phpdoc for plugin API. Props darkdragon. fixes #5225
git-svn-id: http://svn.automattic.com/wordpress/trunk@6276 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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ryan
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<?php
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/**
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* The plugin API is located in this file, which allows for creating actions
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* and filters and hooking functions, and methods. The functions or methods will
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* then be run when the action or filter is called.
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*
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* The API callback examples reference functions, but can be methods of classes.
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* To hook methods, you'll need to pass an array one of two ways.
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*
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* For static methods (you won't have access to the <tt>$this</tt> variable in the
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* method):
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* <code>array('class_name', 'method_name');</code>
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*
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* The second method will need the reference to the object to have access to the
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* method.
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* <code>array(&$this, 'method_name');</code>
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* <code>
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* $obj = new myObject();
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* array(&$obj, 'method_name');
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* </code>
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* Any of the syntaxes explained in the PHP documentation for the
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* {@link http://us2.php.net/manual/en/language.pseudo-types.php#language.types.callback 'callback' type} are valid.
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*
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* Also see the {@link http://codex.wordpress.org/Plugin_API Plugin API} for more information
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* and examples on how to use a lot of these functions.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 1.5
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*/
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/**
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* Hooks a function to a specific filter action.
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* Hooks a function or method to a specific filter action.
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*
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* Filters are the hooks that WordPress launches to modify text of various types
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* before adding it to the database or sending it to the browser screen. Plugins
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* can specify that one or more of its PHP functions is executed to
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* modify specific types of text at these times, using the Filter API.
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* See the [Plugin API] for a list of filter hooks.
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*
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* To use the API, the following code should be used to bind a callback to the filter
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* <code>
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* function example_hook($example) { echo $example; }
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*
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* add_filter('example_filter', 'example_hook');
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* </code>
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*
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* In WordPress 1.5.1+, hooked functions can take extra arguments that are set when
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* the matching do_action() or apply_filters() call is run. The <tt>$accepted_args
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* allow for calling functions only when the number of args match. Hooked functions
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* can take extra arguments that are set when the matching <tt>do_action()</tt> or
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* <tt>apply_filters()</tt> call is run. For example, the action <tt>comment_id_not_found</tt>
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* will pass any functions that hook onto it the ID of the requested comment.
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*
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* <strong>Note:</strong> the function will return true no matter if the function was hooked
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* fails or not. There are no checks for whether the function exists beforehand and no checks
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* to whether the <tt>$function_to_add is even a string. It is up to you to take care and
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* this is done for optimization purposes, so everything is as quick as possible.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 1.5
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* @global array $wp_filter Stores all of the filters added in the form of
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* wp_filter['tag']['array of priorities']['array of functions serialized']['array of ['array (functions, accepted_args)]']
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* @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.
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*
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* @param string $tag The name of the filter to hook the <tt>$function_to_add</tt> to.
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* @param callback $function_to_add The name of the function to be called when the filter is applied.
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* @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.
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* @param int $accepted_args optional. The number of arguments the function accept (default 1). In WordPress 1.5.1+, hooked functions can take extra arguments that are set when the matching do_action() or apply_filters() call is run.
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* @return boolean true if the <tt>$function_to_add</tt> is added succesfully to filter <tt>$tag</tt>. How many arguments your function takes. In WordPress 1.5.1+, hooked functions can take extra arguments that are set when the matching <tt>do_action()</tt> or <tt>apply_filters()</tt> call is run. For example, the action <tt>comment_id_not_found</tt> will pass any functions that hook onto it the ID of the requested comment.
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* @param int $accepted_args optional. The number of arguments the function accept (default 1).
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* @return boolean true
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*/
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function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
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global $wp_filter, $merged_filters;
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// So the format is wp_filter['tag']['array of priorities']['array of functions serialized']['array of ['array (functions, accepted_args)]']
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$idx = _wp_filter_build_unique_id($tag, $function_to_add, $priority);
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$wp_filter[$tag][$priority][$idx] = array('function' => $function_to_add, 'accepted_args' => $accepted_args);
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//$wp_filter[$tag][$priority][serialize($function_to_add)] = array('function' => $function_to_add, 'accepted_args' => $accepted_args);
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unset( $merged_filters[ $tag ] );
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return true;
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}
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@ -33,20 +85,35 @@ function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1)
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* calling this function. This function can be used to create a new filter hook
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* by simply calling this function with the name of the new hook specified using
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* the <tt>$tag</a> parameter.
