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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 $event { 134 * An object containing an event's data. 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://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 bool|int 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 ); 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|array $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 // This logic duplicates wp_next_scheduled() 430 // It's required due to a scenario where wp_unschedule_event() fails due to update_option() failing, 431 // and, wp_next_scheduled() returns the same schedule in an infinite loop. 432 $crons = _get_cron_array(); 433 if ( empty( $crons ) ) { 434 return 0; 435 } 436 437 $results = array(); 438 $key = md5( serialize( $args ) ); 439 foreach ( $crons as $timestamp => $cron ) { 440 if ( isset( $cron[ $hook ][ $key ] ) ) { 441 $results[] = wp_unschedule_event( $timestamp, $hook, $args ); 442 } 443 } 444 if ( in_array( false, $results, true ) ) { 445 return false; 446 } 447 return count( $results ); 448 } 449 450 /** 451 * Unschedules all events attached to the hook. 452 * 453 * Can be useful for plugins when deactivating to clean up the cron queue. 454 * 455 * Warning: This function may return Boolean FALSE, but may also return a non-Boolean 456 * value which evaluates to FALSE. For information about casting to booleans see the 457 * {@link https://php.net/manual/en/language.types.boolean.php PHP documentation}. Use 458 * the `===` operator for testing the return value of this function. 459 * 460 * @since 4.9.0 461 * @since 5.1.0 Return value added to indicate success or failure. 462 * 463 * @param string $hook Action hook, the execution of which will be unscheduled. 464 * @return bool|int On success an integer indicating number of events unscheduled (0 indicates no 465 * events were registered on the hook), false if unscheduling fails. 466 */ 467 function wp_unschedule_hook( $hook ) { 468 /** 469 * Filter to preflight or hijack clearing all events attached to the hook. 470 * 471 * Returning a non-null value will short-circuit the normal unscheduling 472 * process, causing the function to return the filtered value instead. 473 * 474 * For plugins replacing wp-cron, return the number of events successfully 475 * unscheduled (zero if no events were registered with the hook) or false 476 * if unscheduling one or more events fails. 477 * 478 * @since 5.1.0 479 * 480 * @param null|array $pre Value to return instead. Default null to continue unscheduling the hook. 481 * @param string $hook Action hook, the execution of which will be unscheduled. 482 */ 483 $pre = apply_filters( 'pre_unschedule_hook', null, $hook ); 484 if ( null !== $pre ) { 485 return $pre; 486 } 487 488 $crons = _get_cron_array(); 489 if ( empty( $crons ) ) { 490 return 0; 491 } 492 493 $results = array(); 494 foreach ( $crons as $timestamp => $args ) { 495 if ( ! empty( $crons[ $timestamp ][ $hook ] ) ) { 496 $results[] = count( $crons[ $timestamp ][ $hook ] ); 497 } 498 unset( $crons[ $timestamp ][ $hook ] ); 499 500 if ( empty( $crons[ $timestamp ] ) ) { 501 unset( $crons[ $timestamp ] ); 502 } 503 } 504 505 /* 506 * If the results are empty (zero events to unschedule), no attempt 507 * to update the cron array is required. 508 */ 509 if ( empty( $results ) ) { 510 return 0; 511 } 512 if ( _set_cron_array( $crons ) ) { 513 return array_sum( $results ); 514 } 515 return false; 516 } 517 518 /** 519 * Retrieve a scheduled event. 520 * 521 * Retrieve the full event object for a given event, if no timestamp is specified the next 522 * scheduled event is returned. 