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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 int[] $wp_filters */ 34 global $wp_filters; 35 36 /** @var string[] $wp_current_filter */ 37 global $wp_current_filter; 38 39 if ( $wp_filter ) { 40 $wp_filter = WP_Hook::build_preinitialized_hooks( $wp_filter ); 41 } else { 42 $wp_filter = array(); 43 } 44 45 if ( ! isset( $wp_actions ) ) { 46 $wp_actions = array(); 47 } 48 49 if ( ! isset( $wp_filters ) ) { 50 $wp_filters = array(); 51 } 52 53 if ( ! isset( $wp_current_filter ) ) { 54 $wp_current_filter = array(); 55 } 56 57 /** 58 * Adds a callback function to a filter hook. 59 * 60 * WordPress offers filter hooks to allow plugins to modify 61 * various types of internal data at runtime. 62 * 63 * A plugin can modify data by binding a callback to a filter hook. When the filter 64 * is later applied, each bound callback is run in order of priority, and given 65 * the opportunity to modify a value by returning a new value. 66 * 67 * The following example shows how a callback function is bound to a filter hook. 68 * 69 * Note that `$example` is passed to the callback, (maybe) modified, then returned: 70 * 71 * function example_callback( $example ) { 72 * // Maybe modify $example in some way. 73 * return $example; 74 * } 75 * add_filter( 'example_filter', 'example_callback' ); 76 * 77 * Bound callbacks can accept from none to the total number of arguments passed as parameters 78 * in the corresponding apply_filters() call. 79 * 80 * In other words, if an apply_filters() call passes four total arguments, callbacks bound to 81 * it can accept none (the same as 1) of the arguments or up to four. The important part is that 82 * the `$accepted_args` value must reflect the number of arguments the bound callback *actually* 83 * opted to accept. If no arguments were accepted by the callback that is considered to be the 84 * same as accepting 1 argument. For example: 85 * 86 * // Filter call. 87 * $value = apply_filters( 'hook', $value, $arg2, $arg3 ); 88 * 89 * // Accepting zero/one arguments. 90 * function example_callback() { 91 * ... 92 * return 'some value'; 93 * } 94 * add_filter( 'hook', 'example_callback' ); // Where $priority is default 10, $accepted_args is default 1. 95 * 96 * // Accepting two arguments (three possible). 97 * function example_callback( $value, $arg2 ) { 98 * ... 99 * return $maybe_modified_value; 100 * } 101 * add_filter( 'hook', 'example_callback', 10, 2 ); // Where $priority is 10, $accepted_args is 2. 102 * 103 * *Note:* The function will return true whether or not the callback is valid. 104 * It is up to you to take care. This is done for optimization purposes, so 105 * everything is as quick as possible. 106 * 107 * @since 0.71 108 * 109 * @global WP_Hook[] $wp_filter A multidimensional array of all hooks and the callbacks hooked to them. 110 * 111 * @param string $hook_name The name of the filter to add the callback to. 112 * @param callable $callback The callback to be run when the filter is applied. 113 * @param int $priority Optional. Used to specify the order in which the functions 114 * associated with a particular filter are executed. 115 * Lower numbers correspond with earlier execution, 116 * and functions with the same priority are executed 117 * in the order in which they were added to the filter. Default 10. 118 * @param int $accepted_args Optional. The number of arguments the function accepts. Default 1. 119 * @return true Always returns true. 120 */ 121 function add_filter( $hook_name, $callback, $priority = 10, $accepted_args = 1 ) { 122 global $wp_filter; 123 124 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 125 $wp_filter[ $hook_name ] = new WP_Hook(); 126 } 127 128 $wp_filter[ $hook_name ]->add_filter( $hook_name, $callback, $priority, $accepted_args ); 129 130 return true; 131 } 132 133 /** 134 * Calls the callback functions that have been added to a filter hook. 135 * 136 * This function invokes all functions attached to filter hook `$hook_name`. 137 * It is possible to create new filter hooks by simply calling this function, 138 * specifying the name of the new hook using the `$hook_name` parameter. 139 * 140 * The function also allows for multiple additional arguments to be passed to hooks. 141 * 142 * Example usage: 143 * 144 * // The filter callback function. 145 * function example_callback( $string, $arg1, $arg2 ) { 146 * // (maybe) modify $string. 