return string The sanitized value + */ +function sanitize_html_class($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, < > 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 = '') { + // 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' => '', + '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; +} + +/** + * Callback used to change %uXXXX to &#YYY; syntax + * + * @since 2.8? + * + * @param array $matches Single Match + * @return string An HTML entity + */ +function funky_javascript_callback($matches) { + return "&#".base_convert($matches[1],16,10).";"; +} + +/** + * Fixes javascript bugs in browsers. + * + * Converts unicode characters to HTML numbered entities. + * + * @since 1.5.0 + * @uses $is_macIE + * @uses $is_winIE + * + * @param string $text Text to be made safe. + * @return string Fixed text. + */ +function funky_javascript_fix($text) { + // Fixes for browsers' javascript bugs + global $is_macIE, $is_winIE; + + if ( $is_winIE || $is_macIE ) + $text = preg_replace_callback("/\%u([0-9A-F]{4,4})/", + "funky_javascript_callback", + $text); + + return $text; +} + +/** + * Will only balance the tags if forced to and the option is set to balance tags. + * + * The option 'use_balanceTags' is used for whether the tags will be balanced. + * Both the $force parameter and 'use_balanceTags' option will have to be true + * before the tags will be balanced. + * + * @since 0.71 + * + * @param string $text Text to be balanced + * @param bool $force 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') == 0 ) + return $text; + return force_balance_tags( $text ); +} + +/** + * Balances tags of string using a modified stack. + * + * @since 2.0.4 + * + * @author Leonard Lin <leonard@acm.org> + * @license GPL v2.0 + * @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 = ''; + $single_tags = array('br', 'hr', 'img', 'input'); //Known single-entity/self-closing tags + $nestable_tags = array('blockquote', 'div', 'span'); //Tags that can be immediately nested within themselves + + # 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 self-closing or '', don't do anything. + if((substr($regex[2],-1) == '/') || ($tag == '')) { + } + // ElseIf it's a known single-entity tag but it doesn't close itself, do so + elseif ( in_array($tag, $single_tags) ) { + $regex[2] .= '/'; + } else { // Push the tag onto the stack + // If the top of the stack is the same as the tag we want to push, close previous tag + if (($stacksize > 0) && !in_array($tag, $nestable_tags) && ($tagstack[$stacksize - 1] == $tag)) { + $tagqueue = '</' . array_pop ($tagstack) . '>'; + $stacksize--; + } + $stacksize = array_push ($tagstack, $tag); + } + + // Attributes + $attributes = $regex[2]; + if($attributes) { + $attributes = ' '.$attributes; + } + $tag = '<'.$tag.$attributes.'>'; + //If already queuing a close tag, then put this tag on, too + if ($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. + * + * Unless $richedit is set, it is simply a holder for the 'format_to_edit' + * filter. If $richedit is set true htmlspecialchars() will be run on the + * content, converting special characters to HTMl entities. + * + * @since 0.71 + * + * @param string $content The text about to be edited. + * @param bool $richedit Whether or not the $content should pass through htmlspecialchars(). Default false. + * @return string The text after the filter (and possibly htmlspecialchars()) has been run. + */ +function format_to_edit($content, $richedit = false) { + $content = apply_filters('format_to_edit', $content); + if (! $richedit ) + $content = htmlspecialchars($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 number 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) { + $string = preg_replace('/^([0-9])/', '\\\\\\\\\1', $string); + $string = preg_replace('/([a-z])/i', '\\\\\1', $string); + return $string; +} + +/** + * 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) { + global $wpdb; + + if (get_magic_quotes_gpc()) { + $gpc = stripslashes($gpc); + } + + return esc_sql($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 array|string $value The array or string to be striped. + * @return array|string Stripped array (or string in the callback). + */ +function stripslashes_deep($value) { + $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); + return $value; +} + +/** + * Navigates through an array and encodes the values to be used in a URL. + * + * Uses a callback to pass the value of the array back to the function as a + * string. + * + * @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; +} + +/** + * Converts email addresses characters to HTML entities to block spam bots. + * + * @since 0.71 + * + * @param string $emailaddy Email address. + * @param int $mailto Optional. Range from 0 to 1. Used for encoding. + * @return string Converted email address. + */ +function antispambot($emailaddy, $mailto=0) { + $emailNOSPAMaddy = ''; + srand ((float) microtime() * 1000000); + for ($i = 0; $i < strlen($emailaddy); $i = $i + 1) { + $j = floor(rand(0, 1+$mailto)); + if ($j==0) { + $emailNOSPAMaddy .