/** * The plugin API is located in this file, which allows for creating actions * and filters and hooking functions, and methods. The functions or methods will * then be run when the action or filter is called. * * The API callback examples reference functions, but can be methods of classes. * To hook methods, you'll need to pass an array one of two ways. * * Any of the syntaxes explained in the PHP documentation for the * {@link http://us2.php.net/manual/en/language.pseudo-types.php#language.types.callback 'callback'} * type are valid. * * Also see the {@link http://codex.wordpress.org/Plugin_API Plugin API} for * more information and examples on how to use a lot of these functions. * * @package WordPress * @subpackage Plugin * @since 1.5 */ /** * Hooks a function or method to a specific filter action. * * Filters are the hooks that WordPress launches to modify text of various types * before adding it to the database or sending it to the browser screen. Plugins * can specify that one or more of its PHP functions is executed to * modify specific types of text at these times, using the Filter API. * * To use the API, the following code should be used to bind a callback to the * filter. * * * function example_hook($example) { echo $example; } * add_filter('example_filter', 'example_hook'); * * * In WordPress 1.5.1+, hooked functions can take extra arguments that are set * when the matching do_action() or apply_filters() call is run. The * $accepted_args allow for calling functions only when the number of args * match. Hooked functions can take extra arguments that are set when the * matching do_action() or apply_filters() call is run. For example, the action * comment_id_not_found will pass any functions that hook onto it the ID of the * requested comment. * * Note: the function will return true no matter if the * function was hooked fails or not. There are no checks for whether the * function exists beforehand and no checks to whether the $function_to_add * is even a string. It is up to you to take care and this is done for * optimization purposes, so everything is as quick as possible. * * @package WordPress * @subpackage Plugin * @since 0.71 * @global array $wp_filter Stores all of the filters added in the form of * wp_filter['tag']['array of priorities']['array of functions serialized']['array of ['array (functions, accepted_args)']'] * @global array $merged_filters Tracks the tags that need to be merged for later. If the hook is added, it doesn't need to run through that process. * * @param string $tag The name of the filter to hook the $function_to_add to. * @param callback $function_to_add The name of the function to be called when the filter is applied. * @param int $priority optional. Used to specify the order in which the functions associated with a particular action are executed (default: 10). Lower numbers correspond with earlier execution, and functions with the same priority are executed in the order in which they were added to the action. * @param int $accepted_args optional. The number of arguments the function accept (default 1). * @return boolean true */ function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1) { global $wp_filter, $merged_filters; $idx = _wp_filter_build_unique_id($tag, $function_to_add, $priority); $wp_filter[$tag][$priority][$idx] = array('function' => $function_to_add, 'accepted_args' => $accepted_args); unset( $merged_filters[ $tag ] ); return true; } /** * Check if any filter has been registered for a hook. * * @package WordPress * @subpackage Plugin * @since 2.5 * @global array $wp_filter Stores all of the filters * * @param string $tag The name of the filter hook. * @param callback $function_to_check optional. * @return mixed If $function_to_check is omitted, returns boolean for whether the hook has anything registered. * When checking a specific function, the priority of that hook is returned, or false if the function is not attached. * When using the $function_to_check argument, this function may return a non-boolean value that evaluates to false * (e.g.) 0, so use the === operator for testing the return value. */ function has_filter($tag, $function_to_check = false) { global $wp_filter; $has = !empty($wp_filter[$tag]); if ( false === $function_to_check || false == $has ) return $has; if ( !