147 * return $string; 148 * } 149 * add_filter( 'example_filter', 'example_callback', 10, 3 ); 150 * 151 * /* 152 * * Apply the filters by calling the 'example_callback()' function 153 * * that's hooked onto `example_filter` above. 154 * * 155 * * - 'example_filter' is the filter hook. 156 * * - 'filter me' is the value being filtered. 157 * * - $arg1 and $arg2 are the additional arguments passed to the callback. 158 * $value = apply_filters( 'example_filter', 'filter me', $arg1, $arg2 ); 159 * 160 * @since 0.71 161 * @since 6.0.0 Formalized the existing and already documented `...$args` parameter 162 * by adding it to the function signature. 163 * 164 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 165 * @global int[] $wp_filters Stores the number of times each filter was triggered. 166 * @global string[] $wp_current_filter Stores the list of current filters with the current one last. 167 * 168 * @param string $hook_name The name of the filter hook. 169 * @param mixed $value The value to filter. 170 * @param mixed ...$args Optional. Additional parameters to pass to the callback functions. 171 * @return mixed The filtered value after all hooked functions are applied to it. 172 */ 173 function apply_filters( $hook_name, $value, ...$args ) { 174 global $wp_filter, $wp_filters, $wp_current_filter; 175 176 if ( ! isset( $wp_filters[ $hook_name ] ) ) { 177 $wp_filters[ $hook_name ] = 1; 178 } else { 179 ++$wp_filters[ $hook_name ]; 180 } 181 182 // Do 'all' actions first. 183 if ( isset( $wp_filter['all'] ) ) { 184 $wp_current_filter[] = $hook_name; 185 186 $all_args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection 187 _wp_call_all_hook( $all_args ); 188 } 189 190 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 191 if ( isset( $wp_filter['all'] ) ) { 192 array_pop( $wp_current_filter ); 193 } 194 195 return $value; 196 } 197 198 if ( ! isset( $wp_filter['all'] ) ) { 199 $wp_current_filter[] = $hook_name; 200 } 201 202 // Pass the value to WP_Hook. 203 array_unshift( $args, $value ); 204 205 $filtered = $wp_filter[ $hook_name ]->apply_filters( $value, $args ); 206 207 array_pop( $wp_current_filter ); 208 209 return $filtered; 210 } 211 212 /** 213 * Calls the callback functions that have been added to a filter hook, specifying arguments in an array. 214 * 215 * @since 3.0.0 216 * 217 * @see apply_filters() This function is identical, but the arguments passed to the 218 * functions hooked to `$hook_name` are supplied using an array. 219 * 220 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 221 * @global int[] $wp_filters Stores the number of times each filter was triggered. 222 * @global string[] $wp_current_filter Stores the list of current filters with the current one last. 223 * 224 * @param string $hook_name The name of the filter hook. 225 * @param array $args The arguments supplied to the functions hooked to `$hook_name`. 226 * @return mixed The filtered value after all hooked functions are applied to it. 227 */ 228 function apply_filters_ref_array( $hook_name, $args ) { 229 global $wp_filter, $wp_filters, $wp_current_filter; 230 231 if ( ! isset( $wp_filters[ $hook_name ] ) ) { 232 $wp_filters[ $hook_name ] = 1; 233 } else { 234 ++$wp_filters[ $hook_name ]; 235 } 236 237 // Do 'all' actions first. 238 if ( isset( $wp_filter['all'] ) ) { 239 $wp_current_filter[] = $hook_name; 240 $all_args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection 241 _wp_call_all_hook( $all_args ); 242 } 243 244 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 245 if ( isset( $wp_filter['all'] ) ) { 246 array_pop( $wp_current_filter ); 247 } 248 249 return $args[0]; 250 } 251 252 if ( ! isset( $wp_filter['all'] ) ) { 253 $wp_current_filter[] = $hook_name; 254 } 255 256 $filtered = $wp_filter[ $hook_name ]->apply_filters( $args[0], $args ); 257 258 array_pop( $wp_current_filter ); 259 260 return $filtered; 261 } 262 263 /** 264 * Checks if any filter has been registered for a hook. 265 * 266 * When using the `$callback` argument, this function may return a non-boolean value 267 * that evaluates to false (e.g. 0), so use the `===` operator for testing the return value. 268 * 269 * @since 2.5.0 270 * 271 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 272 * 273 * @param string $hook_name The name of the filter hook. 274 * @param callable|string|array|false $callback Optional. The callback to check for. 275 * This function can be called unconditionally to speculatively check 276 * a callback that may or may not exist. Default false. 