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1 <?php 2 /** 3 * WordPress Cron API 4 * 5 * @package WordPress 6 */ 7 8 /** 9 * Schedules an event to run only once. 10 * 11 * Schedules a hook which will be triggered by WordPress at the specified time. 12 * The action will trigger when someone visits your WordPress site if the scheduled 13 * time has passed. 14 * 15 * Note that scheduling an event to occur within 10 minutes of an existing event 16 * with the same action hook will be ignored unless you pass unique `$args` values 17 * for each scheduled event. 18 * 19 * Use wp_next_scheduled() to prevent duplicate events. 20 * 21 * Use wp_schedule_event() to schedule a recurring event. 22 * 23 * @since 2.1.0 24 * @since 5.1.0 Return value modified to boolean indicating success or failure, 25 * {@see 'pre_schedule_event'} filter added to short-circuit the function. 26 * 27 * @link https://developer.wordpress.org/reference/functions/wp_schedule_single_event/ 28 * 29 * @param int $timestamp Unix timestamp (UTC) for when to next run the event. 30 * @param string $hook Action hook to execute when the event is run. 31 * @param array $args Optional. Array containing each separate argument to pass to the hook's callback function. 32 * @return bool True if event successfully scheduled. False for failure. 33 */ 34 function wp_schedule_single_event( $timestamp, $hook, $args = array() ) { 35 // Make sure timestamp is a positive integer. 36 if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) { 37 return false; 38 } 39 40 $event = (object) array( 41 'hook' => $hook, 42 'timestamp' => $timestamp, 43 'schedule' => false, 44 'args' => $args, 45 ); 46 47 /** 48 * Filter to preflight or hijack scheduling an event. 49 * 50 * Returning a non-null value will short-circuit adding the event to the 51 * cron array, causing the function to return the filtered value instead. 52 * 53 * Both single events and recurring events are passed through this filter; 54 * single events have `$event->schedule` as false, whereas recurring events 55 * have this set to a recurrence from wp_get_schedules(). Recurring 56 * events also have the integer recurrence interval set as `$event->interval`. 57 * 58 * For plugins replacing wp-cron, it is recommended you check for an 59 * identical event within ten minutes and apply the {@see 'schedule_event'} 60 * filter to check if another plugin has disallowed the event before scheduling. 61 * 62 * Return true if the event was scheduled, false if not. 63 * 64 * @since 5.1.0 65 * 66 * @param null|bool $pre Value to return instead. Default null to continue adding the event. 67 * @param stdClass $event { 68 * An object containing an event's data. 69 * 70 * @type string $hook Action hook to execute when the event is run. 71 * @type int $timestamp Unix timestamp (UTC) for when to next run the event. 72 * @type string|false $schedule How often the event should subsequently recur. 73 * @type array $args Array containing each separate argument to pass to the hook's callback function. 74 * @type int $interval The interval time in seconds for the schedule. Only present for recurring events. 75 * } 76 */ 77 $pre = apply_filters( 'pre_schedule_event', null, $event ); 78 if ( null !== $pre ) { 79 return $pre; 80 } 81 82 /* 83 * Check for a duplicated event. 84 * 85 * Don't schedule an event if there's already an identical event 86 * within 10 minutes. 87 * 88 * When scheduling events within ten minutes of the current time, 89 * all past identical events are considered duplicates. 90 * 91 * When scheduling an event with a past timestamp (ie, before the 92 * current time) all events scheduled within the next ten minutes 93 * are considered duplicates. 94 */ 95 $crons = (array) _get_cron_array(); 96 $key = md5( serialize( $event->args ) ); 97 $duplicate = false; 98 99 if ( $event->timestamp < time() + 10 * MINUTE_IN_SECONDS ) { 100 $min_timestamp = 0; 101 } else { 102 $min_timestamp = $event->timestamp - 10 * MINUTE_IN_SECONDS; 103 } 104 105 if ( $event->timestamp < time() ) { 106 $max_timestamp = time() + 10 * MINUTE_IN_SECONDS; 107 } else { 108 $max_timestamp = $event->timestamp + 10 * MINUTE_IN_SECONDS; 109 } 110 111 foreach ( $crons as $event_timestamp => $cron ) { 112 if ( $event_timestamp < $min_timestamp ) { 113 continue; 114 } 115 if ( $event_timestamp > $max_timestamp ) { 116 break; 117 } 118 if ( isset( $cron[ $event->hook ][ $key ] ) ) { 119 $duplicate = true; 120 break; 121 } 122 } 123 124 if ( $duplicate ) { 125 return false; 126 } 127 128 /** 129 * Modify an event before it is scheduled. 