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<?php
/**
* WordPress Plugin Administration API
*
* @package WordPress
* @subpackage Administration
*/

/**
* Parse the plugin contents to retrieve plugin's metadata.
*
* The metadata of the plugin's data searches for the following in the plugin's
* header. All plugin data must be on its own line. For plugin description, it
* must not have any newlines or only parts of the description will be displayed
* and the same goes for the plugin data. The below is formatted for printing.
*
* <code>
* /*
* Plugin Name: Name of Plugin
* Plugin URI: Link to plugin information
* Description: Plugin Description
* Author: Plugin author's name
* Author URI: Link to the author's web site
* Version: Must be set in the plugin for WordPress 2.3+
* Text Domain: Optional. Unique identifier, should be same as the one used in
* plugin_text_domain()
* Domain Path: Optional. Only useful if the translations are located in a
* folder above the plugin's base path. For example, if .mo files are
* located in the locale folder then Domain Path will be "/locale/" and
* must have the first slash. Defaults to the base folder the plugin is
* located in.
* Network: Optional. Specify "Network: true" to require that a plugin is activated
* across all sites in an installation. This will prevent a plugin from being
* activated on a single site when Multisite is enabled.
* * / # Remove the space to close comment
* </code>
*
* Plugin data returned array contains the following:
* 'Name' - Name of the plugin, must be unique.
* 'Title' - Title of the plugin and the link to the plugin's web site.
* 'Description' - Description of what the plugin does and/or notes
* from the author.
* 'Author' - The author's name
* 'AuthorURI' - The authors web site address.
* 'Version' - The plugin version number.
* 'PluginURI' - Plugin web site address.
* 'TextDomain' - Plugin's text domain for localization.
* 'DomainPath' - Plugin's relative directory path to .mo files.
* 'Network' - Boolean. Whether the plugin can only be activated network wide.
*
* Some users have issues with opening large files and manipulating the contents
* for want is usually the first 1kiB or 2kiB. This function stops pulling in
* the plugin contents when it has all of the required plugin data.
*
* The first 8kiB of the file will be pulled in and if the plugin data is not
* within that first 8kiB, then the plugin author should correct their plugin
* and move the plugin data headers to the top.
*
* The plugin file is assumed to have permissions to allow for scripts to read
* the file. This is not checked however and the file is only opened for
* reading.
*
* @link http://trac.wordpress.org/ticket/5651 Previous Optimizations.
* @link http://trac.wordpress.org/ticket/7372 Further and better Optimizations.
* @since 1.5.0
*
* @param string $plugin_file Path to the plugin file
* @param bool $markup Optional. If the returned data should have HTML markup applied. Defaults to true.
* @param bool $translate Optional. If the returned data should be translated. Defaults to true.
* @return array See above for description.
*/
function get_plugin_data( $plugin_file, $markup = true, $translate = true ) {

$default_headers = array(
'Name' => 'Plugin Name',
'PluginURI' => 'Plugin URI',
'Version' => 'Version',
'Description' => 'Description',
'Author' => 'Author',
'AuthorURI' => 'Author URI',
'TextDomain' => 'Text Domain',
'DomainPath' => 'Domain Path',
'Network' => 'Network',
// Site Wide Only is deprecated in favor of Network.
'_sitewide' => 'Site Wide Only',
);

$plugin_data = get_file_data( $plugin_file, $default_headers, 'plugin' );

// Site Wide Only is the old header for Network
if ( ! $plugin_data['Network'] && $plugin_data['_sitewide'] ) {
_deprecated_argument( __FUNCTION__, '3.0', sprintf( __( 'The <code>%1$s</code> plugin header is deprecated. Use <code>%2$s</code> instead.' ), 'Site Wide Only: true', 'Network: true' ) );
$plugin_data['Network'] = $plugin_data['_sitewide'];
}
$plugin_data['Network'] = ( 'true' == strtolower( $plugin_data['Network'] ) );
unset( $plugin_data['_sitewide'] );

if ( $markup || $translate ) {
$plugin_data = _get_plugin_data_markup_translate( $plugin_file, $plugin_data, $markup, $translate );
} else {
$plugin_data['Title'] = $plugin_data['Name'];
$plugin_data['AuthorName'] = $plugin_data['Author'];
}

return $plugin_data;
}

/**
* Sanitizes plugin data, optionally adds markup, optionally translates.
*
* @since 2.7.0
* @access private
* @see get_plugin_data()
*/
function _get_plugin_data_markup_translate( $plugin_file, $plugin_data, $markup = true, $translate = true ) {

// Translate fields
if ( $translate ) {
if ( $textdomain = $plugin_data['TextDomain'] ) {
if ( $plugin_data['DomainPath'] )
load_plugin_textdomain( $textdomain, false, dirname( $plugin_file ) . $plugin_data['DomainPath'] );
else
load_plugin_textdomain( $textdomain, false, dirname( $plugin_file ) );
} elseif ( in_array( basename( $plugin_file ), array( 'hello.php', 'akismet.php' ) ) ) {
$textdomain = 'default';
}
if ( $textdomain ) {
foreach ( array( 'Name', 'PluginURI', 'Description', 'Author', 'AuthorURI', 'Version' ) as $field )
$plugin_data[ $field ] = translate( $plugin_data[ $field ], $textdomain );
}
}

// Sanitize fields
$allowed_tags = $allowed_tags_in_links = array(
'abbr' => array( 'title' => true ),
'acronym' => array( 'title' => true ),
'code' => true,
'em' => true,
'strong' => true,
);
$allowed_tags['a'] = array( 'href' => true, 'title' => true );

// Name is marked up inside <a> tags. Don't allow these.
// Author is too, but some plugins have used <a> here (omitting Author URI).
$plugin_data['Name'] = wp_kses( $plugin_data['Name'], $allowed_tags_in_links );
$plugin_data['Author'] = wp_kses( $plugin_data['Author'], $allowed_tags );

$plugin_data['Description'] = wp_kses( $plugin_data['Description'], $allowed_tags );
$plugin_data['Version'] = wp_kses( $plugin_data['Version'], $allowed_tags );

$plugin_data['PluginURI'] = esc_url( $plugin_data['PluginURI'] );
$plugin_data['AuthorURI'] = esc_url( $plugin_data['AuthorURI'] );