277 * @return bool|int If `$callback` is omitted, returns boolean for whether the hook has 278 * anything registered. When checking a specific function, the priority 279 * of that hook is returned, or false if the function is not attached. 280 */ 281 function has_filter( $hook_name, $callback = false ) { 282 global $wp_filter; 283 284 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 285 return false; 286 } 287 288 return $wp_filter[ $hook_name ]->has_filter( $hook_name, $callback ); 289 } 290 291 /** 292 * Removes a callback function from a filter hook. 293 * 294 * This can be used to remove default functions attached to a specific filter 295 * hook and possibly replace them with a substitute. 296 * 297 * To remove a hook, the `$callback` and `$priority` arguments must match 298 * when the hook was added. This goes for both filters and actions. No warning 299 * will be given on removal failure. 300 * 301 * @since 1.2.0 302 * 303 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 304 * 305 * @param string $hook_name The filter hook to which the function to be removed is hooked. 306 * @param callable|string|array $callback The callback to be removed from running when the filter is applied. 307 * This function can be called unconditionally to speculatively remove 308 * a callback that may or may not exist. 309 * @param int $priority Optional. The exact priority used when adding the original 310 * filter callback. Default 10. 311 * @return bool Whether the function existed before it was removed. 312 */ 313 function remove_filter( $hook_name, $callback, $priority = 10 ) { 314 global $wp_filter; 315 316 $r = false; 317 318 if ( isset( $wp_filter[ $hook_name ] ) ) { 319 $r = $wp_filter[ $hook_name ]->remove_filter( $hook_name, $callback, $priority ); 320 321 if ( ! $wp_filter[ $hook_name ]->callbacks ) { 322 unset( $wp_filter[ $hook_name ] ); 323 } 324 } 325 326 return $r; 327 } 328 329 /** 330 * Removes all of the callback functions from a filter hook. 331 * 332 * @since 2.7.0 333 * 334 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 335 * 336 * @param string $hook_name The filter to remove callbacks from. 337 * @param int|false $priority Optional. The priority number to remove them from. 338 * Default false. 339 * @return true Always returns true. 340 */ 341 function remove_all_filters( $hook_name, $priority = false ) { 342 global $wp_filter; 343 344 if ( isset( $wp_filter[ $hook_name ] ) ) { 345 $wp_filter[ $hook_name ]->remove_all_filters( $priority ); 346 347 if ( ! $wp_filter[ $hook_name ]->has_filters() ) { 348 unset( $wp_filter[ $hook_name ] ); 349 } 350 } 351 352 return true; 353 } 354 355 /** 356 * Retrieves the name of the current filter hook. 357 * 358 * @since 2.5.0 359 * 360 * @global string[] $wp_current_filter Stores the list of current filters with the current one last 361 * 362 * @return string Hook name of the current filter. 363 */ 364 function current_filter() { 365 global $wp_current_filter; 366 367 return end( $wp_current_filter ); 368 } 369 370 /** 371 * Returns whether or not a filter hook is currently being processed. 372 * 373 * The function current_filter() only returns the most recent filter being executed. 374 * did_filter() returns the number of times a filter has been applied during 375 * the current request. 376 * 377 * This function allows detection for any filter currently being executed 378 * (regardless of whether it's the most recent filter to fire, in the case of 379 * hooks called from hook callbacks) to be verified. 380 * 381 * @since 3.9.0 382 * 383 * @see current_filter() 384 * @see did_filter() 385 * @global string[] $wp_current_filter Current filter. 386 * 387 * @param string|null $hook_name Optional. Filter hook to check. Defaults to null, 388 * which checks if any filter is currently being run. 389 * @return bool Whether the filter is currently in the stack. 390 */ 391 function doing_filter( $hook_name = null ) { 392 global $wp_current_filter; 393 394 if ( null === $hook_name ) { 395 return ! empty( $wp_current_filter ); 396 } 397 398 return in_array( $hook_name, $wp_current_filter, true ); 399 } 400 401 /** 402 * Retrieves the number of times a filter has been applied during the current request. 403 * 404 * @since 6.1.0 405 * 406 * @global int[] $wp_filters Stores the number of times each filter was triggered. 