130 * 131 * @since 3.1.0 132 * 133 * @param stdClass|false $event { 134 * An object containing an event's data, or boolean false to prevent the event from being scheduled. 135 * 136 * @type string $hook Action hook to execute when the event is run. 137 * @type int $timestamp Unix timestamp (UTC) for when to next run the event. 138 * @type string|false $schedule How often the event should subsequently recur. 139 * @type array $args Array containing each separate argument to pass to the hook's callback function. 140 * @type int $interval The interval time in seconds for the schedule. Only present for recurring events. 141 * } 142 */ 143 $event = apply_filters( 'schedule_event', $event ); 144 145 // A plugin disallowed this event. 146 if ( ! $event ) { 147 return false; 148 } 149 150 $crons[ $event->timestamp ][ $event->hook ][ $key ] = array( 151 'schedule' => $event->schedule, 152 'args' => $event->args, 153 ); 154 uksort( $crons, 'strnatcasecmp' ); 155 return _set_cron_array( $crons ); 156 } 157 158 /** 159 * Schedules a recurring event. 160 * 161 * Schedules a hook which will be triggered by WordPress at the specified interval. 162 * The action will trigger when someone visits your WordPress site if the scheduled 163 * time has passed. 164 * 165 * Valid values for the recurrence are 'hourly', 'daily', and 'twicedaily'. These can 166 * be extended using the {@see 'cron_schedules'} filter in wp_get_schedules(). 167 * 168 * Note that scheduling an event to occur within 10 minutes of an existing event 169 * with the same action hook will be ignored unless you pass unique `$args` values 170 * for each scheduled event. 171 * 172 * Use wp_next_scheduled() to prevent duplicate events. 173 * 174 * Use wp_schedule_single_event() to schedule a non-recurring event. 175 * 176 * @since 2.1.0 177 * @since 5.1.0 Return value modified to boolean indicating success or failure, 178 * {@see 'pre_schedule_event'} filter added to short-circuit the function. 179 * 180 * @link https://developer.wordpress.org/reference/functions/wp_schedule_event/ 181 * 182 * @param int $timestamp Unix timestamp (UTC) for when to next run the event. 183 * @param string $recurrence How often the event should subsequently recur. See wp_get_schedules() for accepted values. 184 * @param string $hook Action hook to execute when the event is run. 185 * @param array $args Optional. Array containing each separate argument to pass to the hook's callback function. 186 * @return bool True if event successfully scheduled. False for failure. 187 */ 188 function wp_schedule_event( $timestamp, $recurrence, $hook, $args = array() ) { 189 // Make sure timestamp is a positive integer. 190 if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) { 191 return false; 192 } 193 194 $schedules = wp_get_schedules(); 195 196 if ( ! isset( $schedules[ $recurrence ] ) ) { 197 return false; 198 } 199 200 $event = (object) array( 201 'hook' => $hook, 202 'timestamp' => $timestamp, 203 'schedule' => $recurrence, 204 'args' => $args, 205 'interval' => $schedules[ $recurrence ]['interval'], 206 ); 207 208 /** This filter is documented in wp-includes/cron.php */ 209 $pre = apply_filters( 'pre_schedule_event', null, $event ); 210 if ( null !== $pre ) { 211 return $pre; 212 } 213 214 /** This filter is documented in wp-includes/cron.php */ 215 $event = apply_filters( 'schedule_event', $event ); 216 217 // A plugin disallowed this event. 218 if ( ! $event ) { 219 return false; 220 } 221 222 $key = md5( serialize( $event->args ) ); 223 224 $crons = _get_cron_array(); 225 $crons[ $event->timestamp ][ $event->hook ][ $key ] = array( 226 'schedule' => $event->schedule, 227 'args' => $event->args, 228 'interval' => $event->interval, 229 ); 230 uksort( $crons, 'strnatcasecmp' ); 231 return _set_cron_array( $crons ); 232 } 233 234 /** 235 * Reschedules a recurring event. 236 * 237 * Mainly for internal use, this takes the time stamp of a previously run 238 * recurring event and reschedules it for its next run. 239 * 240 * To change upcoming scheduled events, use wp_schedule_event() to 241 * change the recurrence frequency. 