$plugin_data['Title'] = $plugin_data['Name'];
$plugin_data['AuthorName'] = $plugin_data['Author'];

// Apply markup
if ( $markup ) {
if ( $plugin_data['PluginURI'] && $plugin_data['Name'] )
$plugin_data['Title'] = '<a href="' . $plugin_data['PluginURI'] . '" title="' . esc_attr__( 'Visit plugin homepage' ) . '" target="_blank">' . $plugin_data['Name'] . '</a>';

if ( $plugin_data['AuthorURI'] && $plugin_data['Author'] )
$plugin_data['Author'] = '<a href="' . $plugin_data['AuthorURI'] . '" title="' . esc_attr__( 'Visit author homepage' ) . '" target="_blank">' . $plugin_data['Author'] . '</a>';

$plugin_data['Description'] = wptexturize( $plugin_data['Description'] );

if ( $plugin_data['Author'] )
$plugin_data['Description'] .= ' <cite>' . sprintf( __('By %s.'), $plugin_data['Author'] ) . '</cite>';
}

return $plugin_data;
}

/**
* Get a list of a plugin's files.
*
* @since 2.8.0
*
* @param string $plugin Plugin ID
* @return array List of files relative to the plugin root.
*/
function get_plugin_files($plugin) {
$plugin_file = WP_PLUGIN_DIR . '/' . $plugin;
$dir = dirname($plugin_file);
$plugin_files = array($plugin);
if ( is_dir($dir) && $dir != WP_PLUGIN_DIR ) {
$plugins_dir = @ opendir( $dir );
if ( $plugins_dir ) {
while (($file = readdir( $plugins_dir ) ) !== false ) {
if ( substr($file, 0, 1) == '.' )
continue;
if ( is_dir( $dir . '/' . $file ) ) {
$plugins_subdir = @ opendir( $dir . '/' . $file );
if ( $plugins_subdir ) {
while (($subfile = readdir( $plugins_subdir ) ) !== false ) {
if ( substr($subfile, 0, 1) == '.' )
continue;
$plugin_files[] = plugin_basename("$dir/$file/$subfile");
}
@closedir( $plugins_subdir );
}
} else {
if ( plugin_basename("$dir/$file") != $plugin )
$plugin_files[] = plugin_basename("$dir/$file");
}
}
@closedir( $plugins_dir );
}
}

return $plugin_files;
}

/**
* Check the plugins directory and retrieve all plugin files with plugin data.
*
* WordPress only supports plugin files in the base plugins directory
* (wp-content/plugins) and in one directory above the plugins directory
* (wp-content/plugins/my-plugin). The file it looks for has the plugin data and
* must be found in those two locations. It is recommended that do keep your
* plugin files in directories.
*
* The file with the plugin data is the file that will be included and therefore
* needs to have the main execution for the plugin. This does not mean
* everything must be contained in the file and it is recommended that the file
* be split for maintainability. Keep everything in one file for extreme
* optimization purposes.
*
* @since 1.5.0
*
* @param string $plugin_folder Optional. Relative path to single plugin folder.
* @return array Key is the plugin file path and the value is an array of the plugin data.
*/
function get_plugins($plugin_folder = '') {

if ( ! $cache_plugins = wp_cache_get('plugins', 'plugins') )
$cache_plugins = array();

if ( isset($cache_plugins[ $plugin_folder ]) )
return $cache_plugins[ $plugin_folder ];

$wp_plugins = array ();
$plugin_root = WP_PLUGIN_DIR;
if ( !empty($plugin_folder) )
$plugin_root .= $plugin_folder;

// Files in wp-content/plugins directory
$plugins_dir = @ opendir( $plugin_root);
$plugin_files = array();
if ( $plugins_dir ) {
while (($file = readdir( $plugins_dir ) ) !== false ) {
if ( substr($file, 0, 1) == '.' )
continue;
if ( is_dir( $plugin_root.'/'.$file ) ) {
$plugins_subdir = @ opendir( $plugin_root.'/'.$file );
if ( $plugins_subdir ) {
while (($subfile = readdir( $plugins_subdir ) ) !== false ) {
if ( substr($subfile, 0, 1) == '.' )
continue;
if ( substr($subfile, -4) == '.php' )
$plugin_files[] = "$file/$subfile";
}
closedir( $plugins_subdir );
}
} else {
if ( substr($file, -4) == '.php' )
$plugin_files[] = $file;
}
}
closedir( $plugins_dir );
}

if ( empty($plugin_files) )
return $wp_plugins;

foreach ( $plugin_files as $plugin_file ) {
if ( !is_readable( "$plugin_root/$plugin_file" ) )
continue;

$plugin_data = get_plugin_data( "$plugin_root/$plugin_file", false, false ); //Do not apply markup/translate as it'll be cached.

if ( empty ( $plugin_data['Name'] ) )
continue;

$wp_plugins[plugin_basename( $plugin_file )] = $plugin_data;
}

uasort( $wp_plugins, '_sort_uname_callback' );

$cache_plugins[ $plugin_folder ] = $wp_plugins;
wp_cache_set('plugins', $cache_plugins, 'plugins');

return $wp_plugins;
}

/**
* Check the mu-plugins directory and retrieve all mu-plugin files with any plugin data.
*
* WordPress only includes mu-plugin files in the base mu-plugins directory (wp-content/mu-plugins).
*
* @since 3.0.0
* @return array Key is the mu-plugin file path and the value is an array of the mu-plugin data.
*/
function get_mu_plugins() {
$wp_plugins = array();
// Files in wp-content/mu-plugins directory
$plugin_files = array();

if ( ! is_dir( WPMU_PLUGIN_DIR ) )
return $wp_plugins;
if ( $plugins_dir = @ opendir( WPMU_PLUGIN_DIR ) ) {
while ( ( $file = readdir( $plugins_dir ) ) !== false ) {
if ( substr( $file, -4 ) == '.php' )
$plugin_files[] = $file;
}
} else {
return $wp_plugins;
}

@closedir( $plugins_dir );

if ( empty($plugin_files) )
return $wp_plugins;

foreach ( $plugin_files as $plugin_file ) {
if ( !is_readable( WPMU_PLUGIN_DIR . "/$plugin_file" ) )
continue;

$plugin_data = get_plugin_data( WPMU_PLUGIN_DIR . "/$plugin_file", false, false ); //Do not apply markup/translate as it'll be cached.