$idx = _wp_filter_build_unique_id($tag, $function_to_check, false) ) return false; foreach ( (array) array_keys($wp_filter[$tag]) as $priority ) { if ( isset($wp_filter[$tag][$priority][$idx]) ) return $priority; } return false; } /** * Call the functions added to a filter hook. * * The callback functions attached to filter hook $tag are invoked by calling * this function. This function can be used to create a new filter hook by * simply calling this function with the name of the new hook specified using * the $tag parameter. * * The function allows for additional arguments to be added and passed to hooks. * * function example_hook($string, $arg1, $arg2) * { * //Do stuff * return $string; * } * $value = apply_filters('example_filter', 'filter me', 'arg1', 'arg2'); * * * @package WordPress * @subpackage Plugin * @since 0.71 * @global array $wp_filter Stores all of the filters * @global array $merged_filters Merges the filter hooks using this function. * @global array $wp_current_filter stores the list of current filters with the current one last * * @param string $tag The name of the filter hook. * @param mixed $value The value on which the filters hooked to $tag are applied on. * @param mixed $var,... Additional variables passed to the functions hooked to $tag. * @return mixed The filtered value after all hooked functions are applied to it. */ function apply_filters($tag, $value) { global $wp_filter, $merged_filters, $wp_current_filter; $args = array(); // Do 'all' actions first if ( isset($wp_filter['all']) ) { $wp_current_filter[] = $tag; $args = func_get_args(); _wp_call_all_hook($args); } if ( !isset($wp_filter[$tag]) ) { if ( isset($wp_filter['all']) ) array_pop($wp_current_filter); return $value; } if ( !isset($wp_filter['all']) ) $wp_current_filter[] = $tag; // Sort if ( !isset( $merged_filters[ $tag ] ) ) { ksort($wp_filter[$tag]); $merged_filters[ $tag ] = true; } reset( $wp_filter[ $tag ] ); if ( empty($args) ) $args = func_get_args(); do { foreach( (array) current($wp_filter[$tag]) as $the_ ) if ( !is_null($the_['function']) ){ $args[1] = $value; $value = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args'])); } } while ( next($wp_filter[$tag]) !== false ); array_pop( $wp_current_filter ); return $value; } /** * Execute functions hooked on a specific filter hook, specifying arguments in an array. * * @see apply_filters() This function is identical, but the arguments passed to the * functions hooked to $tag are supplied using an array. * * @package WordPress * @subpackage Plugin * @since 3.0.0 * @global array $wp_filter Stores all of the filters * @global array $merged_filters Merges the filter hooks using this function. * @global array $wp_current_filter stores the list of current filters with the current one last * * @param string $tag The name of the filter hook. * @param array $args The arguments supplied to the functions hooked to $tag * @return mixed The filtered value after all hooked functions are applied to it. */ function apply_filters_ref_array($tag, $args) { global $wp_filter, $merged_filters, $wp_current_filter; // Do 'all' actions first if ( isset($wp_filter['all']) ) { $wp_current_filter[] = $tag; $all_args = func_get_args(); _wp_call_all_hook($all_args); } if ( !isset($wp_filter[$tag]) ) { if ( isset($wp_filter['all']) ) array_pop($wp_current_filter); return $args[0]; } if ( !isset($wp_filter['all']) ) $wp_current_filter[] = $tag; // Sort if ( !isset( $merged_filters[ $tag ] ) ) { ksort($wp_filter[$tag]); $merged_filters[ $tag ] = true; } reset( $wp_filter[ $tag ] ); do { foreach( (array) current($wp_filter[$tag]) as $the_ ) if ( !is_null($the_['function']) ) $args[0] = call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args'])); } while ( next($wp_filter[$tag]) !== false ); array_pop( $wp_current_filter ); return $args[0]; } /** * Removes a function from a specified filter hook. * * This function removes a function attached to a specified filter hook. This * method can be used to remove default functions attached to a specific filter * hook and possibly replace them with a substitute. * * To remove a hook, the $function_to_remove and $priority arguments must match * when the hook was added. This goes for both filters and actions. No warning * will be given on removal failure. * * @package WordPress * @subpackage Plugin * @since 1.2 * * @param string $tag The filter hook to which the function to be removed is hooked. * @param callback $function_to_remove The name of the function