523 * 524 * @since 5.1.0 525 * 526 * @param string $hook Action hook of the event. 527 * @param array $args Optional. Array containing each separate argument to pass to the hook's callback function. 528 * Although not passed to a callback, these arguments are used to uniquely identify the 529 * event, so they should be the same as those used when originally scheduling the event. 530 * @param int|null $timestamp Optional. Unix timestamp (UTC) of the event. If not specified, the next scheduled event is returned. 531 * @return bool|object The event object. False if the event does not exist. 532 */ 533 function wp_get_scheduled_event( $hook, $args = array(), $timestamp = null ) { 534 /** 535 * Filter to preflight or hijack retrieving a scheduled event. 536 * 537 * Returning a non-null value will short-circuit the normal process, 538 * returning the filtered value instead. 539 * 540 * Return false if the event does not exist, otherwise an event object 541 * should be returned. 542 * 543 * @since 5.1.0 544 * 545 * @param null|bool $pre Value to return instead. Default null to continue retrieving the event. 546 * @param string $hook Action hook of the event. 547 * @param array $args Array containing each separate argument to pass to the hook's callback function. 548 * Although not passed to a callback, these arguments are used to uniquely identify the 549 * event. 550 * @param int|null $timestamp Unix timestamp (UTC) of the event. Null to retrieve next scheduled event. 551 */ 552 $pre = apply_filters( 'pre_get_scheduled_event', null, $hook, $args, $timestamp ); 553 if ( null !== $pre ) { 554 return $pre; 555 } 556 557 if ( null !== $timestamp && ! is_numeric( $timestamp ) ) { 558 return false; 559 } 560 561 $crons = _get_cron_array(); 562 if ( empty( $crons ) ) { 563 return false; 564 } 565 566 $key = md5( serialize( $args ) ); 567 568 if ( ! $timestamp ) { 569 // Get next event. 570 $next = false; 571 foreach ( $crons as $timestamp => $cron ) { 572 if ( isset( $cron[ $hook ][ $key ] ) ) { 573 $next = $timestamp; 574 break; 575 } 576 } 577 if ( ! $next ) { 578 return false; 579 } 580 581 $timestamp = $next; 582 } elseif ( ! isset( $crons[ $timestamp ][ $hook ][ $key ] ) ) { 583 return false; 584 } 585 586 $event = (object) array( 587 'hook' => $hook, 588 'timestamp' => $timestamp, 589 'schedule' => $crons[ $timestamp ][ $hook ][ $key ]['schedule'], 590 'args' => $args, 591 ); 592 593 if ( isset( $crons[ $timestamp ][ $hook ][ $key ]['interval'] ) ) { 594 $event->interval = $crons[ $timestamp ][ $hook ][ $key ]['interval']; 595 } 596 597 return $event; 598 } 599 600 /** 601 * Retrieve the next timestamp for an event. 602 * 603 * @since 2.1.0 604 * 605 * @param string $hook Action hook of the event. 606 * @param array $args Optional. Array containing each separate argument to pass to the hook's callback function. 607 * Although not passed to a callback, these arguments are used to uniquely identify the 608 * event, so they should be the same as those used when originally scheduling the event. 609 * @return false|int The Unix timestamp of the next time the event will occur. False if the event doesn't exist. 610 */ 611 function wp_next_scheduled( $hook, $args = array() ) { 612 $next_event = wp_get_scheduled_event( $hook, $args ); 613 if ( ! $next_event ) { 614 return false; 615 } 616 617 return $next_event->timestamp; 618 } 619 620 /** 621 * Sends a request to run cron through HTTP request that doesn't halt page loading. 622 * 623 * @since 2.1.0 624 * @since 5.1.0 Return values added. 