<?php

/**

 * Misc WordPress Administration API.

 *

 * @package WordPress

 * @subpackage Administration

 */

/**

 * Returns whether the server is running Apache with the mod_rewrite module loaded.

 *

 * @since 2.0.0

 *

 * @return bool

 */

function got_mod_rewrite() {

	$got_rewrite = apache_mod_loaded('mod_rewrite', true);

	/**

	 * Filter whether Apache and mod_rewrite are present.

	 *

	 * This filter was previously used to force URL rewriting for other servers,

	 * like nginx. Use the got_url_rewrite filter in got_url_rewrite() instead.

	 *

	 * @see got_url_rewrite()

	 *

	 * @since 2.5.0

	 * @param bool $got_rewrite Whether Apache and mod_rewrite are present.

	 */

	return apply_filters('got_rewrite', $got_rewrite);

}

/**

 * Returns whether the server supports URL rewriting.

 *

 * Detects Apache's mod_rewrite, IIS 7.0+ permalink support, and nginx.

 *

 * @since 3.7.0

 *

 * @return bool Whether the server supports URL rewriting.

 */

function got_url_rewrite() {

	$got_url_rewrite = ( got_mod_rewrite() || $GLOBALS['is_nginx'] || iis7_supports_permalinks() );

	/**

	 * Filter whether URL rewriting is available.

	 *

	 * @since 3.7.0

	 * @param bool $got_url_rewrite Whether URL rewriting is available.

	 */

	return apply_filters( 'got_url_rewrite', $got_url_rewrite );

}

/**

 * {@internal Missing Short Description}}

 *

 * @since 1.5.0

 *

 * @param unknown_type $filename

 * @param unknown_type $marker

 * @return array An array of strings from a file (.htaccess ) from between BEGIN and END markers.

 */

function extract_from_markers( $filename, $marker ) {

	$result = array ();

	if (!file_exists( $filename ) ) {

		return $result;

	}

	if ( $markerdata = explode( "\n", implode( '', file( $filename ) ) ));

	{

		$state = false;

		foreach ( $markerdata as $markerline ) {

			if (strpos($markerline, '# END ' . $marker) !== false)

				$state = false;

			if ( $state )

				$result[] = $markerline;

			if (strpos($markerline, '# BEGIN ' . $marker) !== false)

				$state = true;

		}

	}

	return $result;

}

/**

 * {@internal Missing Short Description}}

 *

 * Inserts an array of strings into a file (.htaccess ), placing it between

 * BEGIN and END markers. Replaces existing marked info. Retains surrounding

 * data. Creates file if none exists.

 *

 * @since 1.5.0

 *

 * @param unknown_type $filename

 * @param unknown_type $marker

 * @param unknown_type $insertion

 * @return bool True on write success, false on failure.

 */

function insert_with_markers( $filename, $marker, $insertion ) {

	if (!file_exists( $filename ) || is_writeable( $filename ) ) {

		if (!file_exists( $filename ) ) {

			$markerdata = '';

		} else {

			$markerdata = explode( "\n", implode( '', file( $filename ) ) );

		}

		if ( !$f = @fopen( $filename, 'w' ) )

			return false;

		$foundit = false;

		if ( $markerdata ) {

			$state = true;

			foreach ( $markerdata as $n => $markerline ) {

				if (strpos($markerline, '# BEGIN ' . $marker) !== false)

					$state = false;

				if ( $state ) {

					if ( $n + 1 < count( $markerdata ) )

						fwrite( $f, "{$markerline}\n" );

					else

						fwrite( $f, "{$markerline}" );

				}

				if (strpos($markerline, '# END ' . $marker) !== false) {

					fwrite( $f, "# BEGIN {$marker}\n" );

					if ( is_array( $insertion ))

						foreach ( $insertion as $insertline )

							fwrite( $f, "{$insertline}\n" );

					fwrite( $f, "# END {$marker}\n" );

					$state = true;

					$foundit = true;

				}

			}

		}

		if (!$foundit) {

			fwrite( $f, "\n# BEGIN {$marker}\n" );

			foreach ( $insertion as $insertline )

				fwrite( $f, "{$insertline}\n" );

			fwrite( $f, "# END {$marker}\n" );

		}

		fclose( $f );

		return true;

	} else {

		return false;

	}

}

/**

 * Updates the htaccess file with the current rules if it is writable.