which should be removed. * @param int $priority optional. The priority of the function (default: 10). * @param int $accepted_args optional. The number of arguments the function accepts (default: 1). * @return boolean Whether the function existed before it was removed. */ function remove_filter( $tag, $function_to_remove, $priority = 10 ) { $function_to_remove = _wp_filter_build_unique_id($tag, $function_to_remove, $priority); $r = isset($GLOBALS['wp_filter'][$tag][$priority][$function_to_remove]); if ( true === $r) { unset($GLOBALS['wp_filter'][$tag][$priority][$function_to_remove]); if ( empty($GLOBALS['wp_filter'][$tag][$priority]) ) unset($GLOBALS['wp_filter'][$tag][$priority]); unset($GLOBALS['merged_filters'][$tag]); } return $r; } /** * Remove all of the hooks from a filter. * * @since 2.7 * * @param string $tag The filter to remove hooks from. * @param int $priority The priority number to remove. * @return bool True when finished. */ function remove_all_filters($tag, $priority = false) { global $wp_filter, $merged_filters; if( isset($wp_filter[$tag]) ) { if( false !== $priority && isset($wp_filter[$tag][$priority]) ) unset($wp_filter[$tag][$priority]); else unset($wp_filter[$tag]); } if( isset($merged_filters[$tag]) ) unset($merged_filters[$tag]); return true; } /** * Retrieve the name of the current filter or action. * * @package WordPress * @subpackage Plugin * @since 2.5 * * @return string Hook name of the current filter or action. */ function current_filter() { global $wp_current_filter; return end( $wp_current_filter ); } /** * Hooks a function on to a specific action. * * Actions are the hooks that the WordPress core launches at specific points * during execution, or when specific events occur. Plugins can specify that * one or more of its PHP functions are executed at these points, using the * Action API. * * @uses add_filter() Adds an action. Parameter list and functionality are the same. * * @package WordPress * @subpackage Plugin * @since 1.2 * * @param string $tag The name of the action to which the $function_to_add is hooked. * @param callback $function_to_add The name of the function you wish to be called. * @param int $priority optional. Used to specify the order in which the functions associated with a particular action are executed (default: 10). Lower numbers correspond with earlier execution, and functions with the same priority are executed in the order in which they were added to the action. * @param int $accepted_args optional. The number of arguments the function accept (default 1). */ function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1) { return add_filter($tag, $function_to_add, $priority, $accepted_args); } /** * Execute functions hooked on a specific action hook. * * This function invokes all functions attached to action hook $tag. It is * possible to create new action hooks by simply calling this function, * specifying the name of the new hook using the $tag parameter. * * You can pass extra arguments to the hooks, much like you can with * apply_filters(). * * @see apply_filters() This function works similar with the exception that * nothing is returned and only the functions or methods are called. * * @package WordPress * @subpackage Plugin * @since 1.2 * @global array $wp_filter Stores all of the filters * @global array $wp_actions Increments the amount of times action was triggered. * * @param string $tag The name of the action to be executed. * @param mixed $arg,... Optional additional arguments which are passed on to the functions hooked to the action. * @return null Will return null if $tag does not exist in $wp_filter array */ function do_action($tag, $arg = '') { global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter; if ( ! isset($wp_actions) ) $wp_actions = array(); if ( ! isset($wp_actions[$tag]) ) $wp_actions[$tag] = 1; else ++$wp_actions[$tag]; // Do 'all' actions first if ( isset($wp_filter['all']) ) { $wp_current_filter[] = $tag; $all_args = func_get_args(); _wp_call_all_hook($all_args); } if ( !isset($wp_filter[$tag]) ) { if ( isset($wp_filter['all']) ) array_pop($wp_current_filter); return; } if ( !isset($wp_filter['all']) ) $wp_current_filter[] = $tag; $args = array(); if ( is_array($arg) && 1 == count($arg) && isset($arg[0]) && is_object($arg[0]) ) // array(&$this) $args[] =& $arg[0]; else $args[] = $arg; for ( $a = 2; $a < func_num_args(); $a++ ) $args[] = func_get_arg($a); // Sort if ( !isset( $merged_filters[ $tag ] ) ) { ksort($wp_filter[$tag]); $merged_filters[ $tag ] = true; } reset( $wp_filter[ $tag ] ); do { foreach ( (array) current($wp_filter[$tag]) as $the_ ) if ( !is_null($the_['function']) ) call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args'])); } while ( next($wp_filter[$tag]) !