625 * 626 * @param int $gmt_time Optional. Unix timestamp (UTC). Default 0 (current time is used). 627 * @return bool True if spawned, false if no events spawned. 628 */ 629 function spawn_cron( $gmt_time = 0 ) { 630 if ( ! $gmt_time ) { 631 $gmt_time = microtime( true ); 632 } 633 634 if ( defined( 'DOING_CRON' ) || isset( $_GET['doing_wp_cron'] ) ) { 635 return false; 636 } 637 638 /* 639 * Get the cron lock, which is a Unix timestamp of when the last cron was spawned 640 * and has not finished running. 641 * 642 * Multiple processes on multiple web servers can run this code concurrently, 643 * this lock attempts to make spawning as atomic as possible. 644 */ 645 $lock = get_transient( 'doing_cron' ); 646 647 if ( $lock > $gmt_time + 10 * MINUTE_IN_SECONDS ) { 648 $lock = 0; 649 } 650 651 // don't run if another process is currently running it or more than once every 60 sec. 652 if ( $lock + WP_CRON_LOCK_TIMEOUT > $gmt_time ) { 653 return false; 654 } 655 656 //sanity check 657 $crons = wp_get_ready_cron_jobs(); 658 if ( empty( $crons ) ) { 659 return false; 660 } 661 662 $keys = array_keys( $crons ); 663 if ( isset( $keys[0] ) && $keys[0] > $gmt_time ) { 664 return false; 665 } 666 667 if ( defined( 'ALTERNATE_WP_CRON' ) && ALTERNATE_WP_CRON ) { 668 if ( 'GET' !== $_SERVER['REQUEST_METHOD'] || defined( 'DOING_AJAX' ) || defined( 'XMLRPC_REQUEST' ) ) { 669 return false; 670 } 671 672 $doing_wp_cron = sprintf( '%.22F', $gmt_time ); 673 set_transient( 'doing_cron', $doing_wp_cron ); 674 675 ob_start(); 676 wp_redirect( add_query_arg( 'doing_wp_cron', $doing_wp_cron, wp_unslash( $_SERVER['REQUEST_URI'] ) ) ); 677 echo ' '; 678 679 // flush any buffers and send the headers 680 wp_ob_end_flush_all(); 681 flush(); 682 683 include_once( ABSPATH . 'wp-cron.php' ); 684 return true; 685 } 686 687 // Set the cron lock with the current unix timestamp, when the cron is being spawned. 688 $doing_wp_cron = sprintf( '%.22F', $gmt_time ); 689 set_transient( 'doing_cron', $doing_wp_cron ); 690 691 /** 692 * Filters the cron request arguments. 693 * 694 * @since 3.5.0 695 * @since 4.5.0 The `$doing_wp_cron` parameter was added. 696 * 697 * @param array $cron_request_array { 698 * An array of cron request URL arguments. 699 * 700 * @type string $url The cron request URL. 701 * @type int $key The 22 digit GMT microtime. 702 * @type array $args { 703 * An array of cron request arguments. 704 * 705 * @type int $timeout The request timeout in seconds. Default .01 seconds. 706 * @type bool $blocking Whether to set blocking for the request. Default false. 707 * @type bool $sslverify Whether SSL should be verified for the request. Default false. 708 * } 709 * } 710 * @param string $doing_wp_cron The unix timestamp of the cron lock. 711 */ 712 $cron_request = apply_filters( 713 'cron_request', 714 array( 715 'url' => add_query_arg( 'doing_wp_cron', $doing_wp_cron, site_url( 'wp-cron.php' ) ), 716 'key' => $doing_wp_cron, 717 'args' => array( 718 'timeout' => 0.01, 719 'blocking' => false, 720 /** This filter is documented in wp-includes/class-wp-http-streams.php */ 721 'sslverify' => apply_filters( 'https_local_ssl_verify', false ), 722 ), 723 ), 724 $doing_wp_cron 725 ); 726 727 $result = wp_remote_post( $cron_request['url'], $cron_request['args'] ); 728 return ! is_wp_error( $result ); 729 } 730 731 /** 732 * Run scheduled callbacks or spawn cron for all scheduled events. 733 * 734 * Warning: This function may return Boolean FALSE, but may also return a non-Boolean 735 * value which evaluates to FALSE. For information about casting to booleans see the 736 * {@link https://php.net/manual/en/language.types.boolean.php PHP documentation}. Use 737 * the `===` operator for testing the return value of this function. 