= '&#'.ord(substr($emailaddy,$i,1)).';'; + } elseif ($j==1) { + $emailNOSPAMaddy .= substr($emailaddy,$i,1); + } elseif ($j==2) { + $emailNOSPAMaddy .= '%'.zeroise(dechex(ord(substr($emailaddy, $i, 1))), 2); + } + } + $emailNOSPAMaddy = str_replace('@','@',$emailNOSPAMaddy); + return $emailNOSPAMaddy; +} + +/** + * 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]; + + $url = esc_url($url); + if ( empty($url) ) + return $matches[0]; + + return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>"; +} + +/** + * 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 $ret Content to convert URIs. + * @return string Content with converted URIs. + */ +function make_clickable($ret) { + $ret = ' ' . $ret; + // in testing, using arrays here was found to be faster + $ret = preg_replace_callback('#(?<=[\s>])($)?([\w]+?://(?:[\w\\x80-\\xff\#$%&~/=?@\[\](+-]|[.,;:](?![\s<]|($)?([\s]|$))|(?(1)\)(?![\s<.,;:]|$)|\)))+)#is', '_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); + // this one is not in an array because we need it to run last, for cleanup of accidental links within links + $ret = preg_replace("#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i", "$1$3</a>", $ret); + $ret = trim($ret); + return $ret; +} + +/** + * 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 ) { + global $wpdb; + // 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); + $text = esc_sql($text); + return $text; +} + +/** + * Callback to used 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. + * + * 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 string $smiley Smiley code to convert to image. + * @return string Image string for smiley. + */ +function translate_smiley($smiley) { + global $wpsmiliestrans; + + if (count($smiley) == 0) { + return ''; + } + + $siteurl = get_option( 'siteurl' ); + + $smiley = trim(reset($smiley)); + $img = $wpsmiliestrans[$smiley]; + $smiley_masked = esc_attr($smiley); + + $srcurl = apply_filters('smilies_src', "$siteurl/wp-includes/images/smilies/$img", $img, $siteurl); + + return " <img src='$srcurl' 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 $check_dns Whether to check the DNS for the domain using checkdnsrr(). + * @return string|bool Either false or the valid email address. + */ +function is_email( $email, $check_dns = false ) { + // 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' ); + } + } + + // DNS + // Check the domain has a valid MX and A resource record + if ( $check_dns && function_exists( 'checkdnsrr' ) && !( checkdnsrr( $domain . '.', 'MX' ) || checkdnsrr( $domain . '.', 'A' ) ) ) { + return apply_filters( 'is_email', false, $email, 'dns_no_rr' ); + } + + // Congratulations your email made it! + return apply_filters( 'is_email', $email, $email, null ); +} + +/** + * Convert to ASCII from email subjects. + * + * @since 1.2.0 + * @usedby wp_mail() handles charsets in email subjects + * + * @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]); + $subject = preg_replace_callback('#\=([0-9a-f]{2})#i', create_function('$match', 'return chr(hexdec(strtolower($match[1])));'), $subject); + return $subject; + } +} + +/** + * Returns a date in the GMT equivalent. + * + * Requires and returns a date in the Y-m-d H:i:s format. 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 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') { + 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); + $string_time = gmmktime($matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1]); + $string_gmt = gmdate($format, $string_time - get_option('gmt_offset') * 3600); + return $string_gmt; +} + +/** + * Converts a GMT date into the correct format for the blog. + * + * Requires and returns in the Y-m-d H:i:s format. 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 $format The format string for the returned date (default is Y-m-d H:i:s) + * @return string Formatted date relative to the GMT offset. + */ +function get_date_from_gmt($string, $format = 'Y-m-d H:i:s') { + 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); + $string_time = gmmktime($matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1]); + $string_localtime = gmdate($format, $string_time + get_option('gmt_offset')*3600); + 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 = $sign * 3600 * ($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 = 3600 * 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 <= 3600) { + $mins = round($diff / 60); + if ($mins <= 1) { + $mins = 1; + } + $since = sprintf(_n('%s min', '%s mins', $mins), $mins); + } else if (($diff <= 