if ( empty ( $plugin_data['Name'] ) )
$plugin_data['Name'] = $plugin_file;

$wp_plugins[ $plugin_file ] = $plugin_data;
}

if ( isset( $wp_plugins['index.php'] ) && filesize( WPMU_PLUGIN_DIR . '/index.php') <= 30 ) // silence is golden
unset( $wp_plugins['index.php'] );

uasort( $wp_plugins, '_sort_uname_callback' );

return $wp_plugins;
}

/**
* Callback to sort array by a 'Name' key.
*
* @since 3.1.0
* @access private
*/
function _sort_uname_callback( $a, $b ) {
return strnatcasecmp( $a['Name'], $b['Name'] );
}

/**
* Check the wp-content directory and retrieve all drop-ins with any plugin data.
*
* @since 3.0.0
* @return array Key is the file path and the value is an array of the plugin data.
*/
function get_dropins() {
$dropins = array();
$plugin_files = array();

$_dropins = _get_dropins();

// These exist in the wp-content directory
if ( $plugins_dir = @ opendir( WP_CONTENT_DIR ) ) {
while ( ( $file = readdir( $plugins_dir ) ) !== false ) {
if ( isset( $_dropins[ $file ] ) )
$plugin_files[] = $file;
}
} else {
return $dropins;
}

@closedir( $plugins_dir );

if ( empty($plugin_files) )
return $dropins;

foreach ( $plugin_files as $plugin_file ) {
if ( !is_readable( WP_CONTENT_DIR . "/$plugin_file" ) )
continue;
$plugin_data = get_plugin_data( WP_CONTENT_DIR . "/$plugin_file", false, false ); //Do not apply markup/translate as it'll be cached.
if ( empty( $plugin_data['Name'] ) )
$plugin_data['Name'] = $plugin_file;
$dropins[ $plugin_file ] = $plugin_data;
}

uksort( $dropins, 'strnatcasecmp' );

return $dropins;
}

/**
* Returns drop-ins that WordPress uses.
*
* Includes Multisite drop-ins only when is_multisite()
*
* @since 3.0.0
* @return array Key is file name. The value is an array, with the first value the
* purpose of the drop-in and the second value the name of the constant that must be
* true for the drop-in to be used, or true if no constant is required.
*/
function _get_dropins() {
$dropins = array(
'advanced-cache.php' => array( __( 'Advanced caching plugin.' ), 'WP_CACHE' ), // WP_CACHE
'db.php' => array( __( 'Custom database class.' ), true ), // auto on load
'db-error.php' => array( __( 'Custom database error message.' ), true ), // auto on error
'install.php' => array( __( 'Custom install script.' ), true ), // auto on install
'maintenance.php' => array( __( 'Custom maintenance message.' ), true ), // auto on maintenance
'object-cache.php' => array( __( 'External object cache.' ), true ), // auto on load
);

if ( is_multisite() ) {
$dropins['sunrise.php' ] = array( __( 'Executed before Multisite is loaded.' ), 'SUNRISE' ); // SUNRISE
$dropins['blog-deleted.php' ] = array( __( 'Custom site deleted message.' ), true ); // auto on deleted blog
$dropins['blog-inactive.php' ] = array( __( 'Custom site inactive message.' ), true ); // auto on inactive blog
$dropins['blog-suspended.php'] = array( __( 'Custom site suspended message.' ), true ); // auto on archived or spammed blog
}

return $dropins;
}

/**
* Check whether the plugin is active by checking the active_plugins list.
*
* @since 2.5.0
*
* @param string $plugin Base plugin path from plugins directory.
* @return bool True, if in the active plugins list. False, not in the list.
*/
function is_plugin_active( $plugin ) {
return in_array( $plugin, (array) get_option( 'active_plugins', array() ) ) || is_plugin_active_for_network( $plugin );
}

/**
* Check whether the plugin is inactive.
*
* Reverse of is_plugin_active(). Used as a callback.
*
* @since 3.1.0
* @see is_plugin_active()
*
* @param string $plugin Base plugin path from plugins directory.
* @return bool True if inactive. False if active.
*/
function is_plugin_inactive( $plugin ) {
return ! is_plugin_active( $plugin );
}

/**
* Check whether the plugin is active for the entire network.
*
* @since 3.0.0
*
* @param string $plugin Base plugin path from plugins directory.
* @return bool True, if active for the network, otherwise false.
*/
function is_plugin_active_for_network( $plugin ) {
if ( !is_multisite() )
return false;

$plugins = get_site_option( 'active_sitewide_plugins');
if ( isset($plugins[$plugin]) )
return true;

return false;
}

/**
* Checks for "Network: true" in the plugin header to see if this should
* be activated only as a network wide plugin. The plugin would also work
* when Multisite is not enabled.
*
* Checks for "Site Wide Only: true" for backwards compatibility.
*
* @since 3.0.0
*
* @param string $plugin Plugin to check
* @return bool True if plugin is network only, false otherwise.
*/
function is_network_only_plugin( $plugin ) {
$plugin_data = get_plugin_data( WP_PLUGIN_DIR . '/' . $plugin );
if ( $plugin_data )
return $plugin_data['Network'];
return false;
}

/**
* Attempts activation of plugin in a "sandbox" and redirects on success.
*
* A plugin that is already activated will not attempt to be activated again.
*
* The way it works is by setting the redirection to the error before trying to
* include the plugin file. If the plugin fails, then the redirection will not
* be overwritten with the success message. Also, the options will not be
* updated and the activation hook will not be called on plugin error.
*
* It should be noted that in no way the below code will actually prevent errors
* within the file. The code should not be used elsewhere to replicate the
* "sandbox", which uses redirection to work.
* {@source 13 1}
*
* If any errors are found or text is outputted, then it will be captured to
* ensure that the success redirection will update the error redirection.
*
* @since 2.5.0
*
* @param string $plugin Plugin path to main plugin file with plugin data.
* @param string $redirect Optional. URL to redirect to.
* @param bool $network_wide Whether to enable the plugin for all sites in the
* network or just the current site. Multisite only. Default is false.
* @param bool $silent Prevent calling activation hooks. Optional, default is false.
* @return WP_Error|null WP_Error on invalid file or null on success.
*/
function activate_plugin( $plugin, $redirect = '', $network_wide = false, $silent = false ) {
$plugin = plugin_basename( trim( $plugin ) );

if ( is_multisite() && ( $network_wide || is_network_only_plugin($plugin) ) ) {
$network_wide = true;
$current = get_site_option( 'active_sitewide_plugins', array() );
$_GET['networkwide'] = 1; // Back compat for plugins looking for this value.
} else {
$current = get_option( 'active_plugins', array() );
}