738 * 739 * @since 2.1.0 740 * @since 5.1.0 Return value added to indicate success or failure. 741 * 742 * @return bool|int On success an integer indicating number of events spawned (0 indicates no 743 * events needed to be spawned), false if spawning fails for one or more events. 744 */ 745 function wp_cron() { 746 // Prevent infinite loops caused by lack of wp-cron.php 747 if ( strpos( $_SERVER['REQUEST_URI'], '/wp-cron.php' ) !== false || ( defined( 'DISABLE_WP_CRON' ) && DISABLE_WP_CRON ) ) { 748 return 0; 749 } 750 751 $crons = wp_get_ready_cron_jobs(); 752 if ( empty( $crons ) ) { 753 return 0; 754 } 755 756 $gmt_time = microtime( true ); 757 $keys = array_keys( $crons ); 758 if ( isset( $keys[0] ) && $keys[0] > $gmt_time ) { 759 return 0; 760 } 761 762 $schedules = wp_get_schedules(); 763 $results = array(); 764 foreach ( $crons as $timestamp => $cronhooks ) { 765 if ( $timestamp > $gmt_time ) { 766 break; 767 } 768 foreach ( (array) $cronhooks as $hook => $args ) { 769 if ( isset( $schedules[ $hook ]['callback'] ) && ! call_user_func( $schedules[ $hook ]['callback'] ) ) { 770 continue; 771 } 772 $results[] = spawn_cron( $gmt_time ); 773 break 2; 774 } 775 } 776 777 if ( in_array( false, $results, true ) ) { 778 return false; 779 } 780 return count( $results ); 781 } 782 783 /** 784 * Retrieve supported event recurrence schedules. 785 * 786 * The default supported recurrences are 'hourly', 'twicedaily', and 'daily'. A plugin may 787 * add more by hooking into the {@see 'cron_schedules'} filter. The filter accepts an array 788 * of arrays. The outer array has a key that is the name of the schedule or for 789 * example 'weekly'. The value is an array with two keys, one is 'interval' and 790 * the other is 'display'. 791 * 792 * The 'interval' is a number in seconds of when the cron job should run. So for 793 * 'hourly', the time is 3600 or 60*60. For weekly, the value would be 794 * 60*60*24*7 or 604800. The value of 'interval' would then be 604800. 795 * 796 * The 'display' is the description. For the 'weekly' key, the 'display' would 797 * be `__( 'Once Weekly' )`. 798 * 799 * For your plugin, you will be passed an array. you can easily add your 800 * schedule by doing the following. 801 * 802 * // Filter parameter variable name is 'array'. 803 * $array['weekly'] = array( 804 * 'interval' => 604800, 805 * 'display' => __( 'Once Weekly' ) 806 * ); 807 * 808 * @since 2.1.0 809 * 810 * @return array 811 */ 812 function wp_get_schedules() { 813 $schedules = array( 814 'hourly' => array( 815 'interval' => HOUR_IN_SECONDS, 816 'display' => __( 'Once Hourly' ), 817 ), 818 'twicedaily' => array( 819 'interval' => 12 * HOUR_IN_SECONDS, 820 'display' => __( 'Twice Daily' ), 821 ), 822 'daily' => array( 823 'interval' => DAY_IN_SECONDS, 824 'display' => __( 'Once Daily' ), 825 ), 826 ); 827 /** 828 * Filters the non-default cron schedules. 829 * 830 * @since 2.1.0 831 * 832 * @param array $new_schedules An array of non-default cron schedules. Default empty. 833 */ 834 return array_merge( apply_filters( 'cron_schedules', array() ), $schedules ); 835 } 836 837 /** 838 * Retrieve the recurrence schedule for an event. 839 * 840 * @see wp_get_schedules() for available schedules. 841 * 842 * @since 2.1.0 843 * @since 5.1.0 {@see 'get_schedule'} filter added. 844 * 845 * @param string $hook Action hook to identify the event. 846 * @param array $args Optional. Arguments passed to the event's callback function. 847 * @return string|false False, if no schedule. Schedule name on success. 