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* @uses merge_filters Merges the filter hooks using this function.
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*
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* The function allows for additional arguments to be added and passed to hooks.
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* <code>
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* function example_hook($string, $arg1, $arg2)
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* {
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* //Do stuff
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* }
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* $value = apply_filters('example_filter', 'filter me', 'arg1', 'arg2');
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* </code>
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 1.5
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* @global array $wp_filter Stores all of the filters
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* @global array $merge_filters Merges the filter hooks using this function.
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*
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* @param string $tag The name of the filter hook.
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* @param string $string The text on which the filters hooked to <tt>$tag</tt> are applied on.
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* @param string $value The value on which the filters hooked to <tt>$tag</tt> are applied on.
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* @param mixed $var,... Additional variables passed to the functions hooked to <tt>$tag</tt>.
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* @return string The text in <tt>$string</tt> after all hooked functions are applied to it.
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*/
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function apply_filters($tag, $string) {
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function apply_filters($tag, $value) {
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global $wp_filter, $merged_filters;
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if ( !isset( $merged_filters[ $tag ] ) )
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merge_filters($tag);
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if ( !isset($wp_filter[$tag]) )
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return $string;
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return $value;
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reset( $wp_filter[ $tag ] );
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@ -55,13 +122,13 @@ function apply_filters($tag, $string) {
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do{
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foreach( (array) current($wp_filter[$tag]) as $the_ )
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if ( !is_null($the_['function']) ){
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$args[1] = $string;
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$string = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args']));
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$args[1] = $value;
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$value = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args']));
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}
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} while ( next($wp_filter[$tag]) !== false );
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return $string;
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return $value;
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}
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/**
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@ -70,7 +137,17 @@ function apply_filters($tag, $string) {
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* It is possible to defined generic filter functions using the filter hook
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* <em>all</e>. These functions are called for every filter tag. This function
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* merges the functions attached to the <em>all</em> hook with the functions
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* of a specific hoook defined by <tt>$tag</tt>.
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* of a specific hook defined by <tt>$tag</tt>.
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*
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* Bugged if you hook into 'all' tag, then you <strong>will</strong> lose all priority
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* information. {@link http://trac.wordpress.org/ticket/4715 Bug #4715} for more information.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 1.5
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* @global array $wp_filter Stores all of the filters
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* @global array $merge_filters Merges the filter hooks using this function.
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*
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* @param string $tag The filter hook of which the functions should be merged.
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*/
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function merge_filters($tag) {
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@ -92,11 +169,20 @@ function merge_filters($tag) {
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* This function removes a function attached to a specified filter hook. This
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* method can be used to remove default functions attached to a specific filter
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* hook and possibly replace them with a substitute.
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*
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* To remove a hook, the <tt>$function_to_remove</tt> and <tt>$priority</tt> arguments
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* must match when the hook was added. This goes for both filters and actions. No warning
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* will be given on removal failure.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 1.5
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*
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* @param string $tag The filter hook to which the function to be removed is hooked.
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* @param callback $function_to_remove The name of the function which should be removed.
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* @param int $priority optional. The priority of the function (default: 10).
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* @param int $accepted_args optional. The number of arguments the function accpets (default: 1).
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* @return boolean Whether the function is removed.
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* @return boolean Whether the function existed before it was removed.
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*/
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function remove_filter($tag, $function_to_remove, $priority = 10, $accepted_args = 1) {
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$function_to_remove = _wp_filter_build_unique_id($tag, $function_to_remove, $priority);
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@ -117,11 +203,16 @@ function remove_filter($tag, $function_to_remove, $priority = 10, $accepted_args
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* one or more of its PHP functions are executed at these points, using the
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* Action API.