$valid = validate_plugin($plugin);
if ( is_wp_error($valid) )
return $valid;

if ( !in_array($plugin, $current) ) {
if ( !empty($redirect) )
wp_redirect(add_query_arg('_error_nonce', wp_create_nonce('plugin-activation-error_' . $plugin), $redirect)); // we'll override this later if the plugin can be included without fatal error
ob_start();
include_once(WP_PLUGIN_DIR . '/' . $plugin);

if ( ! $silent ) {
do_action( 'activate_plugin', $plugin, $network_wide );
do_action( 'activate_' . $plugin, $network_wide );
}

if ( $network_wide ) {
$current[$plugin] = time();
update_site_option( 'active_sitewide_plugins', $current );
} else {
$current[] = $plugin;
sort($current);
update_option('active_plugins', $current);
}

if ( ! $silent ) {
do_action( 'activated_plugin', $plugin, $network_wide );
}

if ( ob_get_length() > 0 ) {
$output = ob_get_clean();
return new WP_Error('unexpected_output', __('The plugin generated unexpected output.'), $output);
}
ob_end_clean();
}

return null;
}

/**
* Deactivate a single plugin or multiple plugins.
*
* The deactivation hook is disabled by the plugin upgrader by using the $silent
* parameter.
*
* @since 2.5.0
*
* @param string|array $plugins Single plugin or list of plugins to deactivate.
* @param bool $silent Prevent calling deactivation hooks. Default is false.
* @param mixed $network_wide Whether to deactivate the plugin for all sites in the network.
* A value of null (the default) will deactivate plugins for both the site and the network.
*/
function deactivate_plugins( $plugins, $silent = false, $network_wide = null ) {
if ( is_multisite() )
$network_current = get_site_option( 'active_sitewide_plugins', array() );
$current = get_option( 'active_plugins', array() );
$do_blog = $do_network = false;

foreach ( (array) $plugins as $plugin ) {
$plugin = plugin_basename( trim( $plugin ) );
if ( ! is_plugin_active($plugin) )
continue;

$network_deactivating = false !== $network_wide && is_plugin_active_for_network( $plugin );

if ( ! $silent )
do_action( 'deactivate_plugin', $plugin, $network_deactivating );

if ( false !== $network_wide ) {
if ( is_plugin_active_for_network( $plugin ) ) {
$do_network = true;
unset( $network_current[ $plugin ] );
} elseif ( $network_wide ) {
continue;
}
}

if ( true !== $network_wide ) {
$key = array_search( $plugin, $current );
if ( false !== $key ) {
$do_blog = true;
unset( $current[ $key ] );
}
}

if ( ! $silent ) {
do_action( 'deactivate_' . $plugin, $network_deactivating );
do_action( 'deactivated_plugin', $plugin, $network_deactivating );
}
}

if ( $do_blog )
update_option('active_plugins', $current);
if ( $do_network )
update_site_option( 'active_sitewide_plugins', $network_current );
}

/**
* Activate multiple plugins.
*
* When WP_Error is returned, it does not mean that one of the plugins had
* errors. It means that one or more of the plugins file path was invalid.
*
* The execution will be halted as soon as one of the plugins has an error.
*
* @since 2.6.0
*
* @param string|array $plugins
* @param string $redirect Redirect to page after successful activation.
* @param bool $network_wide Whether to enable the plugin for all sites in the network.
* @param bool $silent Prevent calling activation hooks. Default is false.
* @return bool|WP_Error True when finished or WP_Error if there were errors during a plugin activation.
*/
function activate_plugins( $plugins, $redirect = '', $network_wide = false, $silent = false ) {
if ( !is_array($plugins) )
$plugins = array($plugins);

$errors = array();
foreach ( $plugins as $plugin ) {
if ( !empty($redirect) )
$redirect = add_query_arg('plugin', $plugin, $redirect);
$result = activate_plugin($plugin, $redirect, $network_wide, $silent);
if ( is_wp_error($result) )
$errors[$plugin] = $result;
}

if ( !empty($errors) )
return new WP_Error('plugins_invalid', __('One of the plugins is invalid.'), $errors);

return true;
}

/**
* Remove directory and files of a plugin for a single or list of plugin(s).
*
* If the plugins parameter list is empty, false will be returned. True when
* completed.
*
* @since 2.6.0
*
* @param array $plugins List of plugin
* @param string $redirect Redirect to page when complete.
* @return mixed
*/
function delete_plugins($plugins, $redirect = '' ) {
global $wp_filesystem;

if ( empty($plugins) )
return false;

$checked = array();
foreach( $plugins as $plugin )
$checked[] = 'checked[]=' . $plugin;

ob_start();
$url = wp_nonce_url('plugins.php?action=delete-selected&verify-delete=1&' . implode('&', $checked), 'bulk-plugins');
if ( false === ($credentials = request_filesystem_credentials($url)) ) {
$data = ob_get_contents();
ob_end_clean();
if ( ! empty($data) ){
include_once( ABSPATH . 'wp-admin/admin-header.php');
echo $data;
include( ABSPATH . 'wp-admin/admin-footer.php');
exit;
}
return;
}

if ( ! WP_Filesystem($credentials) ) {
request_filesystem_credentials($url, '', true); //Failed to connect, Error and request again
$data = ob_get_contents();
ob_end_clean();
if ( ! empty($data) ){
include_once( ABSPATH . 'wp-admin/admin-header.php');
echo $data;
include( ABSPATH . 'wp-admin/admin-footer.php');
exit;
}
return;
}

if ( ! is_object($wp_filesystem) )
return new WP_Error('fs_unavailable', __('Could not access filesystem.'));

if ( is_wp_error($wp_filesystem->errors) && $wp_filesystem->errors->get_error_code() )
return new WP_Error('fs_error', __('Filesystem error.'), $wp_filesystem->errors);

