X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/4713a14935b83517997f3c88f808eb41da55033d..caeaf8dc94b5e3f75dc98ec92dc7b76049cdddb6:/wp-includes/plugin.php
diff --git a/wp-includes/plugin.php b/wp-includes/plugin.php
index 7eba1bbd..27a65ee1 100644
--- a/wp-includes/plugin.php
+++ b/wp-includes/plugin.php
@@ -35,7 +35,7 @@ if ( ! isset( $wp_current_filter ) )
$wp_current_filter = array();
/**
- * Hooks a function or method to a specific filter action.
+ * Hook a function or method to a specific filter action.
*
* WordPress offers filter hooks to allow plugins to modify
* various types of internal data at runtime.
@@ -45,35 +45,37 @@ if ( ! isset( $wp_current_filter ) )
* the opportunity to modify a value by returning a new value.
*
* The following example shows how a callback function is bound to a filter hook.
- * Note that $example is passed to the callback, (maybe) modified, then returned:
*
- *
- * function example_callback( $example ) {
- * // Maybe modify $example in some way
- * return $example;
- * }
- * add_filter( 'example_filter', 'example_callback' );
- *
+ * Note that `$example` is passed to the callback, (maybe) modified, then returned:
+ *
+ * function example_callback( $example ) {
+ * // Maybe modify $example in some way.
+ * return $example;
+ * }
+ * add_filter( 'example_filter', 'example_callback' );
*
* Since WordPress 1.5.1, bound callbacks can take as many arguments as are
- * passed as parameters in the corresponding apply_filters() call. The $accepted_args
+ * passed as parameters in the corresponding apply_filters() call. The `$accepted_args`
* parameter allows for calling functions only when the number of args match.
*
- * Note: the function will return true whether or not the callback
- * is valid. It is up to you to take care. This is done for optimization purposes,
+ * *Note:* the function will return true whether or not the callback is valid.
+ * It is up to you to take care. This is done for optimization purposes,
* so everything is as quick as possible.
*
- * @global array $wp_filter A multidimensional array of all hooks and the callbacks hooked to them.
- * @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.
- *
* @since 0.71
*
+ * @global array $wp_filter A multidimensional array of all hooks and the callbacks hooked to them.
+ * @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 callback to.
* @param callback $function_to_add The callback to be run when the filter is applied.
- * @param int $priority (optional) The order in which the functions associated with a particular action are executed. 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.
- * Default 10.
- * @param int $accepted_args (optional) The number of arguments the function accepts.
- * Default 1.
+ * @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 accepts. Default 1.
* @return boolean true
*/
function add_filter( $tag, $function_to_add, $priority = 10, $accepted_args = 1 ) {
@@ -90,19 +92,38 @@ function add_filter( $tag, $function_to_add, $priority = 10, $accepted_args = 1
*
* @since 2.5.0
*
- * @global array $wp_filter Stores all of the filters
+ * @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.
+ * @param string $tag The name of the filter hook.
+ * @param callback|bool $function_to_check Optional. The callback to check for. Default false.
+ * @return bool|int 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;
+ // Don't reset the internal array pointer
+ $wp_filter = $GLOBALS['wp_filter'];
+
+ $has = ! empty( $wp_filter[ $tag ] );
+
+ // Make sure at least one priority has a filter callback
+ if ( $has ) {
+ $exists = false;
+ foreach ( $wp_filter[ $tag ] as $callbacks ) {
+ if ( ! empty( $callbacks ) ) {
+ $exists = true;
+ break;
+ }
+ }
+
+ if ( ! $exists ) {
+ $has = false;
+ }
+ }
- $has = !empty($wp_filter[$tag]);
if ( false === $function_to_check || false == $has )
return $has;
@@ -126,31 +147,31 @@ function has_filter($tag, $function_to_check = false) {
* the $tag parameter.
*
* The function allows for additional arguments to be added and passed to hooks.
- *
- * // Our filter callback function
- * function example_callback( $string, $arg1, $arg2 ) {
- * // (maybe) modify $string
- * return $string;
- * }
- * add_filter( 'example_filter', 'example_callback', 10, 3 );
- *
- * // Apply the filters by calling the 'example_callback' function we
- * // "hooked" to 'example_filter' using the add_filter() function above.
- * // - 'example_filter' is the filter hook $tag
- * // - 'filter me' is the value being filtered
- * // - $arg1 and $arg2 are the additional arguments passed to the callback.
- * $value = apply_filters( 'example_filter', 'filter me', $arg1, $arg2 );
- *
*
- * @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
+ * // Our filter callback function
+ * function example_callback( $string, $arg1, $arg2 ) {
+ * // (maybe) modify $string
+ * return $string;
+ * }
+ * add_filter( 'example_filter', 'example_callback', 10, 3 );
+ *
+ * /*
+ * * Apply the filters by calling the 'example_callback' function we
+ * * "hooked" to 'example_filter' using the add_filter() function above.