242 * 243 * @since 2.1.0 244 * @since 5.1.0 Return value modified to boolean indicating success or failure, 245 * {@see 'pre_reschedule_event'} filter added to short-circuit the function. 246 * 247 * @param int $timestamp Unix timestamp (UTC) for when the event was scheduled. 248 * @param string $recurrence How often the event should subsequently recur. See wp_get_schedules() for accepted values. 249 * @param string $hook Action hook to execute when the event is run. 250 * @param array $args Optional. Array containing each separate argument to pass to the hook's callback function. 251 * @return bool True if event successfully rescheduled. False for failure. 252 */ 253 function wp_reschedule_event( $timestamp, $recurrence, $hook, $args = array() ) { 254 // Make sure timestamp is a positive integer. 255 if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) { 256 return false; 257 } 258 259 $schedules = wp_get_schedules(); 260 $interval = 0; 261 262 // First we try to get the interval from the schedule. 263 if ( isset( $schedules[ $recurrence ] ) ) { 264 $interval = $schedules[ $recurrence ]['interval']; 265 } 266 267 // Now we try to get it from the saved interval in case the schedule disappears. 268 if ( 0 === $interval ) { 269 $scheduled_event = wp_get_scheduled_event( $hook, $args, $timestamp ); 270 if ( $scheduled_event && isset( $scheduled_event->interval ) ) { 271 $interval = $scheduled_event->interval; 272 } 273 } 274 275 $event = (object) array( 276 'hook' => $hook, 277 'timestamp' => $timestamp, 278 'schedule' => $recurrence, 279 'args' => $args, 280 'interval' => $interval, 281 ); 282 283 /** 284 * Filter to preflight or hijack rescheduling of events. 285 * 286 * Returning a non-null value will short-circuit the normal rescheduling 287 * process, causing the function to return the filtered value instead. 288 * 289 * For plugins replacing wp-cron, return true if the event was successfully 290 * rescheduled, false if not. 291 * 292 * @since 5.1.0 293 * 294 * @param null|bool $pre Value to return instead. Default null to continue adding the event. 295 * @param stdClass $event { 296 * An object containing an event's data. 297 * 298 * @type string $hook Action hook to execute when the event is run. 299 * @type int $timestamp Unix timestamp (UTC) for when to next run the event. 300 * @type string|false $schedule How often the event should subsequently recur. 301 * @type array $args Array containing each separate argument to pass to the hook's callback function. 302 * @type int $interval The interval time in seconds for the schedule. Only present for recurring events. 303 * } 304 */ 305 $pre = apply_filters( 'pre_reschedule_event', null, $event ); 306 if ( null !== $pre ) { 307 return $pre; 308 } 309 310 // Now we assume something is wrong and fail to schedule. 311 if ( 0 == $interval ) { 312 return false; 313 } 314 315 $now = time(); 316 317 if ( $timestamp >= $now ) { 318 $timestamp = $now + $interval; 319 } else { 320 $timestamp = $now + ( $interval - ( ( $now - $timestamp ) % $interval ) ); 321 } 322 323 return wp_schedule_event( $timestamp, $recurrence, $hook, $args ); 324 } 325 326 /** 327 * Unschedule a previously scheduled event. 328 * 329 * The $timestamp and $hook parameters are required so that the event can be 330 * identified. 331 * 332 * @since 2.1.0 333 * @since 5.1.0 Return value modified to boolean indicating success or failure, 334 * {@see 'pre_unschedule_event'} filter added to short-circuit the function. 335 * 336 * @param int $timestamp Unix timestamp (UTC) of the event. 337 * @param string $hook Action hook of the event. 338 * @param array $args Optional. Array containing each separate argument to pass to the hook's callback function. 339 * Although not passed to a callback, these arguments are used to uniquely identify the 340 * event, so they should be the same as those used when originally scheduling the event. 341 * @return bool True if event successfully unscheduled. False for failure. 342 */ 343 function wp_unschedule_event( $timestamp, $hook, $args = array() ) { 344 // Make sure timestamp is a positive integer. 345 if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) { 346 return false; 347 } 348 349 /** 350 * Filter to preflight or hijack unscheduling of events. 