//Get the base plugin folder
$plugins_dir = $wp_filesystem->wp_plugins_dir();
if ( empty($plugins_dir) )
return new WP_Error('fs_no_plugins_dir', __('Unable to locate WordPress Plugin directory.'));

$plugins_dir = trailingslashit( $plugins_dir );

$errors = array();

foreach( $plugins as $plugin_file ) {
// Run Uninstall hook
if ( is_uninstallable_plugin( $plugin_file ) )
uninstall_plugin($plugin_file);

$this_plugin_dir = trailingslashit( dirname($plugins_dir . $plugin_file) );
// If plugin is in its own directory, recursively delete the directory.
if ( strpos($plugin_file, '/') && $this_plugin_dir != $plugins_dir ) //base check on if plugin includes directory separator AND that it's not the root plugin folder
$deleted = $wp_filesystem->delete($this_plugin_dir, true);
else
$deleted = $wp_filesystem->delete($plugins_dir . $plugin_file);

if ( ! $deleted )
$errors[] = $plugin_file;
}

if ( ! empty($errors) )
return new WP_Error('could_not_remove_plugin', sprintf(__('Could not fully remove the plugin(s) %s.'), implode(', ', $errors)) );

// Force refresh of plugin update information
if ( $current = get_site_transient('update_plugins') ) {
unset( $current->response[ $plugin_file ] );
set_site_transient('update_plugins', $current);
}

return true;
}

/**
* Validate active plugins
*
* Validate all active plugins, deactivates invalid and
* returns an array of deactivated ones.
*
* @since 2.5.0
* @return array invalid plugins, plugin as key, error as value
*/
function validate_active_plugins() {
$plugins = get_option( 'active_plugins', array() );
// validate vartype: array
if ( ! is_array( $plugins ) ) {
update_option( 'active_plugins', array() );
$plugins = array();
}

if ( is_multisite() && is_super_admin() ) {
$network_plugins = (array) get_site_option( 'active_sitewide_plugins', array() );
$plugins = array_merge( $plugins, array_keys( $network_plugins ) );
}

if ( empty( $plugins ) )
return;

$invalid = array();

// invalid plugins get deactivated
foreach ( $plugins as $plugin ) {
$result = validate_plugin( $plugin );
if ( is_wp_error( $result ) ) {
$invalid[$plugin] = $result;
deactivate_plugins( $plugin, true );
}
}
return $invalid;
}

/**
* Validate the plugin path.
*
* Checks that the file exists and {@link validate_file() is valid file}.
*
* @since 2.5.0
*
* @param string $plugin Plugin Path
* @return WP_Error|int 0 on success, WP_Error on failure.
*/
function validate_plugin($plugin) {
if ( validate_file($plugin) )
return new WP_Error('plugin_invalid', __('Invalid plugin path.'));
if ( ! file_exists(WP_PLUGIN_DIR . '/' . $plugin) )
return new WP_Error('plugin_not_found', __('Plugin file does not exist.'));

$installed_plugins = get_plugins();
if ( ! isset($installed_plugins[$plugin]) )
return new WP_Error('no_plugin_header', __('The plugin does not have a valid header.'));
return 0;
}

/**
* Whether the plugin can be uninstalled.
*
* @since 2.7.0
*
* @param string $plugin Plugin path to check.
* @return bool Whether plugin can be uninstalled.
*/
function is_uninstallable_plugin($plugin) {
$file = plugin_basename($plugin);

$uninstallable_plugins = (array) get_option('uninstall_plugins');
if ( isset( $uninstallable_plugins[$file] ) || file_exists( WP_PLUGIN_DIR . '/' . dirname($file) . '/uninstall.php' ) )
return true;

return false;
}

/**
* Uninstall a single plugin.
*
* Calls the uninstall hook, if it is available.
*
* @since 2.7.0
*
* @param string $plugin Relative plugin path from Plugin Directory.
*/
function uninstall_plugin($plugin) {
$file = plugin_basename($plugin);

$uninstallable_plugins = (array) get_option('uninstall_plugins');
if ( file_exists( WP_PLUGIN_DIR . '/' . dirname($file) . '/uninstall.php' ) ) {
if ( isset( $uninstallable_plugins[$file] ) ) {
unset($uninstallable_plugins[$file]);
update_option('uninstall_plugins', $uninstallable_plugins);
}
unset($uninstallable_plugins);

define('WP_UNINSTALL_PLUGIN', $file);
include WP_PLUGIN_DIR . '/' . dirname($file) . '/uninstall.php';

return true;
}

if ( isset( $uninstallable_plugins[$file] ) ) {
$callable = $uninstallable_plugins[$file];
unset($uninstallable_plugins[$file]);
update_option('uninstall_plugins', $uninstallable_plugins);
unset($uninstallable_plugins);

include WP_PLUGIN_DIR . '/' . $file;

add_action( 'uninstall_' . $file, $callable );
do_action( 'uninstall_' . $file );
}
}

//
// Menu
//

/**
* Add a top level menu page
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
* @param string $icon_url The url to the icon to be used for this menu. Using 'none' would leave div.wp-menu-image empty
* so an icon can be added as background with CSS.
* @param int $position The position in the menu order this one should appear
*
* @return string The resulting page's hook_suffix
*/
function add_menu_page( $page_title, $menu_title, $capability, $menu_slug, $function = '', $icon_url = '', $position = null ) {
global $menu, $admin_page_hooks, $_registered_pages, $_parent_pages;

$menu_slug = plugin_basename( $menu_slug );

$admin_page_hooks[$menu_slug] = sanitize_title( $menu_title );

$hookname = get_plugin_page_hookname( $menu_slug, '' );

if ( !empty( $function ) && !empty( $hookname ) && current_user_can( $capability ) )
add_action( $hookname, $function );

if ( empty($icon_url) ) {
$icon_url = 'none';
$icon_class = 'menu-icon-generic ';
} else {
$icon_url = set_url_scheme( $icon_url );
$icon_class = '';
}

$new_menu = array( $menu_title, $capability, $menu_slug, $page_title, 'menu-top ' . $icon_class . $hookname, $hookname, $icon_url );

if ( null === $position )
$menu[] = $new_menu;
else
$menu[$position] = $new_menu;

$_registered_pages[$hookname] = true;

