source: trunk/www.guidonia.net/wp/wp-includes/plugin.php@ 44

Last change on this file since 44 was 44, checked in by luciano, 14 years ago
File size: 24.1 KB
Line 
1<?php
2/**
3 * The plugin API is located in this file, which allows for creating actions
4 * and filters and hooking functions, and methods. The functions or methods will
5 * then be run when the action or filter is called.
6 *
7 * The API callback examples reference functions, but can be methods of classes.
8 * To hook methods, you'll need to pass an array one of two ways.
9 *
10 * Any of the syntaxes explained in the PHP documentation for the
11 * {@link http://us2.php.net/manual/en/language.pseudo-types.php#language.types.callback 'callback'}
12 * type are valid.
13 *
14 * Also see the {@link http://codex.wordpress.org/Plugin_API Plugin API} for
15 * more information and examples on how to use a lot of these functions.
16 *
17 * @package WordPress
18 * @subpackage Plugin
19 * @since 1.5
20 */
21
22/**
23 * Hooks a function or method to a specific filter action.
24 *
25 * Filters are the hooks that WordPress launches to modify text of various types
26 * before adding it to the database or sending it to the browser screen. Plugins
27 * can specify that one or more of its PHP functions is executed to
28 * modify specific types of text at these times, using the Filter API.
29 *
30 * To use the API, the following code should be used to bind a callback to the
31 * filter.
32 *
33 * <code>
34 * function example_hook($example) { echo $example; }
35 * add_filter('example_filter', 'example_hook');
36 * </code>
37 *
38 * In WordPress 1.5.1+, hooked functions can take extra arguments that are set
39 * when the matching do_action() or apply_filters() call is run. The
40 * $accepted_args allow for calling functions only when the number of args
41 * match. Hooked functions can take extra arguments that are set when the
42 * matching do_action() or apply_filters() call is run. For example, the action
43 * comment_id_not_found will pass any functions that hook onto it the ID of the
44 * requested comment.
45 *
46 * <strong>Note:</strong> the function will return true no matter if the
47 * function was hooked fails or not. There are no checks for whether the
48 * function exists beforehand and no checks to whether the <tt>$function_to_add
49 * is even a string. It is up to you to take care and this is done for
50 * optimization purposes, so everything is as quick as possible.
51 *
52 * @package WordPress
53 * @subpackage Plugin
54 * @since 0.71
55 * @global array $wp_filter Stores all of the filters added in the form of
56 * wp_filter['tag']['array of priorities']['array of functions serialized']['array of ['array (functions, accepted_args)']']
57 * @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.
58 *
59 * @param string $tag The name of the filter to hook the $function_to_add to.
60 * @param callback $function_to_add The name of the function to be called when the filter is applied.
61 * @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.
62 * @param int $accepted_args optional. The number of arguments the function accept (default 1).
63 * @return boolean true
64 */
65function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
66 global $wp_filter, $merged_filters;
67
68 $idx = _wp_filter_build_unique_id($tag, $function_to_add, $priority);
69 $wp_filter[$tag][$priority][$idx] = array('function' => $function_to_add, 'accepted_args' => $accepted_args);
70 unset( $merged_filters[ $tag ] );
71 return true;
72}
73
74/**
75 * Check if any filter has been registered for a hook.
76 *
77 * @package WordPress
78 * @subpackage Plugin
79 * @since 2.5
80 * @global array $wp_filter Stores all of the filters
81 *
82 * @param string $tag The name of the filter hook.
83 * @param callback $function_to_check optional. If specified, return the priority of that function on this hook or false if not attached.
84 * @return int|boolean Optionally returns the priority on that hook for the specified function.
85 */
86function has_filter($tag, $function_to_check = false) {
87 global $wp_filter;
88
89 $has = !empty($wp_filter[$tag]);
90 if ( false === $function_to_check || false == $has )
91 return $has;
92
93 if ( !$idx = _wp_filter_build_unique_id($tag, $function_to_check, false) )
94 return false;
95
96 foreach ( (array) array_keys($wp_filter[$tag]) as $priority ) {
97 if ( isset($wp_filter[$tag][$priority][$idx]) )
98 return $priority;
99 }
100
101 return false;
102}
103
104/**
105 * Call the functions added to a filter hook.