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*
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* @uses add_filter() Adds an action. Parameter list and functionality are the same.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 1.5
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*
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* @param string $tag The name of the action to which the <tt>$function_to-add</tt> is hooked.
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* @param callback $function_to_add The name of the function you wish to be called. Note: any of the syntaxes explained in the PHP documentation for the 'callback' type (http://us2.php.net/manual/en/language.pseudo-types.php#language.types.callback) are valid.
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* @param callback $function_to_add The name of the function you wish to be called.
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* @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.
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* @param int $accepted_args optional. The number of arguments the function accept (default 1). 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.
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* @return boolean Always true.
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* @param int $accepted_args optional. The number of arguments the function accept (default 1).
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*/
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function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
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add_filter($tag, $function_to_add, $priority, $accepted_args);
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@ -133,9 +224,21 @@ function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1)
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* This function invokes all functions attached to action hook <tt>$tag</tt>.
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* It is possible to create new action hooks by simply calling this function,
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* specifying the name of the new hook using the <tt>$tag</tt> parameter.
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* @uses merge_filters
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*
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* You can pass extra arguments to the hooks, much like you can with apply_filters().
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*
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* @see apply_filters() This function works similar with the exception that nothing is
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* returned and only the functions or methods are called.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 1.5
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* @global array $wp_filter Stores all of the filters
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* @global array $wp_actions Increments the amount of times action was triggered.
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*
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* @param string $tag The name of the action to be executed.
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* @param mixed $arg,... Optional additional arguments which are passed on to the functions hooked to the action.
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* @return null Will return null if $tag does not exist in $wp_filter array
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*/
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function do_action($tag, $arg = '') {
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global $wp_filter, $wp_actions;
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@ -169,6 +272,12 @@ function do_action($tag, $arg = '') {
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/**
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* Return the number times an action is fired.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 2.1
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* @global array $wp_actions Increments the amount of times action was triggered.
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*
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* @param string $tag The name of the action hook.
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* @return int The number of times action hook <tt>$tag</tt> is fired
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*/
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@ -182,12 +291,22 @@ function did_action($tag) {
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}
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/**
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* Execute functions hooked on a specific action hook, specifying arguments in a array.
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* Execute functions hooked on a specific action hook, specifying arguments in an array.
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*
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* This function is identical to {@link do_action}, but the argumetns passe to
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* @see do_action() This function is identical, but the arguments passed to
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* the functions hooked to <tt>$tag</tt> are supplied using an array.
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*
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* @uses merge_filters()
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 2.1
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* @global array $wp_filter Stores all of the filters
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* @global array $wp_actions Increments the amount of times action was triggered.
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*
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* @param string $tag The name of the action to be executed.
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* @param array $args The arguments supplied to the functions hooked to <tt>$tag</tt>
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* @return null Will return null if $tag does not exist in $wp_filter array
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*/
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function do_action_ref_array($tag, $args) {
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global $wp_filter, $wp_actions;
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@ -217,6 +336,13 @@ function do_action_ref_array($tag, $args) {
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* This function removes a function attached to a specified action hook. This
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* method can be used to remove default functions attached to a specific filter
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* hook and possibly replace them with a substitute.
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*
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* @uses remove_filter() Uses remove_filter to remove actions added.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 1.5
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*
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* @param string $tag The action hook to which the function to be removed is hooked.
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* @param callback $function_to_remove The name of the function which should be removed.
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* @param int $priority optional The priority of the function (default: 10).
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@ -235,6 +361,13 @@ function remove_action($tag, $function_to_remove, $priority = 10, $accepted_args
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* Gets the basename of a plugin.
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*
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* This method extract the name of a plugin from its filename.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 1.5
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*
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* @access private
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*
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* @param string $file The filename of plugin.
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* @return string The name of a plugin.
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*/
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@ -252,10 +385,17 @@ function plugin_basename($file) {
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* activated. In the name of this hook, PLUGINNAME is replaced with the name of
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* the plugin, including the optional subdirectory. For example, when the plugin
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* is located in <tt>wp-content/plugin/sampleplugin/sample.php</tt>, then the
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* name of this hook will become 'activate_sampleplugin/sample.php'.