+ * * - 'example_filter' is the filter hook $tag
+ * * - 'filter me' is the value being filtered
+ * * - $arg1 and $arg2 are the additional arguments passed to the callback.
+ * $value = apply_filters( 'example_filter', 'filter me', $arg1, $arg2 );
*
* @since 0.71
*
- * @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.
+ * @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 ) {
@@ -158,7 +179,7 @@ function apply_filters( $tag, $value ) {
$args = array();
- // Do 'all' actions first
+ // Do 'all' actions first.
if ( isset($wp_filter['all']) ) {
$wp_current_filter[] = $tag;
$args = func_get_args();
@@ -174,7 +195,7 @@ function apply_filters( $tag, $value ) {
if ( !isset($wp_filter['all']) )
$wp_current_filter[] = $tag;
- // Sort
+ // Sort.
if ( !isset( $merged_filters[ $tag ] ) ) {
ksort($wp_filter[$tag]);
$merged_filters[ $tag ] = true;
@@ -202,16 +223,17 @@ function apply_filters( $tag, $value ) {
/**
* Execute functions hooked on a specific filter hook, specifying arguments in an array.
*
+ * @see 3.0.0
+ *
* @see apply_filters() This function is identical, but the arguments passed to the
- * functions hooked to $tag are supplied using an array.
+ * functions hooked to `$tag` are supplied using an array.
*
- * @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
+ * @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
+ * @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, $args) {
@@ -266,22 +288,25 @@ function apply_filters_ref_array($tag, $args) {
*
* @since 1.2.0
*
- * @param string $tag The filter hook to which the function to be removed is hooked.
+ * @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).
+ * @param int $priority Optional. The priority of the function. Default 10.
* @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);
+ $function_to_remove = _wp_filter_build_unique_id( $tag, $function_to_remove, $priority );
- $r = isset($GLOBALS['wp_filter'][$tag][$priority][$function_to_remove]);
+ $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]);
+ 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 ] );
+ }
+ if ( empty( $GLOBALS['wp_filter'][ $tag ] ) ) {
+ $GLOBALS['wp_filter'][ $tag ] = array();
+ }
+ unset( $GLOBALS['merged_filters'][ $tag ] );
}
return $r;
@@ -292,22 +317,24 @@ function remove_filter( $tag, $function_to_remove, $priority = 10 ) {
*
* @since 2.7.0
*
- * @param string $tag The filter to remove hooks from.
- * @param int $priority The priority number to remove.
+ * @param string $tag The filter to remove hooks from.
+ * @param int|bool $priority Optional. The priority number to remove. Default false.
* @return bool True when finished.
*/
-function remove_all_filters($tag, $priority = false) {
+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( $wp_filter[ $tag ]) ) {
+ if ( false !== $priority && isset( $wp_filter[ $tag ][ $priority ] ) ) {
+ $wp_filter[ $tag ][ $priority ] = array();
+ } else {
+ $wp_filter[ $tag ] = array();
+ }
}
- if( isset($merged_filters[$tag]) )
- unset($merged_filters[$tag]);
+ if ( isset( $merged_filters[ $tag ] ) ) {
+ unset( $merged_filters[ $tag ] );
+ }
return true;
}
@@ -329,8 +356,6 @@ function current_filter() {
*
* @since 3.9.0
*
- * @uses current_filter()
- *
* @return string Hook name of the current action.
*/
function current_action() {
@@ -342,7 +367,9 @@ function current_action() {
*
* The function current_filter() only returns the most recent filter or action
* being executed. did_action() returns true once the action is initially
- * processed. This function allows detection for any filter currently being
+ * processed.
+ *
+ * This function allows detection for any filter currently being
* executed (despite not being the most recent filter to fire, in the case of
* hooks called from hook callbacks) to be verified.
*
@@ -354,7 +381,7 @@ function current_action() {
*
* @param null|string $filter Optional. Filter to check. Defaults to null, which
* checks if any filter is currently being run.
- * @return bool Whether the filter is currently in the stack
+ * @return bool Whether the filter is currently in the stack.
*/
function doing_filter( $filter = null ) {
global $wp_current_filter;
@@ -371,8 +398,6 @@ function doing_filter( $filter = null ) {
*
* @since 3.9.0
*
- * @uses doing_filter()
- *
* @param string|null $action Optional. Action to check. Defaults to null, which checks
* if any action is currently being run.
* @return bool Whether the action is currently in the stack.
@@ -389,14 +414,17 @@ function doing_action( $action = null ) {
* 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.
- *
* @since 1.2.0
*
- * @param string $tag The name of the action to which the $function_to_add is hooked.
+ * @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).
+ * @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 $accepted_args Optional. The number of arguments the function accept. Default 1.
+ * @return bool Will always return true.
*/
function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
return add_filter($tag, $function_to_add, $priority, $accepted_args);
@@ -405,24 +433,22 @@ function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1)
/**
* Execute functions hooked on a specific action hook.