106 *
107 * The callback functions attached to filter hook $tag are invoked by calling
108 * this function. This function can be used to create a new filter hook by
109 * simply calling this function with the name of the new hook specified using
110 * the $tag parameter.
111 *
112 * The function allows for additional arguments to be added and passed to hooks.
113 * <code>
114 * function example_hook($string, $arg1, $arg2)
115 * {
116 * //Do stuff
117 * return $string;
118 * }
119 * $value = apply_filters('example_filter', 'filter me', 'arg1', 'arg2');
120 * </code>
121 *
122 * @package WordPress
123 * @subpackage Plugin
124 * @since 0.71
125 * @global array $wp_filter Stores all of the filters
126 * @global array $merged_filters Merges the filter hooks using this function.
127 * @global array $wp_current_filter stores the list of current filters with the current one last
128 *
129 * @param string $tag The name of the filter hook.
130 * @param mixed $value The value on which the filters hooked to <tt>$tag</tt> are applied on.
131 * @param mixed $var,... Additional variables passed to the functions hooked to <tt>$tag</tt>.
132 * @return mixed The filtered value after all hooked functions are applied to it.
133 */
134function apply_filters($tag, $value) {
135 global $wp_filter, $merged_filters, $wp_current_filter;
136
137 $args = array();
138 $wp_current_filter[] = $tag;
139
140 // Do 'all' actions first
141 if ( isset($wp_filter['all']) ) {
142 $args = func_get_args();
143 _wp_call_all_hook($args);
144 }
145
146 if ( !isset($wp_filter[$tag]) ) {
147 array_pop($wp_current_filter);
148 return $value;
149 }
150
151 // Sort
152 if ( !isset( $merged_filters[ $tag ] ) ) {
153 ksort($wp_filter[$tag]);
154 $merged_filters[ $tag ] = true;
155 }
156
157 reset( $wp_filter[ $tag ] );
158
159 if ( empty($args) )
160 $args = func_get_args();
161
162 do {
163 foreach( (array) current($wp_filter[$tag]) as $the_ )
164 if ( !is_null($the_['function']) ){
165 $args[1] = $value;
166 $value = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args']));
167 }
168
169 } while ( next($wp_filter[$tag]) !== false );
170
171 array_pop( $wp_current_filter );
172
173 return $value;
174}
175
176/**
177 * Removes a function from a specified filter hook.
178 *
179 * This function removes a function attached to a specified filter hook. This
180 * method can be used to remove default functions attached to a specific filter
181 * hook and possibly replace them with a substitute.
182 *
183 * To remove a hook, the $function_to_remove and $priority arguments must match
184 * when the hook was added. This goes for both filters and actions. No warning
185 * will be given on removal failure.
186 *
187 * @package WordPress
188 * @subpackage Plugin
189 * @since 1.2
190 *
191 * @param string $tag The filter hook to which the function to be removed is hooked.
192 * @param callback $function_to_remove The name of the function which should be removed.
193 * @param int $priority optional. The priority of the function (default: 10).
194 * @param int $accepted_args optional. The number of arguments the function accpets (default: 1).
195 * @return boolean Whether the function existed before it was removed.
196 */
197function remove_filter($tag, $function_to_remove, $priority = 10, $accepted_args = 1) {
198 $function_to_remove = _wp_filter_build_unique_id($tag, $function_to_remove, $priority);
199
200 $r = isset($GLOBALS['wp_filter'][$tag][$priority][$function_to_remove]);
201
202 if ( true === $r) {
203 unset($GLOBALS['wp_filter'][$tag][$priority][$function_to_remove]);
204 if ( empty($GLOBALS['wp_filter'][$tag][$priority]) )
205 unset($GLOBALS['wp_filter'][$tag][$priority]);
206 unset($GLOBALS['merged_filters'][$tag]);
207 }
208
209 return $r;
210}
211
212/**
213 * Remove all of the hooks from a filter.
214 *
215 * @since 2.7
216 *
217 * @param string $tag The filter to remove hooks from.
218 * @param int $priority The priority number to remove.
219 * @return bool True when finished.
220 */
221function remove_all_filters($tag, $priority = false) {
222 global $wp_filter, $merged_filters;
223
224 if( isset($wp_filter[$tag]) ) {
225 if( false !== $priority && isset($$wp_filter[$tag][$priority]) )
226 unset($wp_filter[$tag][$priority]);
227 else
228 unset($wp_filter[$tag]);
229 }
230
231 if( isset($merged_filters[$tag]) )
232 unset($merged_filters[$tag]);
233
234 return true;
235}
236
237/**
238 * Retrieve the name of the current filter or action.
239 *
240 * @package WordPress
241 * @subpackage Plugin
242 * @since 2.5
243 *
244 * @return string Hook name of the current filter or action.
245 */
246function current_filter() {
247 global $wp_current_filter;
248 return end( $wp_current_filter );
249}
250
251
252/**
253 * Hooks a function on to a specific action.
254 *
255 * Actions are the hooks that the WordPress core launches at specific points
256 * during execution, or when specific events occur. Plugins can specify that
257 * one or more of its PHP functions are executed at these points, using the
258 * Action API.
259 *
260 * @uses add_filter() Adds an action. Parameter list and functionality are the same.
261 *
262 * @package WordPress
263 * @subpackage Plugin
264 * @since 1.2
265 *
266 * @param string $tag The name of the action to which the $function_to_add is hooked.
267 * @param callback $function_to_add The name of the function you wish to be called.
268 * @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.
269 * @param int $accepted_args optional. The number of arguments the function accept (default 1).
270 */
271function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
272 return add_filter($tag, $function_to_add, $priority, $accepted_args);
273}
274
275
276/**
277 * Execute functions hooked on a specific action hook.
278 *
279 * This function invokes all functions attached to action hook $tag. It is
280 * possible to create new action hooks by simply calling this function,
281 * specifying the name of the new hook using the <tt>$tag</tt> parameter.
282 *
283 * You can pass extra arguments to the hooks, much like you can with
284 * apply_filters().
285 *
286 * @see apply_filters() This function works similar with the exception that
287 * nothing is returned and only the functions or methods are called.
288 *
289 * @package WordPress
290 * @subpackage Plugin
291 * @since 1.2
292 * @global array $wp_filter Stores all of the filters
293 * @global array $wp_actions Increments the amount of times action was triggered.
294 *
295 * @param string $tag The name of the action to be executed.
296 * @param mixed $arg,... Optional additional arguments which are passed on to the functions hooked to the action.
297 * @return null Will return null if $tag does not exist in $wp_filter array
298 */
299function do_action($tag, $arg = '') {
300 global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;
301
302 if ( is_array($wp_actions) )
303 $wp_actions[] = $tag;
304 else
305 $wp_actions = array($tag);
306
307 $wp_current_filter[] = $tag;
308
309 // Do 'all' actions first
310 if ( isset($wp_filter['all']) ) {
311 $all_args = func_get_args();
312 _wp_call_all_hook($all_args);
313 }
314
315 if ( !isset($wp_filter[$tag]) ) {
316 array_pop($wp_current_filter);
317 return;
318 }
319
320 $args = array();
321 if ( is_array($arg) && 1 == count($arg) && is_object($arg[0]) ) // array(&$this)
322 $args[] =& $arg[0];
323 else
324 $args[] = $arg;
325 for ( $a = 2; $a < func_num_args(); $a++ )
326 $args[] = func_get_arg($a);
327
328 // Sort
329 if ( !isset( $merged_filters[ $tag ] ) ) {
330 ksort($wp_filter[$tag]);
331 $merged_filters[ $tag ] = true;
332 }
333
334 reset( $wp_filter[ $tag ] );
335
336 do {
337 foreach ( (array) current($wp_filter[$tag]) as $the_ )
338 if ( !is_null($the_['function']) )
339 call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
340
341 } while ( next($wp_filter[$tag]) !== false );
342
343 array_pop($wp_current_filter);
344}
345
346/**
347 * Retrieve the number times an action is fired.
348 *
349 * @package WordPress
350 * @subpackage Plugin
351 * @since 2.1
352 * @global array $wp_actions Increments the amount of times action was triggered.
353 *
354 * @param string $tag The name of the action hook.
355 * @return int The number of times action hook <tt>$tag</tt> is fired
356 */
357function did_action($tag) {
358 global $wp_actions;
359
360 if ( empty($wp_actions) )
361 return 0;
362
363 return count(array_keys($wp_actions, $tag));
364}
365
366/**
367 * Execute functions hooked on a specific action hook, specifying arguments in an array.
368 *
369 * @see do_action() This function is identical, but the arguments passed to the
370 * functions hooked to <tt>$tag</tt> are supplied using an array.
371 *
372 * @package WordPress
373 * @subpackage Plugin
374 * @since 2.1
375 * @global array $wp_filter Stores all of the filters
376 * @global array $wp_actions Increments the amount of times action was triggered.
377 *
378 * @param string $tag The name of the action to be executed.
379 * @param array $args The arguments supplied to the functions hooked to <tt>$tag</tt>
380 * @return null Will return null if $tag does not exist in $wp_filter array
381 */
382function do_action_ref_array($tag, $args) {
383 global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;
384
385 if ( !is_array($wp_actions) )
386 $wp_actions = array($tag);
387 else
388 $wp_actions[] = $tag;
389
390 $wp_current_filter[] = $tag;
391
392 // Do 'all' actions first
393 if ( isset($wp_filter['all']) ) {
394 $all_args = func_get_args();
395 _wp_call_all_hook($all_args);
396 }
397
398 if ( !isset($wp_filter[$tag]) ) {
399 array_pop($wp_current_filter);
400 return;
401 }
402
403 // Sort
404 if ( !isset( $merged_filters[ $tag ] ) ) {
405 ksort($wp_filter[$tag]);
406 $merged_filters[ $tag ] = true;
407 }
408
409 reset( $wp_filter[ $tag ] );
410
411 do {
412 foreach( (array) current($wp_filter[$tag]) as $the_ )
413 if ( !is_null($the_['function']) )
414 call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
415
416 } while ( next($wp_filter[$tag]) !== false );
417
418 array_pop($wp_current_filter);
419}
420
421/**
422 * Check if any action has been registered for a hook.
423 *
424 * @package WordPress
425 * @subpackage Plugin
426 * @since 2.5
427 * @see has_filter() has_action() is an alias of has_filter().
428 *
429 * @param string $tag The name of the action hook.
430 * @param callback $function_to_check optional. If specified, return the priority of that function on this hook or false if not attached.
431 * @return int|boolean Optionally returns the priority on that hook for the specified function.
432 */
433function has_action($tag, $function_to_check = false) {
434 return has_filter($tag, $function_to_check);
435}
436
437/**
438 * Removes a function from a specified action hook.
439 *
440 * This function removes a function attached to a specified action hook. This
441 * method can be used to remove default functions attached to a specific filter
442 * hook and possibly replace them with a substitute.
443 *
444 * @package WordPress
445 * @subpackage Plugin
446 * @since 1.2
447 *
448 * @param string $tag The action hook to which the function to be removed is hooked.
449 * @param callback $function_to_remove The name of the function which should be removed.
450 * @param int $priority optional The priority of the function (default: 10).
451 * @param int $accepted_args optional. The number of arguments the function accpets (default: 1).
452 * @return boolean Whether the function is removed.
453 */
454function remove_action($tag, $function_to_remove, $priority = 10, $accepted_args = 1) {
455 return remove_filter($tag, $function_to_remove, $priority, $accepted_args);
456}
457
458/**
459 * Remove all of the hooks from an action.
460 *
461 * @since 2.7
462 *
463 * @param string $tag The action to remove hooks from.
464 * @param int $priority The priority number to remove them from.
465 * @return bool True when finished.
466 */
467function remove_all_actions($tag, $priority = false) {
468 return remove_all_filters($tag, $priority);
469}
470
471//
472// Functions for handling plugins.
473//
474
475/**
476 * Gets the basename of a plugin.
477 *
478 * This method extracts the name of a plugin from its filename.
479 *
480 * @package WordPress
481 * @subpackage Plugin
482 * @since 1.5
483 *
484 * @access private
485 *
486 * @param string $file The filename of plugin.
487 * @return string The name of a plugin.
488 * @uses WP_PLUGIN_DIR
489 */
490function plugin_basename($file) {
491 $file = str_replace('\\','/',$file); // sanitize for Win32 installs
492 $file = preg_replace('|/+|','/', $file); // remove any duplicate slash
493 $plugin_dir = str_replace('\\','/',WP_PLUGIN_DIR); // sanitize for Win32 installs
494 $plugin_dir = preg_replace('|/+|','/', $plugin_dir); // remove any duplicate slash
495 $mu_plugin_dir = str_replace('\\','/',WPMU_PLUGIN_DIR); // sanitize for Win32 installs
496 $mu_plugin_dir = preg_replace('|/+|','/', $mu_plugin_dir); // remove any duplicate slash
497 $file = preg_replace('#^' . preg_quote($plugin_dir, '#') . '/|^' . preg_quote($mu_plugin_dir, '#') . '/#','',$file); // get relative path from plugins dir
498 $file = trim($file, '/');
499 return $file;
500}
501
502/**
503 * Gets the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in
504 * @package WordPress
505 * @subpackage Plugin
506 * @since 2.8
507 *
508 * @param string $file The filename of the plugin (__FILE__)
509 * @return string the filesystem path of the directory that contains the plugin
510 */
511function plugin_dir_path( $file ) {
512 return trailingslashit( dirname( $file ) );
513}
514
515/**
516 * Gets the URL directory path (with trailing slash) for the plugin __FILE__ passed in
517 * @package WordPress
518 * @subpackage Plugin
519 * @since 2.8
520 *
521 * @param string $file The filename of the plugin (__FILE__)
522 * @return string the URL path of the directory that contains the plugin
523 */
524function plugin_dir_url( $file ) {
525 return trailingslashit( plugins_url( '', $file ) );
526}
527
528/**
529 * Set the activation hook for a plugin.
530 *
531 * When a plugin is activated, the action 'activate_PLUGINNAME' hook is
532 * activated. In the name of this hook, PLUGINNAME is replaced with the name of
533 * the plugin, including the optional subdirectory. For example, when the plugin
534 * is located in wp-content/plugin/sampleplugin/sample.php, then the name of
535 * this hook will become 'activate_sampleplugin/sample.php'. When the plugin
536 * consists of only one file and is (as by default) located at
537 * wp-content/plugin/sample.php the name of this hook will be
538 * 'activate_sample.php'.
539 *
540 * @package WordPress
541 * @subpackage Plugin
542 * @since 2.0
543 *
544 * @param string $file The filename of the plugin including the path.
545 * @param callback $function the function hooked to the 'activate_PLUGIN' action.
546 */
547function register_activation_hook($file, $function) {
548 $file = plugin_basename($file);
549 add_action('activate_' . $file, $function);
550}
551
552/**
553 * Set the deactivation hook for a plugin.
554 *
555 * When a plugin is deactivated, the action 'deactivate_PLUGINNAME' hook is
556 * deactivated. In the name of this hook, PLUGINNAME is replaced with the name
557 * of the plugin, including the optional subdirectory. For example, when the
558 * plugin is located in wp-content/plugin/sampleplugin/sample.php, then
559 * the name of this hook will become 'activate_sampleplugin/sample.php'.
560 *
561 * When the plugin consists of only one file and is (as by default) located at
562 * wp-content/plugin/sample.php the name of this hook will be
563 * 'activate_sample.php'.
564 *
565 * @package WordPress
566 * @subpackage Plugin
567 * @since 2.0
568 *
569 * @param string $file The filename of the plugin including the path.
570 * @param callback $function the function hooked to the 'activate_PLUGIN' action.
571 */
572function register_deactivation_hook($file, $function) {
573 $file = plugin_basename($file);
574 add_action('deactivate_' . $file, $function);
575}
576
577/**
578 * Set the uninstallation hook for a plugin.
579 *
580 * Registers the uninstall hook that will be called when the user clicks on the
581 * uninstall link that calls for the plugin to uninstall itself. The link won't
582 * be active unless the plugin hooks into the action.
583 *
584 * The plugin should not run arbitrary code outside of functions, when
585 * registering the uninstall hook. In order to run using the hook, the plugin
586 * will have to be included, which means that any code laying outside of a
587 * function will be run during the uninstall process. The plugin should not
588 * hinder the uninstall process.
589 *
590 * If the plugin can not be written without running code within the plugin, then
591 * the plugin should create a file named 'uninstall.php' in the base plugin
592 * folder. This file will be called, if it exists, during the uninstall process
593 * bypassing the uninstall hook. The plugin, when using the 'uninstall.php'
594 * should always check for the 'WP_UNINSTALL_PLUGIN' constant, before
595 * executing.
596 *
597 * @since 2.7
598 *
599 * @param string $file
600 * @param callback $callback The callback to run when the hook is called.
601 */
602function register_uninstall_hook($file, $callback) {
603 // The option should not be autoloaded, because it is not needed in most
604 // cases. Emphasis should be put on using the 'uninstall.php' way of
605 // uninstalling the plugin.
606 $uninstallable_plugins = (array) get_option('uninstall_plugins');
607 $uninstallable_plugins[plugin_basename($file)] = $callback;
608 update_option('uninstall_plugins', $uninstallable_plugins);
609}
610
611/**
612 * Calls the 'all' hook, which will process the functions hooked into it.
613 *
614 * The 'all' hook passes all of the arguments or parameters that were used for
615 * the hook, which this function was called for.
616 *
617 * This function is used internally for apply_filters(), do_action(), and
618 * do_action_ref_array() and is not meant to be used from outside those
619 * functions. This function does not check for the existence of the all hook, so
620 * it will fail unless the all hook exists prior to this function call.
621 *
622 * @package WordPress
623 * @subpackage Plugin
624 * @since 2.5
625 * @access private
626 *
627 * @uses $wp_filter Used to process all of the functions in the 'all' hook
628 *
629 * @param array $args The collected parameters from the hook that was called.
630 * @param string $hook Optional. The hook name that was used to call the 'all' hook.
631 */
632function _wp_call_all_hook($args) {
633 global $wp_filter;
634
635 reset( $wp_filter['all'] );
636 do {
637 foreach( (array) current($wp_filter['all']) as $the_ )
638 if ( !is_null($the_['function']) )
639 call_user_func_array($the_['function'], $args);
640
641 } while ( next($wp_filter['all']) !== false );
642}
643
644/**
645 * Build Unique ID for storage and retrieval.
646 *
647 * The old way to serialize the callback caused issues and this function is the
648 * solution. It works by checking for objects and creating an a new property in
649 * the class to keep track of the object and new objects of the same class that
650 * need to be added.
651 *
652 * It also allows for the removal of actions and filters for objects after they
653 * change class properties. It is possible to include the property $wp_filter_id
654 * in your class and set it to "null" or a number to bypass the workaround.
655 * However this will prevent you from adding new classes and any new classes
656 * will overwrite the previous hook by the same class.
657 *
658 * Functions and static method callbacks are just returned as strings and
659 * shouldn't have any speed penalty.
660 *
661 * @package WordPress
662 * @subpackage Plugin
663 * @access private
664 * @since 2.2.3
665 * @link http://trac.wordpress.org/ticket/3875
666 *
667 * @global array $wp_filter Storage for all of the filters and actions
668 * @param string $tag Used in counting how many hooks were applied
669 * @param callback $function Used for creating unique id
670 * @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.
671 * @param string $type filter or action
672 * @return string|bool Unique ID for usage as array key or false if $priority === false and $function is an object reference, and it does not already have a uniqe id.
673 */
674function _wp_filter_build_unique_id($tag, $function, $priority) {
675 global $wp_filter;
676 static $filter_id_count = 0;
677
678 // If function then just skip all of the tests and not overwrite the following.
679 if ( is_string($function) )
680 return $function;
681 // Object Class Calling
682 else if (is_object($function[0]) ) {
683 $obj_idx = get_class($function[0]).$function[1];
684 if ( !isset($function[0]->wp_filter_id) ) {
685 if ( false === $priority )
686 return false;
687 $obj_idx .= isset($wp_filter[$tag][$priority]) ? count((array)$wp_filter[$tag][$priority]) : 0;
688 $function[0]->wp_filter_id = $filter_id_count++;
689 } else
690 $obj_idx .= $function[0]->wp_filter_id;
691 return $obj_idx;
692 }
693 // Static Calling
694 else if ( is_string($function[0]) )
695 return $function[0].$function[1];
696}
697
698?>
Note: See TracBrowser for help on using the repository browser.