== false ); array_pop($wp_current_filter); } /** * Retrieve the number of times an action is fired. * * @package WordPress * @subpackage Plugin * @since 2.1 * @global array $wp_actions Increments the amount of times action was triggered. * * @param string $tag The name of the action hook. * @return int The number of times action hook $tag is fired */ function did_action($tag) { global $wp_actions; if ( ! isset( $wp_actions ) || ! isset( $wp_actions[$tag] ) ) return 0; return $wp_actions[$tag]; } /** * Execute functions hooked on a specific action hook, specifying arguments in an array. * * @see do_action() This function is identical, but the arguments passed to the * functions hooked to $tag are supplied using an array. * * @package WordPress * @subpackage Plugin * @since 2.1 * @global array $wp_filter Stores all of the filters * @global array $wp_actions Increments the amount of times action was triggered. * * @param string $tag The name of the action to be executed. * @param array $args The arguments supplied to the functions hooked to $tag * @return null Will return null if $tag does not exist in $wp_filter array */ function do_action_ref_array($tag, $args) { global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter; if ( ! isset($wp_actions) ) $wp_actions = array(); if ( ! isset($wp_actions[$tag]) ) $wp_actions[$tag] = 1; else ++$wp_actions[$tag]; // Do 'all' actions first if ( isset($wp_filter['all']) ) { $wp_current_filter[] = $tag; $all_args = func_get_args(); _wp_call_all_hook($all_args); } if ( !isset($wp_filter[$tag]) ) { if ( isset($wp_filter['all']) ) array_pop($wp_current_filter); return; } if ( !isset($wp_filter['all']) ) $wp_current_filter[] = $tag; // Sort if ( !isset( $merged_filters[ $tag ] ) ) { ksort($wp_filter[$tag]); $merged_filters[ $tag ] = true; } reset( $wp_filter[ $tag ] ); do { foreach( (array) current($wp_filter[$tag]) as $the_ ) if ( !is_null($the_['function']) ) call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args'])); } while ( next($wp_filter[$tag]) !== false ); array_pop($wp_current_filter); } /** * Check if any action has been registered for a hook. * * @package WordPress * @subpackage Plugin * @since 2.5 * @see has_filter() has_action() is an alias of has_filter(). * * @param string $tag The name of the action hook. * @param callback $function_to_check optional. * @return mixed If $function_to_check is omitted, returns boolean for whether the hook has anything registered. * When checking a specific function, the priority of that hook is returned, or false if the function is not attached. * When using the $function_to_check argument, this function may return a non-boolean value that evaluates to false * (e.g.) 0, so use the === operator for testing the return value. */ function has_action($tag, $function_to_check = false) { return has_filter($tag, $function_to_check); } /** * Removes a function from a specified action hook. * * This function removes a function attached to a specified action hook. This * method can be used to remove default functions attached to a specific filter * hook and possibly replace them with a substitute. * * @package WordPress * @subpackage Plugin * @since 1.2 * * @param string $tag The action hook to which the function to be removed is hooked. * @param callback $function_to_remove The name of the function which should be removed. * @param int $priority optional The priority of the function (default: 10). * @return boolean Whether the function is removed. */ function remove_action( $tag, $function_to_remove, $priority = 10 ) { return remove_filter( $tag, $function_to_remove, $priority ); } /** * Remove all of the hooks from an action. * * @since 2.7 * * @param string $tag The action to remove hooks from. * @param int $priority The priority number to remove them from. * @return bool True when finished. */ function remove_all_actions($tag, $priority = false) { return remove_all_filters($tag, $priority); } // // Functions for handling plugins. // /** * Gets the basename of a plugin. * * This method extracts the