848 */ 849 function wp_get_schedule( $hook, $args = array() ) { 850 $schedule = false; 851 $event = wp_get_scheduled_event( $hook, $args ); 852 853 if ( $event ) { 854 $schedule = $event->schedule; 855 } 856 857 /** 858 * Filter the schedule for a hook. 859 * 860 * @since 5.1.0 861 * 862 * @param string|bool $schedule Schedule for the hook. False if not found. 863 * @param string $hook Action hook to execute when cron is run. 864 * @param array $args Optional. Arguments to pass to the hook's callback function. 865 */ 866 return apply_filters( 'get_schedule', $schedule, $hook, $args ); 867 } 868 869 /** 870 * Retrieve cron jobs ready to be run. 871 * 872 * Returns the results of _get_cron_array() limited to events ready to be run, 873 * ie, with a timestamp in the past. 874 * 875 * @since 5.1.0 876 * 877 * @return array Cron jobs ready to be run. 878 */ 879 function wp_get_ready_cron_jobs() { 880 /** 881 * Filter to preflight or hijack retrieving ready cron jobs. 882 * 883 * Returning an array will short-circuit the normal retrieval of ready 884 * cron jobs, causing the function to return the filtered value instead. 885 * 886 * @since 5.1.0 887 * 888 * @param null|array $pre Array of ready cron tasks to return instead. Default null 889 * to continue using results from _get_cron_array(). 890 */ 891 $pre = apply_filters( 'pre_get_ready_cron_jobs', null ); 892 if ( null !== $pre ) { 893 return $pre; 894 } 895 896 $crons = _get_cron_array(); 897 898 if ( false === $crons ) { 899 return array(); 900 } 901 902 $gmt_time = microtime( true ); 903 $keys = array_keys( $crons ); 904 if ( isset( $keys[0] ) && $keys[0] > $gmt_time ) { 905 return array(); 906 } 907 908 $results = array(); 909 foreach ( $crons as $timestamp => $cronhooks ) { 910 if ( $timestamp > $gmt_time ) { 911 break; 912 } 913 $results[ $timestamp ] = $cronhooks; 914 } 915 916 return $results; 917 } 918 919 // 920 // Private functions 921 // 922 923 /** 924 * Retrieve cron info array option. 925 * 926 * @since 2.1.0 927 * @access private 928 * 929 * @return false|array CRON info array. 930 */ 931 function _get_cron_array() { 932 $cron = get_option( 'cron' ); 933 if ( ! is_array( $cron ) ) { 934 return false; 935 } 936 937 if ( ! isset( $cron['version'] ) ) { 938 $cron = _upgrade_cron_array( $cron ); 939 } 940 941 unset( $cron['version'] ); 942 943 return $cron; 944 } 945 946 /** 947 * Updates the CRON option with the new CRON array. 948 * 949 * @since 2.1.0 950 * @since 5.1.0 Return value modified to outcome of update_option(). 951 * 952 * @access private 953 * 954 * @param array $cron Cron info array from _get_cron_array(). 955 * @return bool True if cron array updated, false on failure. 956 */ 957 function _set_cron_array( $cron ) { 958 $cron['version'] = 2; 959 return update_option( 'cron', $cron ); 960 } 961 962 /** 963 * Upgrade a Cron info array. 964 * 965 * This function upgrades the Cron info array to version 2. 966 * 967 * @since 2.1.0 968 * @access private 969 * 970 * @param array $cron Cron info array from _get_cron_array(). 971 * @return array An upgraded Cron info array. 972 */ 973 function _upgrade_cron_array( $cron ) { 974 if ( isset( $cron['version'] ) && 2 == $cron['version'] ) { 975 return $cron; 976 } 977 978 $new_cron = array(); 979 980 foreach ( (array) $cron as $timestamp => $hooks ) { 981 foreach ( (array) $hooks as $hook => $args ) { 982 $key = md5( serialize( $args['args'] ) ); 983 $new_cron[ $timestamp ][ $hook ][ $key ] = $args; 984 } 985 } 986 987 $new_cron['version'] = 2; 988 update_option( 'cron', $new_cron ); 989 return $new_cron; 990 }
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