351 * 352 * Returning a non-null value will short-circuit the normal unscheduling 353 * process, causing the function to return the filtered value instead. 354 * 355 * For plugins replacing wp-cron, return true if the event was successfully 356 * unscheduled, false if not. 357 * 358 * @since 5.1.0 359 * 360 * @param null|bool $pre Value to return instead. Default null to continue unscheduling the event. 361 * @param int $timestamp Timestamp for when to run the event. 362 * @param string $hook Action hook, the execution of which will be unscheduled. 363 * @param array $args Arguments to pass to the hook's callback function. 364 */ 365 $pre = apply_filters( 'pre_unschedule_event', null, $timestamp, $hook, $args ); 366 if ( null !== $pre ) { 367 return $pre; 368 } 369 370 $crons = _get_cron_array(); 371 $key = md5( serialize( $args ) ); 372 unset( $crons[ $timestamp ][ $hook ][ $key ] ); 373 if ( empty( $crons[ $timestamp ][ $hook ] ) ) { 374 unset( $crons[ $timestamp ][ $hook ] ); 375 } 376 if ( empty( $crons[ $timestamp ] ) ) { 377 unset( $crons[ $timestamp ] ); 378 } 379 return _set_cron_array( $crons ); 380 } 381 382 /** 383 * Unschedules all events attached to the hook with the specified arguments. 384 * 385 * Warning: This function may return Boolean FALSE, but may also return a non-Boolean 386 * value which evaluates to FALSE. For information about casting to booleans see the 387 * {@link https://www.php.net/manual/en/language.types.boolean.php PHP documentation}. Use 388 * the `===` operator for testing the return value of this function. 389 * 390 * @since 2.1.0 391 * @since 5.1.0 Return value modified to indicate success or failure, 392 * {@see 'pre_clear_scheduled_hook'} filter added to short-circuit the function. 393 * 394 * @param string $hook Action hook, the execution of which will be unscheduled. 395 * @param array $args Optional. Arguments that were to be passed to the hook's callback function. 396 * @return int|false On success an integer indicating number of events unscheduled (0 indicates no 397 * events were registered with the hook and arguments combination), false if 398 * unscheduling one or more events fail. 399 */ 400 function wp_clear_scheduled_hook( $hook, $args = array() ) { 401 // Backward compatibility. 402 // Previously, this function took the arguments as discrete vars rather than an array like the rest of the API. 403 if ( ! is_array( $args ) ) { 404 _deprecated_argument( __FUNCTION__, '3.0.0', __( 'This argument has changed to an array to match the behavior of the other cron functions.' ) ); 405 $args = array_slice( func_get_args(), 1 ); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection 406 } 407 408 /** 409 * Filter to preflight or hijack clearing a scheduled hook. 410 * 411 * Returning a non-null value will short-circuit the normal unscheduling 412 * process, causing the function to return the filtered value instead. 413 * 414 * For plugins replacing wp-cron, return the number of events successfully 415 * unscheduled (zero if no events were registered with the hook) or false 416 * if unscheduling one or more events fails. 417 * 418 * @since 5.1.0 419 * 420 * @param null|int|false $pre Value to return instead. Default null to continue unscheduling the event. 421 * @param string $hook Action hook, the execution of which will be unscheduled. 422 * @param array $args Arguments to pass to the hook's callback function. 423 */ 424 $pre = apply_filters( 'pre_clear_scheduled_hook', null, $hook, $args ); 425 if ( null !== $pre ) { 426 return $pre; 427 } 428 429 /* 430 * This logic duplicates wp_next_scheduled(). 431 * It's required due to a scenario where wp_unschedule_event() fails due to update_option() failing, 432 * and, wp_next_scheduled() returns the same schedule in an infinite loop. 433 */ 434 $crons = _get_cron_array(); 435 if ( empty( $crons ) ) { 436 return 0; 437 } 438 439 $results = array(); 440 $key = md5( serialize( $args ) ); 441 foreach ( $crons as $timestamp => $cron ) { 442 if ( isset( $cron[ $hook ][ $key ] ) ) { 443 $results[] = wp_unschedule_event( $timestamp, $hook, $args ); 444 } 445 } 446 if ( in_array( false, $results, true ) ) { 447 return false; 448 } 449 return count( $results ); 450 } 451 452 /** 453 * Unschedules all events attached to the hook. 454 * 455 * Can be useful for plugins when deactivating to clean up the cron queue. 