name of a plugin from its filename. * * @package WordPress * @subpackage Plugin * @since 1.5 * * @access private * * @param string $file The filename of plugin. * @return string The name of a plugin. * @uses WP_PLUGIN_DIR */ function plugin_basename($file) { $file = str_replace('\\','/',$file); // sanitize for Win32 installs $file = preg_replace('|/+|','/', $file); // remove any duplicate slash $plugin_dir = str_replace('\\','/',WP_PLUGIN_DIR); // sanitize for Win32 installs $plugin_dir = preg_replace('|/+|','/', $plugin_dir); // remove any duplicate slash $mu_plugin_dir = str_replace('\\','/',WPMU_PLUGIN_DIR); // sanitize for Win32 installs $mu_plugin_dir = preg_replace('|/+|','/', $mu_plugin_dir); // remove any duplicate slash $file = preg_replace('#^' . preg_quote($plugin_dir, '#') . '/|^' . preg_quote($mu_plugin_dir, '#') . '/#','',$file); // get relative path from plugins dir $file = trim($file, '/'); return $file; } /** * Gets the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in * @package WordPress * @subpackage Plugin * @since 2.8 * * @param string $file The filename of the plugin (__FILE__) * @return string the filesystem path of the directory that contains the plugin */ function plugin_dir_path( $file ) { return trailingslashit( dirname( $file ) ); } /** * Gets the URL directory path (with trailing slash) for the plugin __FILE__ passed in * @package WordPress * @subpackage Plugin * @since 2.8 * * @param string $file The filename of the plugin (__FILE__) * @return string the URL path of the directory that contains the plugin */ function plugin_dir_url( $file ) { return trailingslashit( plugins_url( '', $file ) ); } /** * Set the activation hook for a plugin. * * When a plugin is activated, the action 'activate_PLUGINNAME' hook is * activated. In the name of this hook, PLUGINNAME is replaced with the name of * the plugin, including the optional subdirectory. For example, when the plugin * is located in wp-content/plugin/sampleplugin/sample.php, then the name of * this hook will become 'activate_sampleplugin/sample.php'. When the plugin * consists of only one file and is (as by default) located at * wp-content/plugin/sample.php the name of this hook will be * 'activate_sample.php'. * * @package WordPress * @subpackage Plugin * @since 2.0 * * @param string $file The filename of the plugin including the path. * @param callback $function the function hooked to the 'activate_PLUGIN' action. */ function register_activation_hook($file, $function) { $file = plugin_basename($file); add_action('activate_' . $file, $function); } /** * Set the deactivation hook for a plugin. * * When a plugin is deactivated, the action 'deactivate_PLUGINNAME' hook is * deactivated. In the name of this hook, PLUGINNAME is replaced with the name * of the plugin, including the optional subdirectory. For example, when the * plugin is located in wp-content/plugin/sampleplugin/sample.php, then * the name of this hook will become 'activate_sampleplugin/sample.php'. * * When the plugin consists of only one file and is (as by default) located at * wp-content/plugin/sample.php the name of this hook will be * 'activate_sample.php'. * * @package WordPress * @subpackage Plugin * @since 2.0 * * @param string $file The filename of the plugin including the path. * @param callback $function the function hooked to the 'activate_PLUGIN' action. */ function register_deactivation_hook($file, $function) { $file = plugin_basename($file); add_action('deactivate_' . $file, $function); } /** * Set the uninstallation hook for a plugin. * * Registers the uninstall hook that will be called when the user clicks on the * uninstall link that calls for the plugin to uninstall itself. The link won't * be active unless the plugin hooks into the action. * * The plugin should not run arbitrary code outside of functions, when * registering the uninstall hook. In order to run using the hook, the plugin * will have to be included, which means that any code laying outside of a * function will be run during the uninstall process. The plugin should not * hinder the uninstall process. * * If the plugin can not be written without running code within the plugin, then * the plugin should create a file named 'uninstall.php' in the base plugin * folder. This file will be called, if it exists, during the uninstall process * bypassing the uninstall hook. The plugin, when using the 'uninstall.php' * should