407 * 408 * @param string $hook_name The name of the filter hook. 409 * @return int The number of times the filter hook has been applied. 410 */ 411 function did_filter( $hook_name ) { 412 global $wp_filters; 413 414 if ( ! isset( $wp_filters[ $hook_name ] ) ) { 415 return 0; 416 } 417 418 return $wp_filters[ $hook_name ]; 419 } 420 421 /** 422 * Adds a callback function to an action hook. 423 * 424 * Actions are the hooks that the WordPress core launches at specific points 425 * during execution, or when specific events occur. Plugins can specify that 426 * one or more of its PHP functions are executed at these points, using the 427 * Action API. 428 * 429 * @since 1.2.0 430 * 431 * @param string $hook_name The name of the action to add the callback to. 432 * @param callable $callback The callback to be run when the action is called. 433 * @param int $priority Optional. Used to specify the order in which the functions 434 * associated with a particular action are executed. 435 * Lower numbers correspond with earlier execution, 436 * and functions with the same priority are executed 437 * in the order in which they were added to the action. Default 10. 438 * @param int $accepted_args Optional. The number of arguments the function accepts. Default 1. 439 * @return true Always returns true. 440 */ 441 function add_action( $hook_name, $callback, $priority = 10, $accepted_args = 1 ) { 442 return add_filter( $hook_name, $callback, $priority, $accepted_args ); 443 } 444 445 /** 446 * Calls the callback functions that have been added to an action hook. 447 * 448 * This function invokes all functions attached to action hook `$hook_name`. 449 * It is possible to create new action hooks by simply calling this function, 450 * specifying the name of the new hook using the `$hook_name` parameter. 451 * 452 * You can pass extra arguments to the hooks, much like you can with `apply_filters()`. 453 * 454 * Example usage: 455 * 456 * // The action callback function. 457 * function example_callback( $arg1, $arg2 ) { 458 * // (maybe) do something with the args. 459 * } 460 * add_action( 'example_action', 'example_callback', 10, 2 ); 461 * 462 * /* 463 * * Trigger the actions by calling the 'example_callback()' function 464 * * that's hooked onto `example_action` above. 465 * * 466 * * - 'example_action' is the action hook. 467 * * - $arg1 and $arg2 are the additional arguments passed to the callback. 468 * do_action( 'example_action', $arg1, $arg2 ); 469 * 470 * @since 1.2.0 471 * @since 5.3.0 Formalized the existing and already documented `...$arg` parameter 472 * by adding it to the function signature. 473 * 474 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 475 * @global int[] $wp_actions Stores the number of times each action was triggered. 476 * @global string[] $wp_current_filter Stores the list of current filters with the current one last. 477 * 478 * @param string $hook_name The name of the action to be executed. 479 * @param mixed ...$arg Optional. Additional arguments which are passed on to the 480 * functions hooked to the action. Default empty. 481 */ 482 function do_action( $hook_name, ...$arg ) { 483 global $wp_filter, $wp_actions, $wp_current_filter; 484 485 if ( ! isset( $wp_actions[ $hook_name ] ) ) { 486 $wp_actions[ $hook_name ] = 1; 487 } else { 488 ++$wp_actions[ $hook_name ]; 489 } 490 491 // Do 'all' actions first. 492 if ( isset( $wp_filter['all'] ) ) { 493 $wp_current_filter[] = $hook_name; 494 $all_args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection 495 _wp_call_all_hook( $all_args ); 496 } 497 498 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 499 if ( isset( $wp_filter['all'] ) ) { 500 array_pop( $wp_current_filter ); 501 } 502 503 return; 504 } 505 506 if ( ! isset( $wp_filter['all'] ) ) { 507 $wp_current_filter[] = $hook_name; 508 } 509 510 if ( empty( $arg ) ) { 511 $arg[] = ''; 512 } elseif ( is_array( $arg[0] ) && 1 === count( $arg[0] ) && isset( $arg[0][0] ) && is_object( $arg[0][0] ) ) { 513 // Backward compatibility for PHP4-style passing of `array( &$this )` as action `$arg`. 514 $arg[0] = $arg[0][0]; 515 } 516 517 $wp_filter[ $hook_name ]->do_action( $arg ); 518 519 array_pop( $wp_current_filter ); 520 } 521 522 /** 523 * Calls the callback functions that have been added to an action hook, specifying arguments in an array. 