456 * 457 * Warning: This function may return Boolean FALSE, but may also return a non-Boolean 458 * value which evaluates to FALSE. For information about casting to booleans see the 459 * {@link https://www.php.net/manual/en/language.types.boolean.php PHP documentation}. Use 460 * the `===` operator for testing the return value of this function. 461 * 462 * @since 4.9.0 463 * @since 5.1.0 Return value added to indicate success or failure. 464 * 465 * @param string $hook Action hook, the execution of which will be unscheduled. 466 * @return int|false On success an integer indicating number of events unscheduled (0 indicates no 467 * events were registered on the hook), false if unscheduling fails. 468 */ 469 function wp_unschedule_hook( $hook ) { 470 /** 471 * Filter to preflight or hijack clearing all events attached to the hook. 472 * 473 * Returning a non-null value will short-circuit the normal unscheduling 474 * process, causing the function to return the filtered value instead. 475 * 476 * For plugins replacing wp-cron, return the number of events successfully 477 * unscheduled (zero if no events were registered with the hook) or false 478 * if unscheduling one or more events fails. 479 * 480 * @since 5.1.0 481 * 482 * @param null|int|false $pre Value to return instead. Default null to continue unscheduling the hook. 483 * @param string $hook Action hook, the execution of which will be unscheduled. 484 */ 485 $pre = apply_filters( 'pre_unschedule_hook', null, $hook ); 486 if ( null !== $pre ) { 487 return $pre; 488 } 489 490 $crons = _get_cron_array(); 491 if ( empty( $crons ) ) { 492 return 0; 493 } 494 495 $results = array(); 496 foreach ( $crons as $timestamp => $args ) { 497 if ( ! empty( $crons[ $timestamp ][ $hook ] ) ) { 498 $results[] = count( $crons[ $timestamp ][ $hook ] ); 499 } 500 unset( $crons[ $timestamp ][ $hook ] ); 501 502 if ( empty( $crons[ $timestamp ] ) ) { 503 unset( $crons[ $timestamp ] ); 504 } 505 } 506 507 /* 508 * If the results are empty (zero events to unschedule), no attempt 509 * to update the cron array is required. 510 */ 511 if ( empty( $results ) ) { 512 return 0; 513 } 514 if ( _set_cron_array( $crons ) ) { 515 return array_sum( $results ); 516 } 517 return false; 518 } 519 520 /** 521 * Retrieve a scheduled event. 522 * 523 * Retrieve the full event object for a given event, if no timestamp is specified the next 524 * scheduled event is returned. 525 * 526 * @since 5.1.0 527 * 528 * @param string $hook Action hook of the event. 529 * @param array $args Optional. Array containing each separate argument to pass to the hook's callback function. 530 * Although not passed to a callback, these arguments are used to uniquely identify the 531 * event, so they should be the same as those used when originally scheduling the event. 532 * @param int|null $timestamp Optional. Unix timestamp (UTC) of the event. If not specified, the next scheduled event is returned. 533 * @return object|false The event object. False if the event does not exist. 534 */ 535 function wp_get_scheduled_event( $hook, $args = array(), $timestamp = null ) { 536 /** 537 * Filter to preflight or hijack retrieving a scheduled event. 538 * 539 * Returning a non-null value will short-circuit the normal process, 540 * returning the filtered value instead. 541 * 542 * Return false if the event does not exist, otherwise an event object 543 * should be returned. 544 * 545 * @since 5.1.0 546 * 547 * @param null|false|object $pre Value to return instead. Default null to continue retrieving the event. 548 * @param string $hook Action hook of the event. 549 * @param array $args Array containing each separate argument to pass to the hook's callback function. 550 * Although not passed to a callback, these arguments are used to uniquely identify 551 * the event. 552 * @param int|null $timestamp Unix timestamp (UTC) of the event. Null to retrieve next scheduled event. 553 */ 554 $pre = apply_filters( 'pre_get_scheduled_event', null, $hook, $args, $timestamp ); 555 if ( null !== $pre ) { 556 return $pre; 557 } 558 559 if ( null !