always check for the 'WP_UNINSTALL_PLUGIN' constant, before * executing. * * @since 2.7 * * @param string $file * @param callback $callback The callback to run when the hook is called. Must be a static method or function. */ function register_uninstall_hook( $file, $callback ) { if ( is_array( $callback ) && is_object( $callback[0] ) ) { _doing_it_wrong( __FUNCTION__, __( 'Only a static class method or function can be used in an uninstall hook.' ), '3.1' ); return; } // The option should not be autoloaded, because it is not needed in most // cases. Emphasis should be put on using the 'uninstall.php' way of // uninstalling the plugin. $uninstallable_plugins = (array) get_option('uninstall_plugins'); $uninstallable_plugins[plugin_basename($file)] = $callback; update_option('uninstall_plugins', $uninstallable_plugins); } /** * Calls the 'all' hook, which will process the functions hooked into it. * * The 'all' hook passes all of the arguments or parameters that were used for * the hook, which this function was called for. * * This function is used internally for apply_filters(), do_action(), and * do_action_ref_array() and is not meant to be used from outside those * functions. This function does not check for the existence of the all hook, so * it will fail unless the all hook exists prior to this function call. * * @package WordPress * @subpackage Plugin * @since 2.5 * @access private * * @uses $wp_filter Used to process all of the functions in the 'all' hook * * @param array $args The collected parameters from the hook that was called. * @param string $hook Optional. The hook name that was used to call the 'all' hook. */ function _wp_call_all_hook($args) { global $wp_filter; reset( $wp_filter['all'] ); do { foreach( (array) current($wp_filter['all']) as $the_ ) if ( !is_null($the_['function']) ) call_user_func_array($the_['function'], $args); } while ( next($wp_filter['all']) !== false ); } /** * Build Unique ID for storage and retrieval. * * The old way to serialize the callback caused issues and this function is the * solution. It works by checking for objects and creating an a new property in * the class to keep track of the object and new objects of the same class that * need to be added. * * It also allows for the removal of actions and filters for objects after they * change class properties. It is possible to include the property $wp_filter_id * in your class and set it to "null" or a number to bypass the workaround. * However this will prevent you from adding new classes and any new classes * will overwrite the previous hook by the same class. * * Functions and static method callbacks are just returned as strings and * shouldn't have any speed penalty. * * @package WordPress * @subpackage Plugin * @access private * @since 2.2.3 * @link http://trac.wordpress.org/ticket/3875 * * @global array $wp_filter Storage for all of the filters and actions * @param string $tag Used in counting how many hooks were applied * @param callback $function Used for creating unique id * @param int|bool $priority Used in counting how many hooks were applied. If === false and $function is an object reference, we return the unique id only if it already has one, false otherwise. * @return string|bool Unique ID for usage as array key or false if $priority === false and $function is an object reference, and it does not already have a unique id. */ function _wp_filter_build_unique_id($tag, $function, $priority) { global $wp_filter; static $filter_id_count = 0; if ( is_string($function) ) return $function; if ( is_object($function) ) { // Closures are currently implemented as objects $function = array( $function, '' ); } else { $function = (array) $function; } if (is_object($function[0]) ) { // Object Class Calling if ( function_exists('spl_object_hash') ) { return spl_object_hash($function[0]) . $function[1]; } else { $obj_idx = get_class($function[0]).$function[1]; if ( !isset($function[0]->wp_filter_id) ) { if ( false === $priority ) return false; $obj_idx .= isset($wp_filter[$tag][$priority]) ? count((array)$wp_filter[$tag][$priority]) : $filter_id_count; $function[0]->wp_filter_id = $filter_id_count; ++$filter_id_count; } else { $obj_idx .= $function[0]->wp_filter_id; } return $obj_idx; } } else if ( is_string($function[0]) ) { // Static Calling return $function[0].$function[1]; } }
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