86400) && ($diff > 3600)) { + $hours = round($diff / 3600); + if ($hours <= 1) { + $hours = 1; + } + $since = sprintf(_n('%s hour', '%s hours', $hours), $hours); + } elseif ($diff >= 86400) { + $days = round($diff / 86400); + if ($days <= 1) { + $days = 1; + } + $since = sprintf(_n('%s day', '%s days', $days), $days); + } + 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 $text The excerpt. If set to empty an excerpt is generated. + * @return string The excerpt. + */ +function wp_trim_excerpt($text) { + $raw_excerpt = $text; + if ( '' == $text ) { + $text = get_the_content(''); + + $text = strip_shortcodes( $text ); + + $text = apply_filters('the_content', $text); + $text = str_replace(']]>', ']]>', $text); + $text = strip_tags($text); + $excerpt_length = apply_filters('excerpt_length', 55); + $excerpt_more = apply_filters('excerpt_more', ' ' . '[...]'); + $words = explode(' ', $text, $excerpt_length + 1); + if (count($words) > $excerpt_length) { + array_pop($words); + $text = implode(' ', $words); + $text = $text . $excerpt_more; + } + } + return apply_filters('wp_trim_excerpt', $text, $raw_excerpt); +} + +/** + * 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) { + $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); + + 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); // convert only < > & + + return apply_filters('htmledit_pre', $output); +} + +/** + * Checks and cleans a URL. + * + * A number of characters are removed from the URL. If the URL is for displaying + * (the default behaviour) amperstands are also replaced. The 'esc_url' filter + * is applied to the returned cleaned URL. + * + * @since 1.2.0 + * @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' if not set. + * @param string $context Optional. How the URL will be used. Default is 'display'. + * @return string The cleaned $url after the 'cleaned_url' filter is applied. + */ +function clean_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(';//', '://', $url); + /* If the URL doesn't appear to contain a scheme, we + * presume it needs http:// appended (unless a relative + * link starting with / or a php file). + */ + if ( strpos($url, ':') === false && + substr( $url, 0, 1 ) != '/' && substr( $url, 0, 1 ) != '#' && !preg_match('/^[a-z0-9-]+?\.php/i', $url) ) + $url = 'http://' . $url; + + // Replace ampersands and single quotes only when displaying. + if ( 'display' == $context ) { + $url = preg_replace('/&([^#])(?![a-z]{2,8};)/', '&$1', $url); + $url = str_replace( "'", ''', $url ); + } + + if ( !is_array($protocols) ) + $protocols = array('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet'); + if ( wp_kses_bad_protocol( $url, $protocols ) != $url ) + return ''; + + return apply_filters('clean_url', $url, $original_url, $context); +} + +/** + * 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 + * @param string $subject + * @return string The processed string + */ +function _deep_replace($search, $subject){ + $found = true; + while($found) { + $found = false; + foreach( (array) $search as $val ) { + while(strpos($subject, $val) !== false) { + $found = true; + $subject = str_replace($val, '', $subject); + } + } + } + + return $subject; +} + +/** + * Escapes data for use in a MySQL query + * + * This is just a handy shortcut for $wpdb->escape(), for completeness' sake + * + * @since 2.8.0 + * @param string $sql Unescaped SQL data + * @return string The cleaned $sql + */ +function esc_sql( $sql ) { + global $wpdb; + return $wpdb->escape( $sql ); +} + + +/** + * Checks and cleans a URL. + * + * A number of characters are removed from the URL. If the URL is for displaying + * (the default behaviour) amperstands are also replaced. The 'esc_url' filter + * is applied to the returned cleaned URL. + * + * @since 2.8.0 + * @uses esc_url() + * @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' if not set. + * @return string The cleaned $url after the 'cleaned_url' filter is applied. + */ +function esc_url( $url, $protocols = null ) { + return clean_url( $url, $protocols, 'display' ); +} + +/** + * Performs esc_url() for database usage. + * + * @see esc_url() + * @see esc_url() + * + * @since 2.8.0 + * + * @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 clean_url( $url, $protocols, 'db' ); +} + +/** + * Performs esc_url() for database or redirect usage. + * + * @see esc_url() + * @deprecated 2.8.0 + * + * @since 2.3.1 + * + * @param string $url The URL to be cleaned. + * @param array $protocols An array of acceptable protocols. + * @return string The cleaned URL. + */ +function sanitize_url( $url, $protocols = null ) { + return clean_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, both inline (for example in onclick="...") + * and inside <script> tag. 