== $timestamp && ! is_numeric( $timestamp ) ) { 560 return false; 561 } 562 563 $crons = _get_cron_array(); 564 if ( empty( $crons ) ) { 565 return false; 566 } 567 568 $key = md5( serialize( $args ) ); 569 570 if ( ! $timestamp ) { 571 // Get next event. 572 $next = false; 573 foreach ( $crons as $timestamp => $cron ) { 574 if ( isset( $cron[ $hook ][ $key ] ) ) { 575 $next = $timestamp; 576 break; 577 } 578 } 579 if ( ! $next ) { 580 return false; 581 } 582 583 $timestamp = $next; 584 } elseif ( ! isset( $crons[ $timestamp ][ $hook ][ $key ] ) ) { 585 return false; 586 } 587 588 $event = (object) array( 589 'hook' => $hook, 590 'timestamp' => $timestamp, 591 'schedule' => $crons[ $timestamp ][ $hook ][ $key ]['schedule'], 592 'args' => $args, 593 ); 594 595 if ( isset( $crons[ $timestamp ][ $hook ][ $key ]['interval'] ) ) { 596 $event->interval = $crons[ $timestamp ][ $hook ][ $key ]['interval']; 597 } 598 599 return $event; 600 } 601 602 /** 603 * Retrieve the next timestamp for an event. 604 * 605 * @since 2.1.0 606 * 607 * @param string $hook Action hook of the event. 608 * @param array $args Optional. Array containing each separate argument to pass to the hook's callback function. 609 * Although not passed to a callback, these arguments are used to uniquely identify the 610 * event, so they should be the same as those used when originally scheduling the event. 611 * @return int|false The Unix timestamp of the next time the event will occur. False if the event doesn't exist. 612 */ 613 function wp_next_scheduled( $hook, $args = array() ) { 614 $next_event = wp_get_scheduled_event( $hook, $args ); 615 if ( ! $next_event ) { 616 return false; 617 } 618 619 return $next_event->timestamp; 620 } 621 622 /** 623 * Sends a request to run cron through HTTP request that doesn't halt page loading. 624 * 625 * @since 2.1.0 626 * @since 5.1.0 Return values added. 627 * 628 * @param int $gmt_time Optional. Unix timestamp (UTC). Default 0 (current time is used). 629 * @return bool True if spawned, false if no events spawned. 630 */ 631 function spawn_cron( $gmt_time = 0 ) { 632 if ( ! $gmt_time ) { 633 $gmt_time = microtime( true ); 634 } 635 636 if ( defined( 'DOING_CRON' ) || isset( $_GET['doing_wp_cron'] ) ) { 637 return false; 638 } 639 640 /* 641 * Get the cron lock, which is a Unix timestamp of when the last cron was spawned 642 * and has not finished running. 643 * 644 * Multiple processes on multiple web servers can run this code concurrently, 645 * this lock attempts to make spawning as atomic as possible. 646 */ 647 $lock = get_transient( 'doing_cron' ); 648 649 if ( $lock > $gmt_time + 10 * MINUTE_IN_SECONDS ) { 650 $lock = 0; 651 } 652 653 // Don't run if another process is currently running it or more than once every 60 sec. 654 if ( $lock + WP_CRON_LOCK_TIMEOUT > $gmt_time ) { 655 return false; 656 } 657 658 // Sanity check. 659 $crons = wp_get_ready_cron_jobs(); 660 if ( empty( $crons ) ) { 661 return false; 662 } 663 664 $keys = array_keys( $crons ); 665 if ( isset( $keys[0] ) && $keys[0] > $gmt_time ) { 666 return false; 667 } 668 669 if ( defined( 'ALTERNATE_WP_CRON' ) && ALTERNATE_WP_CRON ) { 670 if ( 'GET' !== $_SERVER['REQUEST_METHOD'] || defined( 'DOING_AJAX' ) || defined( 'XMLRPC_REQUEST' ) ) { 671 return false; 672 } 673 674 $doing_wp_cron = sprintf( '%.22F', $gmt_time ); 675 set_transient( 'doing_cron', $doing_wp_cron ); 676 677 ob_start(); 678 wp_redirect( add_query_arg( 'doing_wp_cron', $doing_wp_cron, wp_unslash( $_SERVER['REQUEST_URI'] ) ) ); 679 echo ' '; 680 681 // Flush any buffers and send the headers. 682 wp_ob_end_flush_all(); 683 flush(); 684 685 include_once ABSPATH . 'wp-cron.php'; 686 return true; 687 } 688 689 // Set the cron lock with the current unix timestamp, when the cron is being spawned. 690 $doing_wp_cron = sprintf( '%.22F', $gmt_time ); 691 set_transient( 'doing_cron', $doing_wp_cron ); 692 693 /** 694 * Filters the cron request arguments. 695 * 696 * @since 3.5.0 697 * @since 4.5.0 The `$doing_wp_cron` parameter was added. 698 * 699 * @param array $cron_request_array { 700 * An array of cron request URL arguments. 701 * 702 * @type string $url The cron request URL. 703 * @type int $key The 22 digit GMT microtime. 704 * @type array $args { 705 * An array of cron request arguments. 706 * 707 * @type int $timeout The request timeout in seconds. Default .01 seconds. 