271 lines
11 KiB
PHP
271 lines
11 KiB
PHP
<?php
|
|
|
|
/**
|
|
* Hooks a function 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.
|
|
* See the [Plugin API] for a list of filter hooks.
|
|
*
|
|
* @param string $tag The name of the filter to hook the <tt>$function_to_add</tt> 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 $accepted_args optional. The number of arguments the function accept (default 1). In WordPress 1.5.1+, hooked functions can take extra arguments that are set when the matching do_action() or apply_filters() call is run.
|
|
* @return boolean true if the <tt>$function_to_add</tt> is added succesfully to filter <tt>$tag</tt>. How many arguments your function takes. In WordPress 1.5.1+, hooked functions can take extra arguments that are set when the matching <tt>do_action()</tt> or <tt>apply_filters()</tt> call is run. For example, the action <tt>comment_id_not_found</tt> will pass any functions that hook onto it the ID of the requested comment.
|
|
*/
|
|
function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
|
|
global $wp_filter;
|
|
|
|
// So the format is wp_filter['tag']['array of priorities']['array of functions serialized']['array of ['array (functions, accepted_args)]']
|
|
$wp_filter[$tag][$priority][serialize($function_to_add)] = array('function' => $function_to_add, 'accepted_args' => $accepted_args);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Call the functions added to a filter hook.
|
|
*
|
|
* The callback functions attached to filter hook <tt>$tag</tt> 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 <tt>$tag</a> parameter.
|
|
* @uses merge_filters Merges the filter hooks using this function.
|
|
* @param string $tag The name of the filter hook.
|
|
* @param string $string The text on which the filters hooked to <tt>$tag</tt> are applied on.
|
|
* @param mixed $var,... Additional variables passed to the functions hooked to <tt>$tag</tt>.
|
|
* @return string The text in <tt>$string</tt> after all hooked functions are applied to it.
|
|
*/
|
|
function apply_filters($tag, $string) {
|
|
global $wp_filter;
|
|
|
|
merge_filters($tag);
|
|
|
|
if ( !isset($wp_filter[$tag]) )
|
|
return $string;
|
|
|
|
$args = func_get_args();
|
|
|
|
do{
|
|
foreach( (array) current($wp_filter[$tag]) as $the_ )
|
|
if ( !is_null($the_['function']) ){
|
|
$args[1] = $string;
|
|
$string = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args']));
|
|
}
|
|
|
|
} while ( next($wp_filter[$tag]) );
|
|
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Merge the filter functions of a specific filter hook with generic filter functions.
|
|
*
|
|
* It is possible to defined generic filter functions using the filter hook
|
|
* <em>all</e>. These functions are called for every filter tag. This function
|
|
* merges the functions attached to the <em>all</em> hook with the functions
|
|
* of a specific hoook defined by <tt>$tag</tt>.
|
|
* @param string $tag The filter hook of which the functions should be merged.
|
|
*/
|
|
function merge_filters($tag) {
|
|
global $wp_filter;
|
|
|
|
if ( isset($wp_filter['all']) )
|
|
$wp_filter[$tag] = array_merge($wp_filter['all'], (array) $wp_filter[$tag]);
|
|
|
|
if ( isset($wp_filter[$tag]) ){
|
|
reset($wp_filter[$tag]);
|
|
uksort($wp_filter[$tag], "strnatcasecmp");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
* @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 $accepted_args optional. The number of arguments the function accpets (default: 1).
|
|
* @return boolean Whether the function is removed.
|
|
*/
|
|
function remove_filter($tag, $function_to_remove, $priority = 10, $accepted_args = 1) {
|
|
global $wp_filter;
|
|
|
|
unset($GLOBALS['wp_filter'][$tag][$priority][serialize($function_to_remove)]);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* @param string $tag The name of the action to which the <tt>$function_to-add</tt> is hooked.
|
|
* @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.
|
|
* @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 $accepted_args optional. The number of arguments the function accept (default 1). In WordPress 1.5.1+, hooked functions can take extra arguments that are set when the matching do_action() or apply_filters() call is run.
|
|
* @return boolean Always true.
|
|
*/
|
|
function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
|
|
add_filter($tag, $function_to_add, $priority, $accepted_args);
|
|
}
|
|
|
|
/**
|
|
* Execute functions hooked on a specific action hook.
|
|
*
|
|
* This function invokes all functions attached to action hook <tt>$tag</tt>.
|
|
* It is possible to create new action hooks by simply calling this function,
|
|
* specifying the name of the new hook using the <tt>$tag</tt> parameter.
|
|
* @uses merge_filters
|
|
* @param string $tag The name of the action to be executed.