524 * 525 * @since 2.1.0 526 * 527 * @see do_action() This function is identical, but the arguments passed to the 528 * functions hooked to `$hook_name` are supplied using an array. 529 * 530 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 531 * @global int[] $wp_actions Stores the number of times each action was triggered. 532 * @global string[] $wp_current_filter Stores the list of current filters with the current one last. 533 * 534 * @param string $hook_name The name of the action to be executed. 535 * @param array $args The arguments supplied to the functions hooked to `$hook_name`. 536 */ 537 function do_action_ref_array( $hook_name, $args ) { 538 global $wp_filter, $wp_actions, $wp_current_filter; 539 540 if ( ! isset( $wp_actions[ $hook_name ] ) ) { 541 $wp_actions[ $hook_name ] = 1; 542 } else { 543 ++$wp_actions[ $hook_name ]; 544 } 545 546 // Do 'all' actions first. 547 if ( isset( $wp_filter['all'] ) ) { 548 $wp_current_filter[] = $hook_name; 549 $all_args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection 550 _wp_call_all_hook( $all_args ); 551 } 552 553 if ( ! isset( $wp_filter[ $hook_name ] ) ) { 554 if ( isset( $wp_filter['all'] ) ) { 555 array_pop( $wp_current_filter ); 556 } 557 558 return; 559 } 560 561 if ( ! isset( $wp_filter['all'] ) ) { 562 $wp_current_filter[] = $hook_name; 563 } 564 565 $wp_filter[ $hook_name ]->do_action( $args ); 566 567 array_pop( $wp_current_filter ); 568 } 569 570 /** 571 * Checks if any action has been registered for a hook. 572 * 573 * When using the `$callback` argument, this function may return a non-boolean value 574 * that evaluates to false (e.g. 0), so use the `===` operator for testing the return value. 575 * 576 * @since 2.5.0 577 * 578 * @see has_filter() This function is an alias of has_filter(). 579 * 580 * @param string $hook_name The name of the action hook. 581 * @param callable|string|array|false $callback Optional. The callback to check for. 582 * This function can be called unconditionally to speculatively check 583 * a callback that may or may not exist. Default false. 584 * @return bool|int If `$callback` is omitted, returns boolean for whether the hook has 585 * anything registered. When checking a specific function, the priority 586 * of that hook is returned, or false if the function is not attached. 587 */ 588 function has_action( $hook_name, $callback = false ) { 589 return has_filter( $hook_name, $callback ); 590 } 591 592 /** 593 * Removes a callback function from an action hook. 594 * 595 * This can be used to remove default functions attached to a specific action 596 * hook and possibly replace them with a substitute. 597 * 598 * To remove a hook, the `$callback` and `$priority` arguments must match 599 * when the hook was added. This goes for both filters and actions. No warning 600 * will be given on removal failure. 601 * 602 * @since 1.2.0 603 * 604 * @param string $hook_name The action hook to which the function to be removed is hooked. 605 * @param callable|string|array $callback The name of the function which should be removed. 606 * This function can be called unconditionally to speculatively remove 607 * a callback that may or may not exist. 608 * @param int $priority Optional. The exact priority used when adding the original 609 * action callback. Default 10. 610 * @return bool Whether the function is removed. 611 */ 612 function remove_action( $hook_name, $callback, $priority = 10 ) { 613 return remove_filter( $hook_name, $callback, $priority ); 614 } 615 616 /** 617 * Removes all of the callback functions from an action hook. 618 * 619 * @since 2.7.0 620 * 621 * @param string $hook_name The action to remove callbacks from. 622 * @param int|false $priority Optional. The priority number to remove them from. 623 * Default false. 624 * @return true Always returns true. 625 */ 626 function remove_all_actions( $hook_name, $priority = false ) { 627 return remove_all_filters( $hook_name, $priority ); 628 } 629 630 /** 631 * Retrieves the name of the current action hook. 632 * 633 * @since 3.9.0 634 * 635 * @return string Hook name of the current action. 636 */ 637 function current_action() { 638 return current_filter(); 639 } 640 641 /** 642 * Returns whether or not an action hook is currently being processed. 643 * 644 * The function current_action() only returns the most recent action being executed. 645 * did_action() returns the number of times an action has been fired during 646 * the current request. 647 * 648 * This function allows detection for any action currently being executed 649 * (regardless of whether it's the most recent action to fire, in the case of 650 * hooks called from hook callbacks) to be verified. 651 * 652 * @since 3.9.0 653 * 654 * @see current_action() 655 * @see did_action() 656 * 657 * @param string|null $hook_name Optional. Action hook to check. Defaults to null, 658 * which checks if any action is currently being run. 659 * @return bool Whether the action is currently in the stack. 660 */ 661 function doing_action( $hook_name = null ) { 662 return doing_filter( $hook_name ); 663 } 664 665 /** 666 * Retrieves the number of times an action has been fired during the current request. 667 * 668 * @since 2.1.0 669 * 670 * @global int[] $wp_actions Stores the number of times each action was triggered. 671 * 672 * @param string $hook_name The name of the action hook. 673 * @return int The number of times the action hook has been fired. 674 */ 675 function did_action( $hook_name ) { 676 global $wp_actions; 677 678 if ( ! isset( $wp_actions[ $hook_name ] ) ) { 679 return 0; 680 } 681 682 return $wp_actions[ $hook_name ]; 683 } 684 685 /** 686 * Fires functions attached to a deprecated filter hook. 687 * 688 * When a filter hook is deprecated, the apply_filters() call is replaced with 689 * apply_filters_deprecated(), which triggers a deprecation notice and then fires 690 * the original filter hook. 691 * 692 * Note: the value and extra arguments passed to the original apply_filters() call 693 * must be passed here to `$args` as an array. For example: 694 * 695 * // Old filter. 696 * return apply_filters( 'wpdocs_filter', $value, $extra_arg ); 697 * 698 * // Deprecated. 699 * return apply_filters_deprecated( 'wpdocs_filter', array( $value, $extra_arg ), '4.9.0', 'wpdocs_new_filter' ); 700 * 701 * @since 4.6.0 702 * 703 * @see _deprecated_hook() 704 * 705 * @param string $hook_name The name of the filter hook. 706 * @param array $args Array of additional function arguments to be passed to apply_filters(). 707 * @param string $version The version of WordPress that deprecated the hook. 708 * @param string $replacement Optional. The hook that should have been used. Default empty. 709 * @param string $message Optional. A message regarding the change. Default empty. 710 * @return mixed The filtered value after all hooked functions are applied to it. 711 */ 712 function apply_filters_deprecated( $hook_name, $args, $version, $replacement = '', $message = '' ) { 713 if ( ! has_filter( $hook_name ) ) { 714 return $args[0]; 715 } 716 717 _deprecated_hook( $hook_name, $version, $replacement, $message ); 718 719 return apply_filters_ref_array( $hook_name, $args ); 720 } 721 722 /** 723 * Fires functions attached to a deprecated action hook. 724 * 725 * When an action hook is deprecated, the do_action() call is replaced with 726 * do_action_deprecated(), which triggers a deprecation notice and then fires 727 * the original hook. 728 * 729 * @since 4.6.0 730 * 731 * @see _deprecated_hook() 732 * 733 * @param string $hook_name The name of the action hook. 734 * @param array $args Array of additional function arguments to be passed to do_action(). 735 * @param string $version The version of WordPress that deprecated the hook. 736 * @param string $replacement Optional. The hook that should have been used. Default empty. 737 * @param string $message Optional. A message regarding the change. Default empty. 738 */ 739 function do_action_deprecated( $hook_name, $args, $version, $replacement = '', $message = '' ) { 740 if ( ! has_action( $hook_name ) ) { 741 return; 742 } 743 744 _deprecated_hook( $hook_name, $version, $replacement, $message ); 745 746 do_action_ref_array( $hook_name, $args ); 747 } 748 749 // 750 // Functions for handling plugins. 751 // 752 753 /** 754 * Gets the basename of a plugin. 755 * 756 * This method extracts the name of a plugin from its filename. 757 * 758 * @since 1.5.0 759 * 760 * @global array $wp_plugin_paths 761 * 762 * @param string $file The filename of plugin. 763 * @return string The name of a plugin. 764 */ 765 function plugin_basename( $file ) { 766 global $wp_plugin_paths; 767 768 // $wp_plugin_paths contains normalized paths. 769 $file = wp_normalize_path( $file ); 770 771 arsort( $wp_plugin_paths ); 772 773 foreach ( $wp_plugin_paths as $dir => $realdir ) { 774 if ( str_starts_with( $file, $realdir ) ) { 775 $file = $dir . substr( $file, strlen( $realdir ) ); 776 } 777 } 778 779 $plugin_dir = wp_normalize_path( WP_PLUGIN_DIR ); 780 $mu_plugin_dir = wp_normalize_path( WPMU_PLUGIN_DIR ); 781 782 // Get relative path from plugins directory. 783 $file = preg_replace( '#^' . preg_quote( $plugin_dir, '#' ) . '/|^' . preg_quote( $mu_plugin_dir, '#' ) . '/#', '', $file ); 784 $file = trim( $file, '/' ); 785 return $file; 786 } 787 788 /** 789 * Register a plugin's real path. 790 * 791 * This is used in plugin_basename() to resolve symlinked paths. 792 * 793 * @since 3.9.0 794 * 795 * @see wp_normalize_path() 796 * 797 * @global array $wp_plugin_paths 798 * 799 * @param string $file Known path to the file. 800 * @return bool Whether the path was able to be registered. 801 */ 802 function wp_register_plugin_realpath( $file ) { 803 global $wp_plugin_paths; 804 805 // Normalize, but store as static to avoid recalculation of a constant value. 806 static $wp_plugin_path = null, $wpmu_plugin_path = null; 807 808 if ( ! isset( $wp_plugin_path ) ) { 809 $wp_plugin_path = wp_normalize_path( WP_PLUGIN_DIR ); 810 $wpmu_plugin_path = wp_normalize_path( WPMU_PLUGIN_DIR ); 811 } 812 813 $plugin_path = wp_normalize_path( dirname( $file ) ); 814 $plugin_realpath = wp_normalize_path( dirname( realpath( $file ) ) ); 815 816 if ( $plugin_path === $wp_plugin_path || $plugin_path === $wpmu_plugin_path ) { 817 return false; 818 } 819 820 if ( $plugin_path !== $plugin_realpath ) { 821 $wp_plugin_paths[ $plugin_path ] = $plugin_realpath; 822 } 823 824 return true; 825 } 826 827 /** 828 * Get the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in. 829 * 830 * @since 2.8.0 831 * 832 * @param string $file The filename of the plugin (__FILE__). 833 * @return string the filesystem path of the directory that contains the plugin. 834 */ 835 function plugin_dir_path( $file ) { 836 return trailingslashit( dirname( $file ) ); 837 } 838 839 /** 840 * Get the URL directory path (with trailing slash) for the plugin __FILE__ passed in. 841 * 842 * @since 2.8.0 843 * 844 * @param string $file The filename of the plugin (__FILE__). 845 * @return string the URL path of the directory that contains the plugin. 846 */ 847 function plugin_dir_url( $file ) { 848 return trailingslashit( plugins_url( '', $file ) ); 849 } 850 851 /** 852 * Set the activation hook for a plugin. 853 * 854 * When a plugin is activated, the action 'activate_PLUGINNAME' hook is 855 * called. In the name of this hook, PLUGINNAME is replaced with the name 856 * of the plugin, including the optional subdirectory. For example, when the 857 * plugin is located in wp-content/plugins/sampleplugin/sample.php, then 858 * the name of this hook will become 'activate_sampleplugin/sample.php'. 859 * 860 * When the plugin consists of only one file and is (as by default) located at 861 * wp-content/plugins/sample.php the name of this hook will be 862 * 'activate_sample.php'. 863 * 864 * @since 2.0.0 865 * 866 * @param string $file The filename of the plugin including the path. 867 * @param callable $callback The function hooked to the 'activate_PLUGIN' action. 868 */ 869 function register_activation_hook( $file, $callback ) { 870 $file = plugin_basename( $file ); 871 add_action( 'activate_' . $file, $callback ); 872 } 873 874 /** 875 * Sets the deactivation hook for a plugin. 876 * 877 * When a plugin is deactivated, the action 'deactivate_PLUGINNAME' hook is 878 * called. In the name of this hook, PLUGINNAME is replaced with the name 879 * of the plugin, including the optional subdirectory. For example, when the 880 * plugin is located in wp-content/plugins/sampleplugin/sample.php, then 881 * the name of this hook will become 'deactivate_sampleplugin/sample.php'. 882 * 883 * When the plugin consists of only one file and is (as by default) located at 884 * wp-content/plugins/sample.php the name of this hook will be 885 * 'deactivate_sample.php'. 886 * 887 * @since 2.0.0 888 * 889 * @param string $file The filename of the plugin including the path. 890 * @param callable $callback The function hooked to the 'deactivate_PLUGIN' action. 891 */ 892 function register_deactivation_hook( $file, $callback ) { 893 $file = plugin_basename( $file ); 894 add_action( 'deactivate_' . $file, $callback ); 895 } 896 897 /** 898 * Sets the uninstallation hook for a plugin. 