*
- * This function invokes all functions attached to action hook $tag. It is
+ * This function invokes all functions attached to action hook `$tag`. It is
* possible to create new action hooks by simply calling this function,
- * specifying the name of the new hook using the $tag parameter.
+ * specifying the name of the new hook using the `$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.
+ * {@see apply_filters()}.
*
* @since 1.2.0
*
- * @global array $wp_filter Stores all of the filters
+ * @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
+ * @param mixed $arg Optional. Additional arguments which are passed on to the
+ * functions hooked to the action. Default empty.
+ * @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, $wp_current_filter;
@@ -482,7 +508,7 @@ function do_action($tag, $arg = '') {
* @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
+ * @return int The number of times action hook $tag is fired.
*/
function did_action($tag) {
global $wp_actions;
@@ -496,17 +522,16 @@ function did_action($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.
- *
* @since 2.1.0
*
- * @global array $wp_filter Stores all of the filters
+ * @see do_action() This function is identical, but the arguments passed to the
+ * functions hooked to $tag< are supplied using an array.
+ * @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
+ * @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, $wp_current_filter;
@@ -557,12 +582,14 @@ function do_action_ref_array($tag, $args) {
*
* @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.
+ * @param string $tag The name of the action hook.
+ * @param callback|bool $function_to_check Optional. The callback to check for. Default false.
+ * @return bool|int 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, $function_to_check);
@@ -577,9 +604,9 @@ function has_action($tag, $function_to_check = false) {
*
* @since 1.2.0
*
- * @param string $tag The action hook to which the function to be removed is hooked.
+ * @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 $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 ) {
@@ -591,8 +618,8 @@ function remove_action( $tag, $function_to_remove, $priority = 10 ) {
*
* @since 2.7.0
*
- * @param string $tag The action to remove hooks from.
- * @param int $priority The priority number to remove them from.
+ * @param string $tag The action to remove hooks from.
+ * @param int|bool $priority The priority number to remove them from. Default false.
* @return bool True when finished.
*/
function remove_all_actions($tag, $priority = false) {
@@ -610,11 +637,8 @@ function remove_all_actions($tag, $priority = false) {
*
* @since 1.5.0
*
- * @access private
- *
* @param string $file The filename of plugin.
* @return string The name of a plugin.
- * @uses WP_PLUGIN_DIR
*/
function plugin_basename( $file ) {
global $wp_plugin_paths;
@@ -671,24 +695,24 @@ function wp_register_plugin_realpath( $file ) {
}
/**
- * Gets the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in
+ * Get the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in.
*
* @since 2.8.0
*
- * @param string $file The filename of the plugin (__FILE__)
- * @return string the filesystem path of the directory that contains the plugin
+ * @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
+ * Get the URL directory path (with trailing slash) for the plugin __FILE__ passed in.
*
* @since 2.8.0
*
- * @param string $file The filename of the plugin (__FILE__)
- * @return string the URL path of the directory that contains the plugin
+ * @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 ) );
@@ -709,8 +733,8 @@ function plugin_dir_url( $file ) {
*
* @since 2.0.0
*
- * @param string $file The filename of the plugin including the path.
- * @param callback $function the function hooked to the 'activate_PLUGIN' action.
+ * @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);
@@ -732,8 +756,8 @@ function register_activation_hook($file, $function) {
*
* @since 2.0.0
*
- * @param string $file The filename of the plugin including the path.
- * @param callback $function the function hooked to the 'deactivate_PLUGIN' action.
+ * @param string $file The filename of the plugin including the path.
+ * @param callback $function The function hooked to the 'deactivate_PLUGIN' action.
*/
function register_deactivation_hook($file, $function) {
$file = plugin_basename($file);
@@ -762,8 +786,9 @@ function register_deactivation_hook($file, $function) {
*
* @since 2.7.0
*
- * @param string $file
- * @param callback $callback The callback to run when the hook is called. Must be a static method or function.
+ * @param string $file Plugin 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] ) ) {
@@ -771,16 +796,19 @@ function register_uninstall_hook( $file, $callback ) {
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.
+ /*
+ * 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.
+ * Call 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.
@@ -793,8 +821,6 @@ function register_uninstall_hook( $file, $callback ) {
* @since 2.5.0
* @access private
*
- * @uses $wp_filter Used to process all of the functions in the 'all' hook
- *
* @param array $args The collected parameters from the hook that was called.
*/
function _wp_call_all_hook($args) {
@@ -826,15 +852,21 @@ function _wp_call_all_hook($args) {
* Functions and static method callbacks are just returned as strings and
* shouldn't have any speed penalty.
*
- * @access private
+ * @link https://core.trac.wordpress.org/ticket/3875
+ *
* @since 2.2.3
- * @link http://trac.wordpress.org/ticket/3875
+ * @access private
+ *
+ * @global array $wp_filter Storage for all of the filters and actions.
*
- * @global array $wp_filter Storage for all of the filters and actions
- * @param string $tag Used in counting how many hooks were applied
+ * @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.
+ * @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;