|
|
* @param mixed $arg,... Optional additional arguments which are passed on to the functions hooked to the action.
|
|
*/
|
|
function do_action($tag, $arg = '') {
|
|
global $wp_filter, $wp_actions;
|
|
|
|
$args = array();
|
|
if ( is_array($arg) && 1 == count($arg) && is_object($arg[0]) ) // array(&$this)
|
|
$args[] =& $arg[0];
|
|
else
|
|
$args[] = $arg;
|
|
for ( $a = 2; $a < func_num_args(); $a++ )
|
|
$args[] = func_get_arg($a);
|
|
|
|
merge_filters($tag);
|
|
|
|
if ( !isset($wp_filter[$tag]) )
|
|
return;
|
|
|
|
do{
|
|
foreach( (array) current($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[$tag]) );
|
|
|
|
if ( is_array($wp_actions) )
|
|
$wp_actions[] = $tag;
|
|
else
|
|
$wp_actions = array($tag);
|
|
}
|
|
|
|
/**
|
|
* Return the number of functions hooked to a specific action hook.
|
|
* @param string $tag The name of the action hook.
|
|
* @return int The number of functions hooked to action hook <tt>$tag</tt>
|
|
*/
|
|
function did_action($tag) {
|
|
global $wp_actions;
|
|
|
|
return count(array_keys($wp_actions, $tag));
|
|
}
|
|
|
|
/**
|
|
* Execute functions hooked on a specific action hook, specifying arguments in a array.
|
|
*
|
|
* This function is identical to {@link do_action}, but the argumetns passe to
|
|
* the functions hooked to <tt>$tag</tt> are supplied using an array.
|
|
* @param string $tag The name of the action to be executed.
|
|
* @param array $args The arguments supplied to the functions hooked to <tt>$tag</tt>
|
|
*/
|
|
function do_action_ref_array($tag, $args) {
|
|
global $wp_filter, $wp_actions;
|
|
|
|
if ( !is_array($wp_actions) )
|
|
$wp_actions = array($tag);
|
|
else
|
|
$wp_actions[] = $tag;
|
|
|
|
merge_filters($tag);
|
|
|
|
if ( !isset($wp_filter[$tag]) )
|
|
return;
|
|
|
|
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]) );
|
|
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
* @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).
|
|
* @param int $accepted_args optional. The number of arguments the function accpets (default: 1).
|
|
* @return boolean Whether the function is removed.
|
|
*/
|
|
function remove_action($tag, $function_to_remove, $priority = 10, $accepted_args = 1) {
|
|
remove_filter($tag, $function_to_remove, $priority, $accepted_args);
|
|
}
|
|
|
|
//
|
|
// Functions for handling plugins.
|
|
//
|
|
|
|
/**
|
|
* Gets the basename of a plugin.
|
|
*
|
|
* This method extract the name of a plugin from its filename.
|
|
* @param string $file The filename of plugin.
|
|
* @return string The name of a plugin.
|
|
*/
|
|
function plugin_basename($file) {
|
|
$file = preg_replace('|\\\\+|', '\\\\', $file);
|
|
$file = preg_replace('/^.*wp-content[\\\\\/]plugins[\\\\\/]/', '', $file);
|
|
return $file;
|
|
}
|
|
|
|
/**
|
|
* Hook a function on a plugin activation action hook.
|
|
*
|
|
* 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 <tt>wp-content/plugin/sampleplugin/sample.php</tt>, 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
|
|
* <tt>wp-content/plugin/sample.php</tt> the name of this hook will be
|
|
* 'activate_sample.php'.
|
|
* @param string $file The filename of the plugin including the path.
|
|
* @param string $function the function hooked to the 'activate_PLUGIN' action.
|
|
*/
|
|
function register_activation_hook($file, $function) {
|
|
$file = plugin_basename($file);
|
|
add_action('activate_' . $file, $function);
|
|
}
|
|
|
|
/**
|
|
* Hook a function on a plugin deactivation action hook.
|
|
*
|
|
* 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 <tt>wp-content/plugin/sampleplugin/sample.php</tt>, 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
|
|
* <tt>wp-content/plugin/sample.php</tt> the name of this hook will be
|
|
* 'activate_sample.php'.
|
|
* @param string $file The filename of the plugin including the path.
|
|
* @param string $function the function hooked to the 'activate_PLUGIN' action.
|
|
*/
|
|
function register_deactivation_hook($file, $function) {
|
|
$file = plugin_basename($file);
|
|
add_action('deactivate_' . $file, $function);
|
|
}
|
|
|
|
?>
|