899 * 900 * Registers the uninstall hook that will be called when the user clicks on the 901 * uninstall link that calls for the plugin to uninstall itself. The link won't 902 * be active unless the plugin hooks into the action. 903 * 904 * The plugin should not run arbitrary code outside of functions, when 905 * registering the uninstall hook. In order to run using the hook, the plugin 906 * will have to be included, which means that any code laying outside of a 907 * function will be run during the uninstallation process. The plugin should not 908 * hinder the uninstallation process. 909 * 910 * If the plugin can not be written without running code within the plugin, then 911 * the plugin should create a file named 'uninstall.php' in the base plugin 912 * folder. This file will be called, if it exists, during the uninstallation process 913 * bypassing the uninstall hook. The plugin, when using the 'uninstall.php' 914 * should always check for the 'WP_UNINSTALL_PLUGIN' constant, before 915 * executing. 916 * 917 * @since 2.7.0 918 * 919 * @param string $file Plugin file. 920 * @param callable $callback The callback to run when the hook is called. Must be 921 * a static method or function. 922 */ 923 function register_uninstall_hook( $file, $callback ) { 924 if ( is_array( $callback ) && is_object( $callback[0] ) ) { 925 _doing_it_wrong( __FUNCTION__, __( 'Only a static class method or function can be used in an uninstall hook.' ), '3.1.0' ); 926 return; 927 } 928 929 /* 930 * The option should not be autoloaded, because it is not needed in most 931 * cases. Emphasis should be put on using the 'uninstall.php' way of 932 * uninstalling the plugin. 933 */ 934 $uninstallable_plugins = (array) get_option( 'uninstall_plugins' ); 935 $plugin_basename = plugin_basename( $file ); 936 937 if ( ! isset( $uninstallable_plugins[ $plugin_basename ] ) || $uninstallable_plugins[ $plugin_basename ] !== $callback ) { 938 $uninstallable_plugins[ $plugin_basename ] = $callback; 939 update_option( 'uninstall_plugins', $uninstallable_plugins ); 940 } 941 } 942 943 /** 944 * Calls the 'all' hook, which will process the functions hooked into it. 945 * 946 * The 'all' hook passes all of the arguments or parameters that were used for 947 * the hook, which this function was called for. 948 * 949 * This function is used internally for apply_filters(), do_action(), and 950 * do_action_ref_array() and is not meant to be used from outside those 951 * functions. This function does not check for the existence of the all hook, so 952 * it will fail unless the all hook exists prior to this function call. 953 * 954 * @since 2.5.0 955 * @access private 956 * 957 * @global WP_Hook[] $wp_filter Stores all of the filters and actions. 958 * 959 * @param array $args The collected parameters from the hook that was called. 960 */ 961 function _wp_call_all_hook( $args ) { 962 global $wp_filter; 963 964 $wp_filter['all']->do_all_hook( $args ); 965 } 966 967 /** 968 * Builds a unique string ID for a hook callback function. 969 * 970 * Functions and static method callbacks are just returned as strings and 971 * shouldn't have any speed penalty. 972 * 973 * @link https://core.trac.wordpress.org/ticket/3875 974 * 975 * @since 2.2.3 976 * @since 5.3.0 Removed workarounds for spl_object_hash(). 977 * `$hook_name` and `$priority` are no longer used, 978 * and the function always returns a string. 979 * 980 * @access private 981 * 982 * @param string $hook_name Unused. The name of the filter to build ID for. 983 * @param callable|string|array $callback The callback to generate ID for. The callback may 984 * or may not exist. 985 * @param int $priority Unused. The order in which the functions 986 * associated with a particular action are executed. 987 * @return string Unique function ID for usage as array key. 988 */ 989 function _wp_filter_build_unique_id( $hook_name, $callback, $priority ) { 990 if ( is_string( $callback ) ) { 991 return $callback; 992 } 993 994 if ( is_object( $callback ) ) { 995 // Closures are currently implemented as objects. 996 $callback = array( $callback, '' ); 997 } else { 998 $callback = (array) $callback; 999 } 1000 1001 if ( is_object( $callback[0] ) ) { 1002 // Object class calling. 1003 return spl_object_hash( $callback[0] ) . $callback[1]; 1004 } elseif ( is_string( $callback[0] ) ) { 1005 // Static calling. 1006 return $callback[0] . '::' . $callback[1]; 1007 } 1008 }
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