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* name of this hook will become 'activate_sampleplugin/sample.php'
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* When the plugin consists of only one file and is (as by default) located at
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* <tt>wp-content/plugin/sample.php</tt> the name of this hook will be
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* 'activate_sample.php'.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 1.5
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*
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* @access private
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*
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* @param string $file The filename of the plugin including the path.
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* @param string $function the function hooked to the 'activate_PLUGIN' action.
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*/
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@ -275,6 +415,13 @@ function register_activation_hook($file, $function) {
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* When the plugin consists of only one file and is (as by default) located at
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* <tt>wp-content/plugin/sample.php</tt> the name of this hook will be
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* 'activate_sample.php'.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 2.0
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*
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* @access private
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*
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* @param string $file The filename of the plugin including the path.
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* @param string $function the function hooked to the 'activate_PLUGIN' action.
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*/
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@ -284,27 +431,31 @@ function register_deactivation_hook($file, $function) {
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}
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/**
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* Build Unique ID for storage and retrieval
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*
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* The old way to serialize the callback caused issues and this function is the
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* solution. It works by checking for objects and creating an a new property in
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* the class to keep track of the object and new objects of the same class that
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* need to be added.
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*
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* It also allows for the removal of actions and filters for objects after they
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* change class properties. It is possible to include the property $wp_filter_id
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* in your class and set it to "null" or a number to bypass the workaround. However
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* this will prevent you from adding new classes and any new classes will overwrite
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* the previous hook by the same class.
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*
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* Functions and static method callbacks are just returned as strings and shouldn't
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* have any speed penalty.
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*
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* @package WordPress
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* @subpackage Plugin
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* @since 2.2.3
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*
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* @link http://trac.wordpress.org/ticket/3875
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*
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* @access private
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*
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* _wp_filter_build_unique_id() - Build Unique ID for storage and retrieval
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*
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* This function is used to fix the issue where serialized, when used with
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* classes that updated their properties, wouldn't be able to remove actions.
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*
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* How it works is that it first checks if the $function parameter is a string
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* and passes it through, untouched. Functions won't need to be changed, since
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* there can only be one declared.
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*
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* The second type that will be passed through untouched, is for static methods
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* in classes. They don't need to be changed since they are much like functions
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* in that you can only call one of them.
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*
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* The main purpose of this function is for classes, which can have more than
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* one declared and you want to add more than one hook for each one that is
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* declared, or want to change properties internal of the class that you declared
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* the hook.
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*
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* @global $wp_filter
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* @global array $wp_filter Storage for all of the filters and actions
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* @param string $tag Used in counting how many hooks were applied
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* @param string|array $function Used for creating unique id
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* @param int $priority Used in counting how many hooks were applied
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|
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@ -315,14 +466,13 @@ function _wp_filter_build_unique_id($tag, $function, $priority = 10)
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global $wp_filter;
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// If function then just skip all of the tests and not overwrite the following.
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// Static Calling
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if( is_string($function) )
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return $function;
|
||||
// Object Class Calling
|
||||
else if(is_object($function[0]) )
|
||||
{
|
||||
$obj_idx = get_class($function[0]).$function[1];
|
||||
if( is_null($function[0]->wp_filter_id) ) {
|
||||
if( is_null($function[0]->wp_filter_id) ) { // This should be instead of is_null() change to !isset() to fix notice
|
||||
$count = count((array)$wp_filter[$tag][$priority]);
|
||||
$function[0]->wp_filter_id = $count;
|
||||
$obj_idx .= $count;
|
||||
|
|
@ -331,6 +481,7 @@ function _wp_filter_build_unique_id($tag, $function, $priority = 10)
|
|||
$obj_idx .= $function[0]->wp_filter_id;
|
||||
return $obj_idx;
|
||||
}
|
||||
// Static Calling
|
||||
else if( is_string($function[0]) )
|
||||
return $function[0].$function[1];
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue