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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 https://www.php.net/manual/en/language.pseudo-types.php#language.types.callback 'callback'} 12 * type are valid. 13 * 14 * Also see the {@link https://developer.wordpress.org/plugins/ Plugin API} for 15 * more information and examples on how to use a lot of these functions. 16 * 17 * This file should have no external dependencies. 18 * 19 * @package WordPress 20 * @subpackage Plugin 21 * @since 1.5.0 22 */ 23 24 // Initialize the filter globals. 25 require __DIR__ . '/class-wp-hook.php'; 26 27 /** @var WP_Hook[] $wp_filter */ 28 global $wp_filter; 29 30 /** @var int[] $wp_actions */ 31 global $wp_actions; 32 33 /** @var string[] $wp_current_filter */ 34 global $wp_current_filter; 35 36 if ( $wp_filter ) { 37 $wp_filter = WP_Hook::build_preinitialized_hooks( $wp_filter ); 38 } else { 39 $wp_filter = array(); 40 } 41 42 if ( ! isset( $wp_actions ) ) { 43 $wp_actions = array(); 44 } 45 46 if ( ! isset( $wp_current_filter ) ) { 47 $wp_current_filter = array(); 48 } 49 50 /** 51 * Adds a callback function to a filter hook. 52 * 53 * WordPress offers filter hooks to allow plugins to modify 54 * various types of internal data at runtime. 55 * 56 * A plugin can modify data by binding a callback to a filter hook. When the filter 57 * is later applied, each bound callback is run in order of priority, and given 58 * the opportunity to modify a value by returning a new value. 59 * 60 * The following example shows how a callback function is bound to a filter hook. 61 * 62 * Note that `$example` is passed to the callback, (maybe) modified, then returned: 63 * 64 * function example_callback( $example ) { 65 * // Maybe modify $example in some way. 66 * return $example; 67 * } 68 * add_filter( 'example_filter', 'example_callback' ); 69 * 70 * Bound callbacks can accept from none to the total number of arguments passed as parameters 71 * in the corresponding apply_filters() call. 72 * 73 * In other words, if an apply_filters() call passes four total arguments, callbacks bound to 74 * it can accept none (the same as 1) of the arguments or up to four. The important part is that 75 * the `$accepted_args` value must reflect the number of arguments the bound callback *actually* 76 * opted to accept. If no arguments were accepted by the callback that is considered to be the 77 * same as accepting 1 argument. For example: 78 * 79 * // Filter call. 80 * $value = apply_filters( 'hook', $value, $arg2, $arg3 ); 81 * 82 * // Accepting zero/one arguments. 83 * function example_callback() { 84 * ... 85 * return 'some value'; 86 * } 87 * add_filter( 'hook', 'example_callback' ); // Where $priority is default 10, $accepted_args is default 1. 88 * 89 * // Accepting two arguments (three possible). 90 * function example_callback( $value, $arg2 ) { 91 * ... 92 * return $maybe_modified_value; 93 * } 94 * add_filter( 'hook', 'example_callback', 10, 2 ); // Where $priority is 10, $accepted_args is 2. 95 * 96 * *Note:* The function will return true whether or not the callback is valid. 97 * It is up to you to take care. This is done for optimization purposes, so 98 * everything is as quick as possible. 99 * 100 * @since 0.71 101 * 102 * @global WP_Hook[] $wp_filter A multidimensional array of all hooks and the callbacks hooked to them. 103 * 104 * @param string $hook_name The name of the filter to add the callback to. 105 * @param callable $callback The callback to be run when the filter is applied. 106 * @param int $priority Optional. Used to specify the order in which the functions 107 * associated with a particular filter are executed. 108 * Lower numbers correspond with earlier execution, 109 * and functions with the same priority are executed 110 * in the order in which they were added to the filter. Default 10. 111 * @param int $accepted_args Optional. The number of arguments the function accepts. Default 1. 112 * @return true Always returns true. 113 */ 114 function add_filter( $hook_name, $callback, $priority = 10, $accepted_args = 1 ) { 115 global $wp_filter; 116 117 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 118 $wp_filter[ $hook_name ] = new WP_Hook(); 119 } 120 121 $wp_filter[ $hook_name ]->add_filter( $hook_name, $callback, $priority, $accepted_args ); 122 123 return true; 124 } 125 126 /** 127 * Calls the callback functions that have been added to a filter hook. 128 * 129 * This function invokes all functions attached to filter hook `$hook_name`. 130 * It is possible to create new filter hooks by simply calling this function, 131 * specifying the name of the new hook using the `$hook_name` parameter. 132 * 133 * The function also allows for multiple additional arguments to be passed to hooks. 134 * 135 * Example usage: 136 * 137 * // The filter callback function. 138 * function example_callback( $string, $arg1, $arg2 ) { 139 * // (maybe) modify $string. 140 * return $string; 141 * } 142 * add_filter( 'example_filter', 'example_callback', 10, 3 ); 143 * 144 * /* 145 * * Apply the filters by calling the 'example_callback()' function 146 * * that's hooked onto `example_filter` above. 147 * * 148 * * - 'example_filter' is the filter hook. 149 * * - 'filter me' is the value being filtered. 150 * * - $arg1 and $arg2 are the additional arguments passed to the callback. 151 * $value = apply_filters( 'example_filter', 'filter me', $arg1, $arg2 ); 152 * 153 * @since 0.71 154 * @since 6.0.0 Formalized the existing and already documented `...$args` parameter 155 * by adding it to the function signature. 156 * 157 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 158 * @global string[] $wp_current_filter Stores the list of current filters with the current one last. 159 * 160 * @param string $hook_name The name of the filter hook. 161 * @param mixed $value The value to filter. 162 * @param mixed ...$args Additional parameters to pass to the callback functions. 163 * @return mixed The filtered value after all hooked functions are applied to it. 164 */ 165 function apply_filters( $hook_name, $value, ...$args ) { 166 global $wp_filter, $wp_current_filter; 167 168 // Do 'all' actions first. 169 if ( isset( $wp_filter['all'] ) ) { 170 $wp_current_filter[] = $hook_name; 171 172 $all_args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection 173 _wp_call_all_hook( $all_args ); 174 } 175 176 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 177 if ( isset( $wp_filter['all'] ) ) { 178 array_pop( $wp_current_filter ); 179 } 180 181 return $value; 182 } 183 184 if ( ! isset( $wp_filter['all'] ) ) { 185 $wp_current_filter[] = $hook_name; 186 } 187 188 // Pass the value to WP_Hook. 189 array_unshift( $args, $value ); 190 191 $filtered = $wp_filter[ $hook_name ]->apply_filters( $value, $args ); 192 193 array_pop( $wp_current_filter ); 194 195 return $filtered; 196 } 197 198 /** 199 * Calls the callback functions that have been added to a filter hook, specifying arguments in an array. 200 * 201 * @since 3.0.0 202 * 203 * @see apply_filters() This function is identical, but the arguments passed to the 204 * functions hooked to `$hook_name` are supplied using an array. 205 * 206 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 207 * @global string[] $wp_current_filter Stores the list of current filters with the current one last. 208 * 209 * @param string $hook_name The name of the filter hook. 210 * @param array $args The arguments supplied to the functions hooked to `$hook_name`. 211 * @return mixed The filtered value after all hooked functions are applied to it. 212 */ 213 function apply_filters_ref_array( $hook_name, $args ) { 214 global $wp_filter, $wp_current_filter; 215 216 // Do 'all' actions first. 217 if ( isset( $wp_filter['all'] ) ) { 218 $wp_current_filter[] = $hook_name; 219 $all_args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection 220 _wp_call_all_hook( $all_args ); 221 } 222 223 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 224 if ( isset( $wp_filter['all'] ) ) { 225 array_pop( $wp_current_filter ); 226 } 227 228 return $args[0]; 229 } 230 231 if ( ! isset( $wp_filter['all'] ) ) { 232 $wp_current_filter[] = $hook_name; 233 } 234 235 $filtered = $wp_filter[ $hook_name ]->apply_filters( $args[0], $args ); 236 237 array_pop( $wp_current_filter ); 238 239 return $filtered; 240 } 241 242 /** 243 * Checks if any filter has been registered for a hook. 244 * 245 * When using the `$callback` argument, this function may return a non-boolean value 246 * that evaluates to false (e.g. 0), so use the `===` operator for testing the return value. 247 * 248 * @since 2.5.0 249 * 250 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 251 * 252 * @param string $hook_name The name of the filter hook. 253 * @param callable|string|array|false $callback Optional. The callback to check for. 254 * This function can be called unconditionally to speculatively check 255 * a callback that may or may not exist. Default false. 256 * @return bool|int If `$callback` is omitted, returns boolean for whether the hook has 257 * anything registered. When checking a specific function, the priority 258 * of that hook is returned, or false if the function is not attached. 259 */ 260 function has_filter( $hook_name, $callback = false ) { 261 global $wp_filter; 262 263 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 264 return false; 265 } 266 267 return $wp_filter[ $hook_name ]->has_filter( $hook_name, $callback ); 268 } 269 270 /** 271 * Removes a callback function from a filter hook. 272 * 273 * This can be used to remove default functions attached to a specific filter 274 * hook and possibly replace them with a substitute. 275 * 276 * To remove a hook, the `$callback` and `$priority` arguments must match 277 * when the hook was added. This goes for both filters and actions. No warning 278 * will be given on removal failure. 279 * 280 * @since 1.2.0 281 * 282 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 283 * 284 * @param string $hook_name The filter hook to which the function to be removed is hooked. 285 * @param callable|string|array $callback The callback to be removed from running when the filter is applied. 286 * This function can be called unconditionally to speculatively remove 287 * a callback that may or may not exist. 288 * @param int $priority Optional. The exact priority used when adding the original 289 * filter callback. Default 10. 290 * @return bool Whether the function existed before it was removed. 291 */ 292 function remove_filter( $hook_name, $callback, $priority = 10 ) { 293 global $wp_filter; 294 295 $r = false; 296 297 if ( isset( $wp_filter[ $hook_name ] ) ) { 298 $r = $wp_filter[ $hook_name ]->remove_filter( $hook_name, $callback, $priority ); 299 300 if ( ! $wp_filter[ $hook_name ]->callbacks ) { 301 unset( $wp_filter[ $hook_name ] ); 302 } 303 } 304 305 return $r; 306 } 307 308 /** 309 * Removes all of the callback functions from a filter hook. 310 * 311 * @since 2.7.0 312 * 313 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 314 * 315 * @param string $hook_name The filter to remove callbacks from. 316 * @param int|false $priority Optional. The priority number to remove them from. 317 * Default false. 318 * @return true Always returns true. 319 */ 320 function remove_all_filters( $hook_name, $priority = false ) { 321 global $wp_filter; 322 323 if ( isset( $wp_filter[ $hook_name ] ) ) { 324 $wp_filter[ $hook_name ]->remove_all_filters( $priority ); 325 326 if ( ! $wp_filter[ $hook_name ]->has_filters() ) { 327 unset( $wp_filter[ $hook_name ] ); 328 } 329 } 330 331 return true; 332 } 333 334 /** 335 * Retrieves the name of the current filter hook. 336 * 337 * @since 2.5.0 338 * 339 * @global string[] $wp_current_filter Stores the list of current filters with the current one last 340 * 341 * @return string Hook name of the current filter. 342 */ 343 function current_filter() { 344 global $wp_current_filter; 345 346 return end( $wp_current_filter ); 347 } 348 349 /** 350 * Returns whether or not a filter hook is currently being processed. 351 * 352 * The function current_filter() only returns the most recent filter or action 353 * being executed. did_action() returns true once the action is initially 354 * processed. 355 * 356 * This function allows detection for any filter currently being executed 357 * (regardless of whether it's the most recent filter to fire, in the case of 358 * hooks called from hook callbacks) to be verified. 359 * 360 * @since 3.9.0 361 * 362 * @see current_filter() 363 * @see did_action() 364 * @global string[] $wp_current_filter Current filter. 365 * 366 * @param null|string $hook_name Optional. Filter hook to check. Defaults to null, 367 * which checks if any filter is currently being run. 368 * @return bool Whether the filter is currently in the stack. 369 */ 370 function doing_filter( $hook_name = null ) { 371 global $wp_current_filter; 372 373 if ( null === $hook_name ) { 374 return ! empty( $wp_current_filter ); 375 } 376 377 return in_array( $hook_name, $wp_current_filter, true ); 378 } 379 380 /** 381 * Adds a callback function to an action hook. 382 * 383 * Actions are the hooks that the WordPress core launches at specific points 384 * during execution, or when specific events occur. Plugins can specify that 385 * one or more of its PHP functions are executed at these points, using the 386 * Action API. 387 * 388 * @since 1.2.0 389 * 390 * @param string $hook_name The name of the action to add the callback to. 391 * @param callable $callback The callback to be run when the action is called. 392 * @param int $priority Optional. Used to specify the order in which the functions 393 * associated with a particular action are executed. 394 * Lower numbers correspond with earlier execution, 395 * and functions with the same priority are executed 396 * in the order in which they were added to the action. Default 10. 397 * @param int $accepted_args Optional. The number of arguments the function accepts. Default 1. 398 * @return true Always returns true. 399 */ 400 function add_action( $hook_name, $callback, $priority = 10, $accepted_args = 1 ) { 401 return add_filter( $hook_name, $callback, $priority, $accepted_args ); 402 } 403 404 /** 405 * Calls the callback functions that have been added to an action hook. 406 * 407 * This function invokes all functions attached to action hook `$hook_name`. 408 * It is possible to create new action hooks by simply calling this function, 409 * specifying the name of the new hook using the `$hook_name` parameter. 410 * 411 * You can pass extra arguments to the hooks, much like you can with `apply_filters()`. 412 * 413 * Example usage: 414 * 415 * // The action callback function. 416 * function example_callback( $arg1, $arg2 ) { 417 * // (maybe) do something with the args. 418 * } 419 * add_action( 'example_action', 'example_callback', 10, 2 ); 420 * 421 * /* 422 * * Trigger the actions by calling the 'example_callback()' function 423 * * that's hooked onto `example_action` above. 424 * * 425 * * - 'example_action' is the action hook. 426 * * - $arg1 and $arg2 are the additional arguments passed to the callback. 427 * $value = do_action( 'example_action', $arg1, $arg2 ); 428 * 429 * @since 1.2.0 430 * @since 5.3.0 Formalized the existing and already documented `...$arg` parameter 431 * by adding it to the function signature. 432 * 433 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 434 * @global int[] $wp_actions Stores the number of times each action was triggered. 435 * @global string[] $wp_current_filter Stores the list of current filters with the current one last. 436 * 437 * @param string $hook_name The name of the action to be executed. 438 * @param mixed ...$arg Optional. Additional arguments which are passed on to the 439 * functions hooked to the action. Default empty. 440 */ 441 function do_action( $hook_name, ...$arg ) { 442 global $wp_filter, $wp_actions, $wp_current_filter; 443 444 if ( ! isset( $wp_actions[ $hook_name ] ) ) { 445 $wp_actions[ $hook_name ] = 1; 446 } else { 447 ++$wp_actions[ $hook_name ]; 448 } 449 450 // Do 'all' actions first. 451 if ( isset( $wp_filter['all'] ) ) { 452 $wp_current_filter[] = $hook_name; 453 $all_args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection 454 _wp_call_all_hook( $all_args ); 455 } 456 457 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 458 if ( isset( $wp_filter['all'] ) ) { 459 array_pop( $wp_current_filter ); 460 } 461 462 return; 463 } 464 465 if ( ! isset( $wp_filter['all'] ) ) { 466 $wp_current_filter[] = $hook_name; 467 } 468 469 if ( empty( $arg ) ) { 470 $arg[] = ''; 471 } elseif ( is_array( $arg[0] ) && 1 === count( $arg[0] ) && isset( $arg[0][0] ) && is_object( $arg[0][0] ) ) { 472 // Backward compatibility for PHP4-style passing of `array( &$this )` as action `$arg`. 473 $arg[0] = $arg[0][0]; 474 } 475 476 $wp_filter[ $hook_name ]->do_action( $arg ); 477 478 array_pop( $wp_current_filter ); 479 } 480 481 /** 482 * Calls the callback functions that have been added to an action hook, specifying arguments in an array. 483 * 484 * @since 2.1.0 485 * 486 * @see do_action() This function is identical, but the arguments passed to the 487 * functions hooked to `$hook_name` are supplied using an array. 488 * 489 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 490 * @global int[] $wp_actions Stores the number of times each action was triggered. 491 * @global string[] $wp_current_filter Stores the list of current filters with the current one last. 492 * 493 * @param string $hook_name The name of the action to be executed. 494 * @param array $args The arguments supplied to the functions hooked to `$hook_name`. 495 */ 496 function do_action_ref_array( $hook_name, $args ) { 497 global $wp_filter, $wp_actions, $wp_current_filter; 498 499 if ( ! isset( $wp_actions[ $hook_name ] ) ) { 500 $wp_actions[ $hook_name ] = 1; 501 } else { 502 ++$wp_actions[ $hook_name ]; 503 } 504 505 // Do 'all' actions first. 506 if ( isset( $wp_filter['all'] ) ) { 507 $wp_current_filter[] = $hook_name; 508 $all_args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection 509 _wp_call_all_hook( $all_args ); 510 } 511 512 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 513 if ( isset( $wp_filter['all'] ) ) { 514 array_pop( $wp_current_filter ); 515 } 516 517 return; 518 } 519 520 if ( ! isset( $wp_filter['all'] ) ) { 521 $wp_current_filter[] = $hook_name; 522 } 523 524 $wp_filter[ $hook_name ]->do_action( $args ); 525 526 array_pop( $wp_current_filter ); 527 } 528 529 /** 530 * Checks if any action has been registered for a hook. 531 * 532 * When using the `$callback` argument, this function may return a non-boolean value 533 * that evaluates to false (e.g. 0), so use the `===` operator for testing the return value. 534 * 535 * @since 2.5.0 536 * 537 * @see has_filter() has_action() is an alias of has_filter(). 538 * 539 * @param string $hook_name The name of the action hook. 540 * @param callable|string|array|false $callback Optional. The callback to check for. 541 * This function can be called unconditionally to speculatively check 542 * a callback that may or may not exist. Default false. 543 * @return bool|int If `$callback` is omitted, returns boolean for whether the hook has 544 * anything registered. When checking a specific function, the priority 545 * of that hook is returned, or false if the function is not attached. 546 */ 547 function has_action( $hook_name, $callback = false ) { 548 return has_filter( $hook_name, $callback ); 549 } 550 551 /** 552 * Removes a callback function from an action hook. 553 * 554 * This can be used to remove default functions attached to a specific action 555 * hook and possibly replace them with a substitute. 556 * 557 * To remove a hook, the `$callback` and `$priority` arguments must match 558 * when the hook was added. This goes for both filters and actions. No warning 559 * will be given on removal failure. 560 * 561 * @since 1.2.0 562 * 563 * @param string $hook_name The action hook to which the function to be removed is hooked. 564 * @param callable|string|array $callback The name of the function which should be removed. 565 * This function can be called unconditionally to speculatively remove 566 * a callback that may or may not exist. 567 * @param int $priority Optional. The exact priority used when adding the original 568 * action callback. Default 10. 569 * @return bool Whether the function is removed. 570 */ 571 function remove_action( $hook_name, $callback, $priority = 10 ) { 572 return remove_filter( $hook_name, $callback, $priority ); 573 } 574 575 /** 576 * Removes all of the callback functions from an action hook. 577 * 578 * @since 2.7.0 579 * 580 * @param string $hook_name The action to remove callbacks from. 581 * @param int|false $priority Optional. The priority number to remove them from. 582 * Default false. 583 * @return true Always returns true. 584 */ 585 function remove_all_actions( $hook_name, $priority = false ) { 586 return remove_all_filters( $hook_name, $priority ); 587 } 588 589 /** 590 * Retrieves the name of the current action hook. 591 * 592 * @since 3.9.0 593 * 594 * @return string Hook name of the current action. 595 */ 596 function current_action() { 597 return current_filter(); 598 } 599 600 /** 601 * Returns whether or not an action hook is currently being processed. 602 * 603 * @since 3.9.0 604 * 605 * @param string|null $hook_name Optional. Action hook to check. Defaults to null, 606 * which checks if any action is currently being run. 607 * @return bool Whether the action is currently in the stack. 608 */ 609 function doing_action( $hook_name = null ) { 610 return doing_filter( $hook_name ); 611 } 612 613 /** 614 * Retrieves the number of times an action has been fired during the current request. 615 * 616 * @since 2.1.0 617 * 618 * @global int[] $wp_actions Stores the number of times each action was triggered. 619 * 620 * @param string $hook_name The name of the action hook. 621 * @return int The number of times the action hook has been fired. 622 */ 623 function did_action( $hook_name ) { 624 global $wp_actions; 625 626 if ( ! isset( $wp_actions[ $hook_name ] ) ) { 627 return 0; 628 } 629 630 return $wp_actions[ $hook_name ]; 631 } 632 633 /** 634 * Fires functions attached to a deprecated filter hook. 635 * 636 * When a filter hook is deprecated, the apply_filters() call is replaced with 637 * apply_filters_deprecated(), which triggers a deprecation notice and then fires 638 * the original filter hook. 639 * 640 * Note: the value and extra arguments passed to the original apply_filters() call 641 * must be passed here to `$args` as an array. For example: 642 * 643 * // Old filter. 644 * return apply_filters( 'wpdocs_filter', $value, $extra_arg ); 645 * 646 * // Deprecated. 647 * return apply_filters_deprecated( 'wpdocs_filter', array( $value, $extra_arg ), '4.9.0', 'wpdocs_new_filter' ); 648 * 649 * @since 4.6.0 650 * 651 * @see _deprecated_hook() 652 * 653 * @param string $hook_name The name of the filter hook. 654 * @param array $args Array of additional function arguments to be passed to apply_filters(). 655 * @param string $version The version of WordPress that deprecated the hook. 656 * @param string $replacement Optional. The hook that should have been used. Default empty. 657 * @param string $message Optional. A message regarding the change. Default empty. 658 */ 659 function apply_filters_deprecated( $hook_name, $args, $version, $replacement = '', $message = '' ) { 660 if ( ! has_filter( $hook_name ) ) { 661 return $args[0]; 662 } 663 664 _deprecated_hook( $hook_name, $version, $replacement, $message ); 665 666 return apply_filters_ref_array( $hook_name, $args ); 667 } 668 669 /** 670 * Fires functions attached to a deprecated action hook. 671 * 672 * When an action hook is deprecated, the do_action() call is replaced with 673 * do_action_deprecated(), which triggers a deprecation notice and then fires 674 * the original hook. 675 * 676 * @since 4.6.0 677 * 678 * @see _deprecated_hook() 679 * 680 * @param string $hook_name The name of the action hook. 681 * @param array $args Array of additional function arguments to be passed to do_action(). 682 * @param string $version The version of WordPress that deprecated the hook. 683 * @param string $replacement Optional. The hook that should have been used. Default empty. 684 * @param string $message Optional. A message regarding the change. Default empty. 685 */ 686 function do_action_deprecated( $hook_name, $args, $version, $replacement = '', $message = '' ) { 687 if ( ! has_action( $hook_name ) ) { 688 return; 689 } 690 691 _deprecated_hook( $hook_name, $version, $replacement, $message ); 692 693 do_action_ref_array( $hook_name, $args ); 694 } 695 696 // 697 // Functions for handling plugins. 698 // 699 700 /** 701 * Gets the basename of a plugin. 702 * 703 * This method extracts the name of a plugin from its filename. 704 * 705 * @since 1.5.0 706 * 707 * @global array $wp_plugin_paths 708 * 709 * @param string $file The filename of plugin. 710 * @return string The name of a plugin. 711 */ 712 function plugin_basename( $file ) { 713 global $wp_plugin_paths; 714 715 // $wp_plugin_paths contains normalized paths. 716 $file = wp_normalize_path( $file ); 717 718 arsort( $wp_plugin_paths ); 719 720 foreach ( $wp_plugin_paths as $dir => $realdir ) { 721 if ( strpos( $file, $realdir ) === 0 ) { 722 $file = $dir . substr( $file, strlen( $realdir ) ); 723 } 724 } 725 726 $plugin_dir = wp_normalize_path( WP_PLUGIN_DIR ); 727 $mu_plugin_dir = wp_normalize_path( WPMU_PLUGIN_DIR ); 728 729 // Get relative path from plugins directory. 730 $file = preg_replace( '#^' . preg_quote( $plugin_dir, '#' ) . '/|^' . preg_quote( $mu_plugin_dir, '#' ) . '/#', '', $file ); 731 $file = trim( $file, '/' ); 732 return $file; 733 } 734 735 /** 736 * Register a plugin's real path. 737 * 738 * This is used in plugin_basename() to resolve symlinked paths. 739 * 740 * @since 3.9.0 741 * 742 * @see wp_normalize_path() 743 * 744 * @global array $wp_plugin_paths 745 * 746 * @param string $file Known path to the file. 747 * @return bool Whether the path was able to be registered. 748 */ 749 function wp_register_plugin_realpath( $file ) { 750 global $wp_plugin_paths; 751 752 // Normalize, but store as static to avoid recalculation of a constant value. 753 static $wp_plugin_path = null, $wpmu_plugin_path = null; 754 755 if ( ! isset( $wp_plugin_path ) ) { 756 $wp_plugin_path = wp_normalize_path( WP_PLUGIN_DIR ); 757 $wpmu_plugin_path = wp_normalize_path( WPMU_PLUGIN_DIR ); 758 } 759 760 $plugin_path = wp_normalize_path( dirname( $file ) ); 761 $plugin_realpath = wp_normalize_path( dirname( realpath( $file ) ) ); 762 763 if ( $plugin_path === $wp_plugin_path || $plugin_path === $wpmu_plugin_path ) { 764 return false; 765 } 766 767 if ( $plugin_path !== $plugin_realpath ) { 768 $wp_plugin_paths[ $plugin_path ] = $plugin_realpath; 769 } 770 771 return true; 772 } 773 774 /** 775 * Get the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in. 776 * 777 * @since 2.8.0 778 * 779 * @param string $file The filename of the plugin (__FILE__). 780 * @return string the filesystem path of the directory that contains the plugin. 781 */ 782 function plugin_dir_path( $file ) { 783 return trailingslashit( dirname( $file ) ); 784 } 785 786 /** 787 * Get the URL directory path (with trailing slash) for the plugin __FILE__ passed in. 788 * 789 * @since 2.8.0 790 * 791 * @param string $file The filename of the plugin (__FILE__). 792 * @return string the URL path of the directory that contains the plugin. 793 */ 794 function plugin_dir_url( $file ) { 795 return trailingslashit( plugins_url( '', $file ) ); 796 } 797 798 /** 799 * Set the activation hook for a plugin. 800 * 801 * When a plugin is activated, the action 'activate_PLUGINNAME' hook is 802 * called. In the name of this hook, PLUGINNAME is replaced with the name 803 * of the plugin, including the optional subdirectory. For example, when the 804 * plugin is located in wp-content/plugins/sampleplugin/sample.php, then 805 * the name of this hook will become 'activate_sampleplugin/sample.php'. 806 * 807 * When the plugin consists of only one file and is (as by default) located at 808 * wp-content/plugins/sample.php the name of this hook will be 809 * 'activate_sample.php'. 810 * 811 * @since 2.0.0 812 * 813 * @param string $file The filename of the plugin including the path. 814 * @param callable $callback The function hooked to the 'activate_PLUGIN' action. 815 */ 816 function register_activation_hook( $file, $callback ) { 817 $file = plugin_basename( $file ); 818 add_action( 'activate_' . $file, $callback ); 819 } 820 821 /** 822 * Sets the deactivation hook for a plugin. 823 * 824 * When a plugin is deactivated, the action 'deactivate_PLUGINNAME' hook is 825 * called. In the name of this hook, PLUGINNAME is replaced with the name 826 * of the plugin, including the optional subdirectory. For example, when the 827 * plugin is located in wp-content/plugins/sampleplugin/sample.php, then 828 * the name of this hook will become 'deactivate_sampleplugin/sample.php'. 829 * 830 * When the plugin consists of only one file and is (as by default) located at 831 * wp-content/plugins/sample.php the name of this hook will be 832 * 'deactivate_sample.php'. 833 * 834 * @since 2.0.0 835 * 836 * @param string $file The filename of the plugin including the path. 837 * @param callable $callback The function hooked to the 'deactivate_PLUGIN' action. 838 */ 839 function register_deactivation_hook( $file, $callback ) { 840 $file = plugin_basename( $file ); 841 add_action( 'deactivate_' . $file, $callback ); 842 } 843 844 /** 845 * Sets the uninstallation hook for a plugin. 846 * 847 * Registers the uninstall hook that will be called when the user clicks on the 848 * uninstall link that calls for the plugin to uninstall itself. The link won't 849 * be active unless the plugin hooks into the action. 850 * 851 * The plugin should not run arbitrary code outside of functions, when 852 * registering the uninstall hook. In order to run using the hook, the plugin 853 * will have to be included, which means that any code laying outside of a 854 * function will be run during the uninstallation process. The plugin should not 855 * hinder the uninstallation process. 856 * 857 * If the plugin can not be written without running code within the plugin, then 858 * the plugin should create a file named 'uninstall.php' in the base plugin 859 * folder. This file will be called, if it exists, during the uninstallation process 860 * bypassing the uninstall hook. The plugin, when using the 'uninstall.php' 861 * should always check for the 'WP_UNINSTALL_PLUGIN' constant, before 862 * executing. 863 * 864 * @since 2.7.0 865 * 866 * @param string $file Plugin file. 867 * @param callable $callback The callback to run when the hook is called. Must be 868 * a static method or function. 869 */ 870 function register_uninstall_hook( $file, $callback ) { 871 if ( is_array( $callback ) && is_object( $callback[0] ) ) { 872 _doing_it_wrong( __FUNCTION__, __( 'Only a static class method or function can be used in an uninstall hook.' ), '3.1.0' ); 873 return; 874 } 875 876 /* 877 * The option should not be autoloaded, because it is not needed in most 878 * cases. Emphasis should be put on using the 'uninstall.php' way of 879 * uninstalling the plugin. 880 */ 881 $uninstallable_plugins = (array) get_option( 'uninstall_plugins' ); 882 $plugin_basename = plugin_basename( $file ); 883 884 if ( ! isset( $uninstallable_plugins[ $plugin_basename ] ) || $uninstallable_plugins[ $plugin_basename ] !== $callback ) { 885 $uninstallable_plugins[ $plugin_basename ] = $callback; 886 update_option( 'uninstall_plugins', $uninstallable_plugins ); 887 } 888 } 889 890 /** 891 * Calls the 'all' hook, which will process the functions hooked into it. 892 * 893 * The 'all' hook passes all of the arguments or parameters that were used for 894 * the hook, which this function was called for. 895 * 896 * This function is used internally for apply_filters(), do_action(), and 897 * do_action_ref_array() and is not meant to be used from outside those 898 * functions. This function does not check for the existence of the all hook, so 899 * it will fail unless the all hook exists prior to this function call. 900 * 901 * @since 2.5.0 902 * @access private 903 * 904 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 905 * 906 * @param array $args The collected parameters from the hook that was called. 907 */ 908 function _wp_call_all_hook( $args ) { 909 global $wp_filter; 910 911 $wp_filter['all']->do_all_hook( $args ); 912 } 913 914 /** 915 * Builds Unique ID for storage and retrieval. 916 * 917 * The old way to serialize the callback caused issues and this function is the 918 * solution. It works by checking for objects and creating a new property in 919 * the class to keep track of the object and new objects of the same class that 920 * need to be added. 921 * 922 * It also allows for the removal of actions and filters for objects after they 923 * change class properties. It is possible to include the property $wp_filter_id 924 * in your class and set it to "null" or a number to bypass the workaround. 925 * However this will prevent you from adding new classes and any new classes 926 * will overwrite the previous hook by the same class. 927 * 928 * Functions and static method callbacks are just returned as strings and 929 * shouldn't have any speed penalty. 930 * 931 * @link https://core.trac.wordpress.org/ticket/3875 932 * 933 * @since 2.2.3 934 * @since 5.3.0 Removed workarounds for spl_object_hash(). 935 * `$hook_name` and `$priority` are no longer used, 936 * and the function always returns a string. 937 * 938 * @access private 939 * 940 * @param string $hook_name Unused. The name of the filter to build ID for. 941 * @param callable|string|array $callback The callback to generate ID for. The callback may 942 * or may not exist. 943 * @param int $priority Unused. The order in which the functions 944 * associated with a particular action are executed. 945 * @return string Unique function ID for usage as array key. 946 */ 947 function _wp_filter_build_unique_id( $hook_name, $callback, $priority ) { 948 if ( is_string( $callback ) ) { 949 return $callback; 950 } 951 952 if ( is_object( $callback ) ) { 953 // Closures are currently implemented as objects. 954 $callback = array( $callback, '' ); 955 } else { 956 $callback = (array) $callback; 957 } 958 959 if ( is_object( $callback[0] ) ) { 960 // Object class calling. 961 return spl_object_hash( $callback[0] ) . $callback[1]; 962 } elseif ( is_string( $callback[0] ) ) { 963 // Static calling. 964 return $callback[0] . '::' . $callback[1]; 965 } 966 }
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