 *

 * Always writes to the file if it exists and is writable to ensure that we

 * blank out old rules.

 *

 * @since 1.5.0

 */

function save_mod_rewrite_rules() {

	if ( is_multisite() )

		return;

	global $wp_rewrite;

	$home_path = get_home_path();

	$htaccess_file = $home_path.'.htaccess';

	// If the file doesn't already exist check for write access to the directory and whether we have some rules.

	// else check for write access to the file.

	if ((!file_exists($htaccess_file) && is_writable($home_path) && $wp_rewrite->using_mod_rewrite_permalinks()) || is_writable($htaccess_file)) {

		if ( got_mod_rewrite() ) {

			$rules = explode( "\n", $wp_rewrite->mod_rewrite_rules() );

			return insert_with_markers( $htaccess_file, 'WordPress', $rules );

		}

	}

	return false;

}

/**

 * Updates the IIS web.config file with the current rules if it is writable.

 * If the permalinks do not require rewrite rules then the rules are deleted from the web.config file.

 *

 * @since 2.8.0

 *

 * @return bool True if web.config was updated successfully

 */

function iis7_save_url_rewrite_rules(){

	if ( is_multisite() )

		return;

	global $wp_rewrite;

	$home_path = get_home_path();

	$web_config_file = $home_path . 'web.config';

	// Using win_is_writable() instead of is_writable() because of a bug in Windows PHP

	if ( iis7_supports_permalinks() && ( ( ! file_exists($web_config_file) && win_is_writable($home_path) && $wp_rewrite->using_mod_rewrite_permalinks() ) || win_is_writable($web_config_file) ) ) {

		$rule = $wp_rewrite->iis7_url_rewrite_rules(false, '', '');

		if ( ! empty($rule) ) {

			return iis7_add_rewrite_rule($web_config_file, $rule);

		} else {

			return iis7_delete_rewrite_rule($web_config_file);

		}

	}

	return false;

}

/**

 * {@internal Missing Short Description}}

 *

 * @since 1.5.0

 *

 * @param unknown_type $file

 */

function update_recently_edited( $file ) {

	$oldfiles = (array ) get_option( 'recently_edited' );

	if ( $oldfiles ) {

		$oldfiles = array_reverse( $oldfiles );

		$oldfiles[] = $file;

		$oldfiles = array_reverse( $oldfiles );

		$oldfiles = array_unique( $oldfiles );

		if ( 5 < count( $oldfiles ))

			array_pop( $oldfiles );

	} else {

		$oldfiles[] = $file;

	}

	update_option( 'recently_edited', $oldfiles );

}

/**

 * If siteurl, home or page_on_front changed, flush rewrite rules.

 *

 * @since 2.1.0

 *

 * @param string $old_value

 * @param string $value

 */

function update_home_siteurl( $old_value, $value ) {

	if ( defined( "WP_INSTALLING" ) )

		return;

	// If home changed, write rewrite rules to new location.

	flush_rewrite_rules();

}

add_action( 'update_option_home', 'update_home_siteurl', 10, 2 );

add_action( 'update_option_siteurl', 'update_home_siteurl', 10, 2 );

add_action( 'update_option_page_on_front', 'update_home_siteurl', 10, 2 );

/**

 * Shorten an URL, to be used as link text

 *

 * @since 1.2.1

 *

 * @param string $url

 * @return string

 */

function url_shorten( $url ) {

	$short_url = str_replace( array( 'http://', 'www.' ), '', $url );

	$short_url = untrailingslashit( $short_url );

	if ( strlen( $short_url ) > 35 )

		$short_url = substr( $short_url, 0, 32 ) . '…';

	return $short_url;

}

/**

 * Resets global variables based on $_GET and $_POST

 *

 * This function resets global variables based on the names passed

 * in the $vars array to the value of $_POST[$var] or $_GET[$var] or ''

 * if neither is defined.

 *

 * @since 2.0.0

 *

 * @param array $vars An array of globals to reset.