// No parent as top level
$_parent_pages[$menu_slug] = false;

return $hookname;
}

/**
* Add a top level menu page in the 'objects' section
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
* @param string $icon_url The url to the icon to be used for this menu
*
* @return string The resulting page's hook_suffix
*/
function add_object_page( $page_title, $menu_title, $capability, $menu_slug, $function = '', $icon_url = '') {
global $_wp_last_object_menu;

$_wp_last_object_menu++;

return add_menu_page($page_title, $menu_title, $capability, $menu_slug, $function, $icon_url, $_wp_last_object_menu);
}

/**
* Add a top level menu page in the 'utility' section
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
* @param string $icon_url The url to the icon to be used for this menu
*
* @return string The resulting page's hook_suffix
*/
function add_utility_page( $page_title, $menu_title, $capability, $menu_slug, $function = '', $icon_url = '') {
global $_wp_last_utility_menu;

$_wp_last_utility_menu++;

return add_menu_page($page_title, $menu_title, $capability, $menu_slug, $function, $icon_url, $_wp_last_utility_menu);
}

/**
* Add a sub menu page
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $parent_slug The slug name for the parent menu (or the file name of a standard WordPress admin page)
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
global $submenu;
global $menu;
global $_wp_real_parent_file;
global $_wp_submenu_nopriv;
global $_registered_pages;
global $_parent_pages;

$menu_slug = plugin_basename( $menu_slug );
$parent_slug = plugin_basename( $parent_slug);

if ( isset( $_wp_real_parent_file[$parent_slug] ) )
$parent_slug = $_wp_real_parent_file[$parent_slug];

if ( !current_user_can( $capability ) ) {
$_wp_submenu_nopriv[$parent_slug][$menu_slug] = true;
return false;
}

// If the parent doesn't already have a submenu, add a link to the parent
// as the first item in the submenu. If the submenu file is the same as the
// parent file someone is trying to link back to the parent manually. In
// this case, don't automatically add a link back to avoid duplication.
if (!isset( $submenu[$parent_slug] ) && $menu_slug != $parent_slug ) {
foreach ( (array)$menu as $parent_menu ) {
if ( $parent_menu[2] == $parent_slug && current_user_can( $parent_menu[1] ) )
$submenu[$parent_slug][] = $parent_menu;
}
}

$submenu[$parent_slug][] = array ( $menu_title, $capability, $menu_slug, $page_title );

$hookname = get_plugin_page_hookname( $menu_slug, $parent_slug);
if (!empty ( $function ) && !empty ( $hookname ))
add_action( $hookname, $function );

$_registered_pages[$hookname] = true;
// backwards-compatibility for plugins using add_management page. See wp-admin/admin.php for redirect from edit.php to tools.php
if ( 'tools.php' == $parent_slug )
$_registered_pages[get_plugin_page_hookname( $menu_slug, 'edit.php')] = true;

// No parent as top level
$_parent_pages[$menu_slug] = $parent_slug;

return $hookname;
}

/**
* Add sub menu page to the tools main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_management_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
return add_submenu_page( 'tools.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
* Add sub menu page to the options main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_options_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
return add_submenu_page( 'options-general.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
* Add sub menu page to the themes main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_theme_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
return add_submenu_page( 'themes.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
* Add sub menu page to the plugins main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_plugins_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
return add_submenu_page( 'plugins.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
* Add sub menu page to the Users/Profile main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_users_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
if ( current_user_can('edit_users') )
$parent = 'users.php';
else
$parent = 'profile.php';
return add_submenu_page( $parent, $page_title, $menu_title, $capability, $menu_slug, $function );
}
/**
* Add sub menu page to the Dashboard main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_dashboard_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
return add_submenu_page( 'index.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
* Add sub menu page to the posts main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_posts_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
return add_submenu_page( 'edit.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
* Add sub menu page to the media main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_media_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
return add_submenu_page( 'upload.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
* Add sub menu page to the links main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_links_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
return add_submenu_page( 'link-manager.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
* Add sub menu page to the pages main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_pages_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
return add_submenu_page( 'edit.php?post_type=page', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
* Add sub menu page to the comments main menu.
*
* This function takes a capability which will be used to determine whether
* or not a page is included in the menu.
*
* The function which is hooked in to handle the output of the page must check
* that the user has the required capability as well.
*
* @param string $page_title The text to be displayed in the title tags of the page when the menu is selected
* @param string $menu_title The text to be used for the menu
* @param string $capability The capability required for this menu to be displayed to the user.
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param callback $function The function to be called to output the content for this page.
*
* @return string|bool The resulting page's hook_suffix, or false if the user does not have the capability required.
*/
function add_comments_page( $page_title, $menu_title, $capability, $menu_slug, $function = '' ) {
return add_submenu_page( 'edit-comments.php', $page_title, $menu_title, $capability, $menu_slug, $function );
}

/**
* Remove a top level admin menu
*
* @since 3.1.0
*
* @param string $menu_slug The slug of the menu
* @return array|bool The removed menu on success, False if not found
*/
function remove_menu_page( $menu_slug ) {
global $menu;

foreach ( $menu as $i => $item ) {
if ( $menu_slug == $item[2] ) {
unset( $menu[$i] );
return $item;
}
}

return false;
}

/**
* Remove an admin submenu
*
* @since 3.1.0
*
* @param string $menu_slug The slug for the parent menu
* @param string $submenu_slug The slug of the submenu
* @return array|bool The removed submenu on success, False if not found
*/
function remove_submenu_page( $menu_slug, $submenu_slug ) {
global $submenu;

if ( !isset( $submenu[$menu_slug] ) )
return false;

foreach ( $submenu[$menu_slug] as $i => $item ) {
if ( $submenu_slug == $item[2] ) {
unset( $submenu[$menu_slug][$i] );
return $item;
}
}

return false;
}

/**
* Get the url to access a particular menu page based on the slug it was registered with.
*
* If the slug hasn't been registered properly no url will be returned
*
* @since 3.0
*
* @param string $menu_slug The slug name to refer to this menu by (should be unique for this menu)
* @param bool $echo Whether or not to echo the url - default is true
* @return string the url
*/
function menu_page_url($menu_slug, $echo = true) {
global $_parent_pages;

if ( isset( $_parent_pages[$menu_slug] ) ) {
$parent_slug = $_parent_pages[$menu_slug];
if ( $parent_slug && ! isset( $_parent_pages[$parent_slug] ) ) {
$url = admin_url( add_query_arg( 'page', $menu_slug, $parent_slug ) );
} else {
$url = admin_url( 'admin.php?page=' . $menu_slug );
}
} else {
$url = '';
}