708 * @type bool $blocking Whether to set blocking for the request. Default false. 709 * @type bool $sslverify Whether SSL should be verified for the request. Default false. 710 * } 711 * } 712 * @param string $doing_wp_cron The unix timestamp of the cron lock. 713 */ 714 $cron_request = apply_filters( 715 'cron_request', 716 array( 717 'url' => add_query_arg( 'doing_wp_cron', $doing_wp_cron, site_url( 'wp-cron.php' ) ), 718 'key' => $doing_wp_cron, 719 'args' => array( 720 'timeout' => 0.01, 721 'blocking' => false, 722 /** This filter is documented in wp-includes/class-wp-http-streams.php */ 723 'sslverify' => apply_filters( 'https_local_ssl_verify', false ), 724 ), 725 ), 726 $doing_wp_cron 727 ); 728 729 $result = wp_remote_post( $cron_request['url'], $cron_request['args'] ); 730 return ! is_wp_error( $result ); 731 } 732 733 /** 734 * Run scheduled callbacks or spawn cron for all scheduled events. 735 * 736 * Warning: This function may return Boolean FALSE, but may also return a non-Boolean 737 * value which evaluates to FALSE. For information about casting to booleans see the 738 * {@link https://www.php.net/manual/en/language.types.boolean.php PHP documentation}. Use 739 * the `===` operator for testing the return value of this function. 740 * 741 * @since 2.1.0 742 * @since 5.1.0 Return value added to indicate success or failure. 743 * 744 * @return bool|int On success an integer indicating number of events spawned (0 indicates no 745 * events needed to be spawned), false if spawning fails for one or more events. 746 */ 747 function wp_cron() { 748 // Prevent infinite loops caused by lack of wp-cron.php. 749 if ( strpos( $_SERVER['REQUEST_URI'], '/wp-cron.php' ) !== false || ( defined( 'DISABLE_WP_CRON' ) && DISABLE_WP_CRON ) ) { 750 return 0; 751 } 752 753 $crons = wp_get_ready_cron_jobs(); 754 if ( empty( $crons ) ) { 755 return 0; 756 } 757 758 $gmt_time = microtime( true ); 759 $keys = array_keys( $crons ); 760 if ( isset( $keys[0] ) && $keys[0] > $gmt_time ) { 761 return 0; 762 } 763 764 $schedules = wp_get_schedules(); 765 $results = array(); 766 foreach ( $crons as $timestamp => $cronhooks ) { 767 if ( $timestamp > $gmt_time ) { 768 break; 769 } 770 foreach ( (array) $cronhooks as $hook => $args ) { 771 if ( isset( $schedules[ $hook ]['callback'] ) && ! call_user_func( $schedules[ $hook ]['callback'] ) ) { 772 continue; 773 } 774 $results[] = spawn_cron( $gmt_time ); 775 break 2; 776 } 777 } 778 779 if ( in_array( false, $results, true ) ) { 780 return false; 781 } 782 return count( $results ); 783 } 784 785 /** 786 * Retrieve supported event recurrence schedules. 787 * 788 * The default supported recurrences are 'hourly', 'twicedaily', 'daily', and 'weekly'. 789 * A plugin may add more by hooking into the {@see 'cron_schedules'} filter. 790 * The filter accepts an array of arrays. The outer array has a key that is the name 791 * of the schedule, for example 'monthly'. The value is an array with two keys, 792 * one is 'interval' and the other is 'display'. 793 * 794 * The 'interval' is a number in seconds of when the cron job should run. 795 * So for 'hourly' the time is `HOUR_IN_SECONDS` (60 * 60 or 3600). For 'monthly', 796 * the value would be `MONTH_IN_SECONDS` (30 * 24 * 60 * 60 or 2592000). 797 * 798 * The 'display' is the description. For the 'monthly' key, the 'display' 799 * would be `__( 'Once Monthly' )`. 800 * 801 * For your plugin, you will be passed an array. You can easily add your 802 * schedule by doing the following. 803 * 804 * // Filter parameter variable name is 'array'. 805 * $array['monthly'] = array( 806 * 'interval' => MONTH_IN_SECONDS, 807 * 'display' => __( 'Once Monthly' ) 808 * ); 809 * 810 * @since 2.1.0 811 * @since 5.4.0 The 'weekly' schedule was added. 812 * 813 * @return array 814 */ 815 function wp_get_schedules() { 816 $schedules = array( 817 'hourly' => array( 818 'interval' => HOUR_IN_SECONDS, 819 'display' => __( 'Once Hourly' ), 820 ), 821 'twicedaily' => array( 822 'interval' => 12 * HOUR_IN_SECONDS, 823 'display' => __( 'Twice Daily' ), 824 ), 825 'daily' => array( 826 'interval' => DAY_IN_SECONDS, 827 'display' => __( 'Once Daily' ), 828 ), 829 'weekly' => array( 830 'interval' => WEEK_IN_SECONDS, 831 'display' => __( 'Once Weekly' ), 832 ), 833 ); 834 835 /** 836 * Filters the non-default cron schedules. 