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 ); +} + +/** + * Escape single quotes, specialchar double quotes, and fix line endings. + * + * The filter 'js_escape' is also applied by esc_js() + * + * @since 2.0.4 + * + * @deprecated 2.8.0 + * @see esc_js() + * + * @param string $text The text to be escaped. + * @return string Escaped text. + */ +function js_escape( $text ) { + return esc_js( $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 blocks + * @deprecated 2.8.0 + * @see esc_html() + */ +function wp_specialchars( $string, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) { + if ( func_num_args() > 1 ) { // Maintain backwards compat for people passing additional args + $args = func_get_args(); + return call_user_func_array( '_wp_specialchars', $args ); + } else { + return esc_html( $string ); + } +} + +/** + * 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 HTML attributes. + * + * @since 2.0.6 + * + * @deprecated 2.8.0 + * @see esc_attr() + * + * @param string $text + * @return string + */ +function attribute_escape( $text ) { + return esc_attr( $text ); +} + +/** + * Escape a 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-Z_:]/', '', $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': + $value = sanitize_email($value); + 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 'embed_size_h': + case 'default_post_edit_rows': + case 'mailserver_port': + case 'comment_max_links': + case 'page_on_front': + 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': + $value = absint( $value ); + break; + + case 'embed_size_w': + if ( '' !== $value ) + $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': + $value = addslashes($value); + $value = wp_filter_post_kses( $value ); // calls stripslashes then addslashes + $value = stripslashes($value); + $value = esc_html( $value ); + break; + + case 'blog_charset': + $value = preg_replace('/[^a-zA-Z0-9_-]/', '', $value); // strips slashes + break; + + case 'date_format': + case 'time_format': + case 'mailserver_url': + case 'mailserver_login': + case 'mailserver_pass': + case 'ping_sites': + case 'upload_path': + $value = strip_tags($value); + $value = addslashes($value); + $value = wp_filter_kses($value); // calls stripslashes then addslashes + $value = stripslashes($value); + break; + + case 'gmt_offset': + $value = preg_replace('/[^0-9:.-]/', '', $value); // strips slashes + break; + + case 'siteurl': + case 'home': + $value = stripslashes($value); + $value = esc_url($value); + break; + default : + $value = apply_filters("sanitize_option_{$option}", $value, $option); + break; + } + + 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 coma */ + '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 integer $str String to get the excerpt from. + * @param integer $count Maximum number of characters to take. + * @return string The excerpt. + */ +function wp_html_excerpt( $str, $count ) { + $str = wp_strip_all_tags( $str, true ); + $str = mb_substr( $str, 0, $count ); + // remove part of an entity at the end + $str = preg_replace( '/&[^;\s]{0,6}$/', '', $str ); + return $str; +} + +/** + * 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') ) { + $attrs = implode('|', (array)$attrs); + return preg_replace_callback("!($attrs)=(['\"])(.+?)\\2!i", + create_function('$m', 'return _links_add_base($m, "' . $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. + * @param string $base The base URL to prefix to links. + * @return string The processed link. + */ +function _links_add_base($m, $base) { + //1 = attribute name 2 = quotation mark 3 = URL + return $m[1] . '=' . $m[2] . + (strpos($m[3], 'http://') === false ? + path_join($base, $m[3]) : + $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 striped 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') ) { + $tags = implode('|', (array)$tags); + return preg_replace_callback("!<($tags)(.+?)>!i", + create_function('$m', 'return _links_add_target($m, "' . $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. + * @param string $target The Target to add to the links. + * @return string The processed link. + */ +function _links_add_target( $m, $target ) { + $tag = $m[1]; + $link = preg_replace('|(target=[\'"](.*?)[\'"])|i', '', $m[2]); + return '<' . $tag . $link . ' target="' . $target . '">'; +} + +// normalize EOL characters and strip duplicate whitespace +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 whitre space, + * strip octets. + * + * @since 2.9 + * + * @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 ); + $filtered = wp_strip_all_tags( $filtered, true ); + } else { + $filtered = trim( preg_replace('/[\r\n\t ]+/', ' ', $filtered) ); + } + + $match = array(); + while ( preg_match('/%[a-f0-9]{2}/i', $filtered, $match) ) + $filtered = str_replace($match[0], '', $filtered); + + return apply_filters('sanitize_text_field', $filtered, $str); +} + +?>