$url = esc_url($url);

if ( $echo )
echo $url;

return $url;
}

//
// Pluggable Menu Support -- Private
//

function get_admin_page_parent( $parent = '' ) {
global $parent_file;
global $menu;
global $submenu;
global $pagenow;
global $typenow;
global $plugin_page;
global $_wp_real_parent_file;
global $_wp_menu_nopriv;
global $_wp_submenu_nopriv;

if ( !empty ( $parent ) && 'admin.php' != $parent ) {
if ( isset( $_wp_real_parent_file[$parent] ) )
$parent = $_wp_real_parent_file[$parent];
return $parent;
}

/*
if ( !empty ( $parent_file ) ) {
if ( isset( $_wp_real_parent_file[$parent_file] ) )
$parent_file = $_wp_real_parent_file[$parent_file];

return $parent_file;
}
*/

if ( $pagenow == 'admin.php' && isset( $plugin_page ) ) {
foreach ( (array)$menu as $parent_menu ) {
if ( $parent_menu[2] == $plugin_page ) {
$parent_file = $plugin_page;
if ( isset( $_wp_real_parent_file[$parent_file] ) )
$parent_file = $_wp_real_parent_file[$parent_file];
return $parent_file;
}
}
if ( isset( $_wp_menu_nopriv[$plugin_page] ) ) {
$parent_file = $plugin_page;
if ( isset( $_wp_real_parent_file[$parent_file] ) )
$parent_file = $_wp_real_parent_file[$parent_file];
return $parent_file;
}
}

if ( isset( $plugin_page ) && isset( $_wp_submenu_nopriv[$pagenow][$plugin_page] ) ) {
$parent_file = $pagenow;
if ( isset( $_wp_real_parent_file[$parent_file] ) )
$parent_file = $_wp_real_parent_file[$parent_file];
return $parent_file;
}

foreach (array_keys( (array)$submenu ) as $parent) {
foreach ( $submenu[$parent] as $submenu_array ) {
if ( isset( $_wp_real_parent_file[$parent] ) )
$parent = $_wp_real_parent_file[$parent];
if ( !empty($typenow) && ($submenu_array[2] == "$pagenow?post_type=$typenow") ) {
$parent_file = $parent;
return $parent;
} elseif ( $submenu_array[2] == $pagenow && empty($typenow) && ( empty($parent_file) || false === strpos($parent_file, '?') ) ) {
$parent_file = $parent;
return $parent;
} else
if ( isset( $plugin_page ) && ($plugin_page == $submenu_array[2] ) ) {
$parent_file = $parent;
return $parent;
}
}
}

if ( empty($parent_file) )
$parent_file = '';
return '';
}

function get_admin_page_title() {
global $title;
global $menu;
global $submenu;
global $pagenow;
global $plugin_page;
global $typenow;

if ( ! empty ( $title ) )
return $title;

$hook = get_plugin_page_hook( $plugin_page, $pagenow );

$parent = $parent1 = get_admin_page_parent();

if ( empty ( $parent) ) {
foreach ( (array)$menu as $menu_array ) {
if ( isset( $menu_array[3] ) ) {
if ( $menu_array[2] == $pagenow ) {
$title = $menu_array[3];
return $menu_array[3];
} else
if ( isset( $plugin_page ) && ($plugin_page == $menu_array[2] ) && ($hook == $menu_array[3] ) ) {
$title = $menu_array[3];
return $menu_array[3];
}
} else {
$title = $menu_array[0];
return $title;
}
}
} else {
foreach ( array_keys( $submenu ) as $parent ) {
foreach ( $submenu[$parent] as $submenu_array ) {
if ( isset( $plugin_page ) &&
( $plugin_page == $submenu_array[2] ) &&
(
( $parent == $pagenow ) ||
( $parent == $plugin_page ) ||
( $plugin_page == $hook ) ||
( $pagenow == 'admin.php' && $parent1 != $submenu_array[2] ) ||
( !empty($typenow) && $parent == $pagenow . '?post_type=' . $typenow)
)
) {
$title = $submenu_array[3];
return $submenu_array[3];
}

if ( $submenu_array[2] != $pagenow || isset( $_GET['page'] ) ) // not the current page
continue;

if ( isset( $submenu_array[3] ) ) {
$title = $submenu_array[3];
return $submenu_array[3];
} else {
$title = $submenu_array[0];
return $title;
}
}
}
if ( empty ( $title ) ) {
foreach ( $menu as $menu_array ) {
if ( isset( $plugin_page ) &&
( $plugin_page == $menu_array[2] ) &&
( $pagenow == 'admin.php' ) &&
( $parent1 == $menu_array[2] ) )
{
$title = $menu_array[3];
return $menu_array[3];
}
}
}
}

return $title;
}

function get_plugin_page_hook( $plugin_page, $parent_page ) {
$hook = get_plugin_page_hookname( $plugin_page, $parent_page );
if ( has_action($hook) )
return $hook;
else
return null;
}

function get_plugin_page_hookname( $plugin_page, $parent_page ) {
global $admin_page_hooks;

$parent = get_admin_page_parent( $parent_page );

$page_type = 'admin';
if ( empty ( $parent_page ) || 'admin.php' == $parent_page || isset( $admin_page_hooks[$plugin_page] ) ) {
if ( isset( $admin_page_hooks[$plugin_page] ) )
$page_type = 'toplevel';
else
if ( isset( $admin_page_hooks[$parent] ))
$page_type = $admin_page_hooks[$parent];
} else if ( isset( $admin_page_hooks[$parent] ) ) {
$page_type = $admin_page_hooks[$parent];
}

$plugin_name = preg_replace( '!\.php!', '', $plugin_page );

return $page_type . '_page_' . $plugin_name;
}

function user_can_access_admin_page() {
global $pagenow;
global $menu;
global $submenu;
global $_wp_menu_nopriv;
global $_wp_submenu_nopriv;
global $plugin_page;
global $_registered_pages;

$parent = get_admin_page_parent();

if ( !isset( $plugin_page ) && isset( $_wp_submenu_nopriv[$parent][$pagenow] ) )
return false;

if ( isset( $plugin_page ) ) {
if ( isset( $_wp_submenu_nopriv[$parent][$plugin_page] ) )
return false;