837 * 838 * @since 2.1.0 839 * 840 * @param array $new_schedules An array of non-default cron schedules. Default empty. 841 */ 842 return array_merge( apply_filters( 'cron_schedules', array() ), $schedules ); 843 } 844 845 /** 846 * Retrieve the recurrence schedule for an event. 847 * 848 * @see wp_get_schedules() for available schedules. 849 * 850 * @since 2.1.0 851 * @since 5.1.0 {@see 'get_schedule'} filter added. 852 * 853 * @param string $hook Action hook to identify the event. 854 * @param array $args Optional. Arguments passed to the event's callback function. 855 * @return string|false False, if no schedule. Schedule name on success. 856 */ 857 function wp_get_schedule( $hook, $args = array() ) { 858 $schedule = false; 859 $event = wp_get_scheduled_event( $hook, $args ); 860 861 if ( $event ) { 862 $schedule = $event->schedule; 863 } 864 865 /** 866 * Filter the schedule for a hook. 867 * 868 * @since 5.1.0 869 * 870 * @param string|bool $schedule Schedule for the hook. False if not found. 871 * @param string $hook Action hook to execute when cron is run. 872 * @param array $args Optional. Arguments to pass to the hook's callback function. 873 */ 874 return apply_filters( 'get_schedule', $schedule, $hook, $args ); 875 } 876 877 /** 878 * Retrieve cron jobs ready to be run. 879 * 880 * Returns the results of _get_cron_array() limited to events ready to be run, 881 * ie, with a timestamp in the past. 882 * 883 * @since 5.1.0 884 * 885 * @return array Cron jobs ready to be run. 886 */ 887 function wp_get_ready_cron_jobs() { 888 /** 889 * Filter to preflight or hijack retrieving ready cron jobs. 890 * 891 * Returning an array will short-circuit the normal retrieval of ready 892 * cron jobs, causing the function to return the filtered value instead. 893 * 894 * @since 5.1.0 895 * 896 * @param null|array $pre Array of ready cron tasks to return instead. Default null 897 * to continue using results from _get_cron_array(). 898 */ 899 $pre = apply_filters( 'pre_get_ready_cron_jobs', null ); 900 if ( null !== $pre ) { 901 return $pre; 902 } 903 904 $crons = _get_cron_array(); 905 906 if ( false === $crons ) { 907 return array(); 908 } 909 910 $gmt_time = microtime( true ); 911 $keys = array_keys( $crons ); 912 if ( isset( $keys[0] ) && $keys[0] > $gmt_time ) { 913 return array(); 914 } 915 916 $results = array(); 917 foreach ( $crons as $timestamp => $cronhooks ) { 918 if ( $timestamp > $gmt_time ) { 919 break; 920 } 921 $results[ $timestamp ] = $cronhooks; 922 } 923 924 return $results; 925 } 926 927 // 928 // Private functions. 929 // 930 931 /** 932 * Retrieve cron info array option. 933 * 934 * @since 2.1.0 935 * @access private 936 * 937 * @return array|false CRON info array. 938 */ 939 function _get_cron_array() { 940 $cron = get_option( 'cron' ); 941 if ( ! is_array( $cron ) ) { 942 return false; 943 } 944 945 if ( ! isset( $cron['version'] ) ) { 946 $cron = _upgrade_cron_array( $cron ); 947 } 948 949 unset( $cron['version'] ); 950 951 return $cron; 952 } 953 954 /** 955 * Updates the CRON option with the new CRON array. 956 * 957 * @since 2.1.0 958 * @since 5.1.0 Return value modified to outcome of update_option(). 959 * 960 * @access private 961 * 962 * @param array $cron Cron info array from _get_cron_array(). 963 * @return bool True if cron array updated, false on failure. 964 */ 965 function _set_cron_array( $cron ) { 966 $cron['version'] = 2; 967 return update_option( 'cron', $cron ); 968 } 969 970 /** 971 * Upgrade a Cron info array. 972 * 973 * This function upgrades the Cron info array to version 2. 974 * 975 * @since 2.1.0 976 * @access private 977 * 978 * @param array $cron Cron info array from _get_cron_array(). 979 * @return array An upgraded Cron info array. 980 */ 981 function _upgrade_cron_array( $cron ) { 982 if ( isset( $cron['version'] ) && 2 == $cron['version'] ) { 983 return $cron; 984 } 985 986 $new_cron = array(); 987 988 foreach ( (array) $cron as $timestamp => $hooks ) { 989 foreach ( (array) $hooks as $hook => $args ) { 990 $key = md5( serialize( $args['args'] ) ); 991 $new_cron[ $timestamp ][ $hook ][ $key ] = $args; 992 } 993 } 994 995 $new_cron['version'] = 2; 996 update_option( 'cron', $new_cron ); 997 return $new_cron; 998 }
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