 */

function wp_reset_vars( $vars ) {

	for ( $i=0; $i<count( $vars ); $i += 1 ) {

		$var = $vars[$i];

		global $$var;

		if ( empty( $_POST[$var] ) ) {

			if ( empty( $_GET[$var] ) )

				$$var = '';

			else

				$$var = $_GET[$var];

		} else {

			$$var = $_POST[$var];

		}

	}

}

/**

 * {@internal Missing Short Description}}

 *

 * @since 2.1.0

 *

 * @param unknown_type $message

 */

function show_message($message) {

	if ( is_wp_error($message) ){

		if ( $message->get_error_data() && is_string( $message->get_error_data() ) )

			$message = $message->get_error_message() . ': ' . $message->get_error_data();

		else

			$message = $message->get_error_message();

	}

	echo "<p>$message</p>\n";

	wp_ob_end_flush_all();

	flush();

}

function wp_doc_link_parse( $content ) {

	if ( !is_string( $content ) || empty( $content ) )

		return array();

	if ( !function_exists('token_get_all') )

		return array();

	$tokens = token_get_all( $content );

	$functions = array();

	$ignore_functions = array();

	for ( $t = 0, $count = count( $tokens ); $t < $count; $t++ ) {

		if ( !is_array( $tokens[$t] ) ) continue;

		if ( T_STRING == $tokens[$t][0] && ( '(' == $tokens[ $t + 1 ] || '(' == $tokens[ $t + 2 ] ) ) {

			// If it's a function or class defined locally, there's not going to be any docs available

			if ( ( isset( $tokens[ $t - 2 ][1] ) && in_array( $tokens[ $t - 2 ][1], array( 'function', 'class' ) ) ) || ( isset( $tokens[ $t - 2 ][0] ) && T_OBJECT_OPERATOR == $tokens[ $t - 1 ][0] ) ) {

				$ignore_functions[] = $tokens[$t][1];

			}

			// Add this to our stack of unique references

			$functions[] = $tokens[$t][1];

		}

	}

	$functions = array_unique( $functions );

	sort( $functions );

	$ignore_functions = apply_filters( 'documentation_ignore_functions', $ignore_functions );

	$ignore_functions = array_unique( $ignore_functions );

	$out = array();

	foreach ( $functions as $function ) {

		if ( in_array( $function, $ignore_functions ) )

			continue;

		$out[] = $function;

	}

	return $out;

}

/**

 * Saves option for number of rows when listing posts, pages, comments, etc.

 *

 * @since 2.8

**/

function set_screen_options() {

	if ( isset($_POST['wp_screen_options']) && is_array($_POST['wp_screen_options']) ) {

		check_admin_referer( 'screen-options-nonce', 'screenoptionnonce' );

		if ( !$user = wp_get_current_user() )

			return;

		$option = $_POST['wp_screen_options']['option'];

		$value = $_POST['wp_screen_options']['value'];

		if ( $option != sanitize_key( $option ) )

			return;

		$map_option = $option;

		$type = str_replace('edit_', '', $map_option);

		$type = str_replace('_per_page', '', $type);

		if ( in_array( $type, get_taxonomies() ) )

			$map_option = 'edit_tags_per_page';

		elseif ( in_array( $type, get_post_types() ) )

			$map_option = 'edit_per_page';

		else

			$option = str_replace('-', '_', $option);

		switch ( $map_option ) {

			case 'edit_per_page':

			case 'users_per_page':

			case 'edit_comments_per_page':

			case 'upload_per_page':

			case 'edit_tags_per_page':

			case 'plugins_per_page':

			// Network admin

			case 'sites_network_per_page':

			case 'users_network_per_page':

			case 'site_users_network_per_page':

			case 'plugins_network_per_page':

			case 'themes_network_per_page':

			case 'site_themes_network_per_page':

				$value = (int) $value;

				if ( $value < 1 || $value > 999 )

					return;

				break;

			default:

				$value = apply_filters('set-screen-option', false, $option, $value);

				if ( false === $value )

					return;

				break;

		}

		update_user_meta($user->ID, $option, $value);

		wp_safe_redirect( remove_query_arg( array('pagenum', 'apage', 'paged'), wp_get_referer() ) );

		exit;

	}

}

/**

 * Check if rewrite rule for WordPress already exists in the IIS 7+ configuration file

 *

 * @since 2.8.0

 *

 * @return bool

 * @param string $filename The file path to the configuration file

 */

function iis7_rewrite_rule_exists($filename) {

	if ( ! file_exists($filename) )

		return false;

	if ( ! class_exists('DOMDocument') )

		return false;

	$doc = new DOMDocument();

	if ( $doc->load($filename) === false )

		return false;

	$xpath = new DOMXPath($doc);