$hookname = get_plugin_page_hookname($plugin_page, $parent);

if ( !isset($_registered_pages[$hookname]) )
return false;
}

if ( empty( $parent) ) {
if ( isset( $_wp_menu_nopriv[$pagenow] ) )
return false;
if ( isset( $_wp_submenu_nopriv[$pagenow][$pagenow] ) )
return false;
if ( isset( $plugin_page ) && isset( $_wp_submenu_nopriv[$pagenow][$plugin_page] ) )
return false;
if ( isset( $plugin_page ) && isset( $_wp_menu_nopriv[$plugin_page] ) )
return false;
foreach (array_keys( $_wp_submenu_nopriv ) as $key ) {
if ( isset( $_wp_submenu_nopriv[$key][$pagenow] ) )
return false;
if ( isset( $plugin_page ) && isset( $_wp_submenu_nopriv[$key][$plugin_page] ) )
return false;
}
return true;
}

if ( isset( $plugin_page ) && ( $plugin_page == $parent ) && isset( $_wp_menu_nopriv[$plugin_page] ) )
return false;

if ( isset( $submenu[$parent] ) ) {
foreach ( $submenu[$parent] as $submenu_array ) {
if ( isset( $plugin_page ) && ( $submenu_array[2] == $plugin_page ) ) {
if ( current_user_can( $submenu_array[1] ))
return true;
else
return false;
} else if ( $submenu_array[2] == $pagenow ) {
if ( current_user_can( $submenu_array[1] ))
return true;
else
return false;
}
}
}

foreach ( $menu as $menu_array ) {
if ( $menu_array[2] == $parent) {
if ( current_user_can( $menu_array[1] ))
return true;
else
return false;
}
}

return true;
}

/* Whitelist functions */

/**
* Register a setting and its sanitization callback
*
* @since 2.7.0
*
* @param string $option_group A settings group name. Should correspond to a whitelisted option key name.
* Default whitelisted option key names include "general," "discussion," and "reading," among others.
* @param string $option_name The name of an option to sanitize and save.
* @param unknown_type $sanitize_callback A callback function that sanitizes the option's value.
* @return unknown
*/
function register_setting( $option_group, $option_name, $sanitize_callback = '' ) {
global $new_whitelist_options;

if ( 'misc' == $option_group ) {
_deprecated_argument( __FUNCTION__, '3.0', sprintf( __( 'The "%s" options group has been removed. Use another settings group.' ), 'misc' ) );
$option_group = 'general';
}

if ( 'privacy' == $option_group ) {
_deprecated_argument( __FUNCTION__, '3.5', sprintf( __( 'The "%s" options group has been removed. Use another settings group.' ), 'privacy' ) );
$option_group = 'reading';
}

$new_whitelist_options[ $option_group ][] = $option_name;
if ( $sanitize_callback != '' )
add_filter( "sanitize_option_{$option_name}", $sanitize_callback );
}

/**
* Unregister a setting
*
* @since 2.7.0
*
* @param unknown_type $option_group
* @param unknown_type $option_name
* @param unknown_type $sanitize_callback
* @return unknown
*/
function unregister_setting( $option_group, $option_name, $sanitize_callback = '' ) {
global $new_whitelist_options;

if ( 'misc' == $option_group ) {
_deprecated_argument( __FUNCTION__, '3.0', sprintf( __( 'The "%s" options group has been removed. Use another settings group.' ), 'misc' ) );
$option_group = 'general';
}

if ( 'privacy' == $option_group ) {
_deprecated_argument( __FUNCTION__, '3.5', sprintf( __( 'The "%s" options group has been removed. Use another settings group.' ), 'privacy' ) );
$option_group = 'reading';
}

$pos = array_search( $option_name, (array) $new_whitelist_options );
if ( $pos !== false )
unset( $new_whitelist_options[ $option_group ][ $pos ] );
if ( $sanitize_callback != '' )
remove_filter( "sanitize_option_{$option_name}", $sanitize_callback );
}

/**
* {@internal Missing Short Description}}
*
* @since 2.7.0
*
* @param unknown_type $options
* @return unknown
*/
function option_update_filter( $options ) {
global $new_whitelist_options;

if ( is_array( $new_whitelist_options ) )
$options = add_option_whitelist( $new_whitelist_options, $options );

return $options;
}
add_filter( 'whitelist_options', 'option_update_filter' );

/**
* {@internal Missing Short Description}}
*
* @since 2.7.0
*
* @param unknown_type $new_options
* @param unknown_type $options
* @return unknown
*/
function add_option_whitelist( $new_options, $options = '' ) {
if ( $options == '' )
global $whitelist_options;
else
$whitelist_options = $options;

foreach ( $new_options as $page => $keys ) {
foreach ( $keys as $key ) {
if ( !isset($whitelist_options[ $page ]) || !is_array($whitelist_options[ $page ]) ) {
$whitelist_options[ $page ] = array();
$whitelist_options[ $page ][] = $key;
} else {
$pos = array_search( $key, $whitelist_options[ $page ] );
if ( $pos === false )
$whitelist_options[ $page ][] = $key;
}
}
}

return $whitelist_options;
}

/**
* {@internal Missing Short Description}}
*
* @since 2.7.0
*
* @param unknown_type $del_options
* @param unknown_type $options
* @return unknown
*/
function remove_option_whitelist( $del_options, $options = '' ) {
if ( $options == '' )
global $whitelist_options;
else
$whitelist_options = $options;

foreach ( $del_options as $page => $keys ) {
foreach ( $keys as $key ) {
if ( isset($whitelist_options[ $page ]) && is_array($whitelist_options[ $page ]) ) {
$pos = array_search( $key, $whitelist_options[ $page ] );
if ( $pos !== false )
unset( $whitelist_options[ $page ][ $pos ] );
}
}
}

return $whitelist_options;
}

/**
* Output nonce, action, and option_page fields for a settings page.
*
* @since 2.7.0
*
* @param string $option_group A settings group name. This should match the group name used in register_setting().
*/
function settings_fields($option_group) {
echo "<input type='hidden' name='option_page' value='" . esc_attr($option_group) . "' />";
echo '<input type="hidden" name="action" value="update" />';
wp_nonce_field("$option_group-options");
}
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