<?php
/**
* WordPress Cron API
*
* @package WordPress
*/
/**
* Schedules an event to run only once.
*
* Schedules a hook which will be triggered by WordPress at the specified UTC time.
* The action will trigger when someone visits your WordPress site if the scheduled
* time has passed.
*
* Note that scheduling an event to occur within 10 minutes of an existing event
* with the same action hook will be ignored unless you pass unique `$args` values
* for each scheduled event.
*
* Use wp_next_scheduled() to prevent duplicate events.
*
* Use wp_schedule_event() to schedule a recurring event.
*
* @since 2.1.0
* @since 5.1.0 Return value modified to boolean indicating success or failure,
* {@see 'pre_schedule_event'} filter added to short-circuit the function.
* @since 5.7.0 The `$wp_error` parameter was added.
*
* @link https://developer.wordpress.org/reference/functions/wp_schedule_single_event/
*
* @param int $timestamp Unix timestamp (UTC) for when to next run the event.
* @param string $hook Action hook to execute when the event is run.
* @param array $args Optional. Array containing arguments to pass to the
* hook's callback function. Each value in the array
* is passed to the callback as an individual parameter.
* The array keys are ignored. Default empty array.
* @param bool $wp_error Optional. Whether to return a WP_Error on failure. Default false.
* @return bool|WP_Error True if event successfully scheduled. False or WP_Error on failure.
*/
function wp_schedule_single_event( $timestamp, $hook, $args = array(), $wp_error = false ) {
// Make sure timestamp is a positive integer.
if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) {
if ( $wp_error ) {
return new WP_Error(
'invalid_timestamp',
__( 'Event timestamp must be a valid Unix timestamp.' )
);
}
return false;
}
$event = (object) array(
'hook' => $hook,
'timestamp' => $timestamp,
'schedule' => false,
'args' => $args,
);
/**
* Filter to override scheduling an event.
*
* Returning a non-null value will short-circuit adding the event to the
* cron array, causing the function to return the filtered value instead.
*
* Both single events and recurring events are passed through this filter;
* single events have `$event->schedule` as false, whereas recurring events
* have this set to a recurrence from wp_get_schedules(). Recurring
* events also have the integer recurrence interval set as `$event->interval`.
*
* For plugins replacing wp-cron, it is recommended you check for an
* identical event within ten minutes and apply the {@see 'schedule_event'}
* filter to check if another plugin has disallowed the event before scheduling.
*
* Return true if the event was scheduled, false or a WP_Error if not.
*
* @since 5.1.0
* @since 5.7.0 The `$wp_error` parameter was added, and a `WP_Error` object can now be returned.
*
* @param null|bool|WP_Error $result The value to return instead. Default null to continue adding the event.
* @param object $event {
* An object containing an event's data.
*
* @type string $hook Action hook to execute when the event is run.
* @type int $timestamp Unix timestamp (UTC) for when to next run the event.
* @type string|false $schedule How often the event should subsequently recur.
* @type array $args Array containing each separate argument to pass to the hook's callback function.
* @type int $interval Optional. The interval time in seconds for the schedule. Only present for recurring events.
* }
* @param bool $wp_error Whether to return a WP_Error on failure.
*/
$pre = apply_filters( 'pre_schedule_event', null, $event, $wp_error );
if ( null !== $pre ) {
if ( $wp_error && false === $pre ) {
return new WP_Error(
'pre_schedule_event_false',
__( 'A plugin prevented the event from being scheduled.' )
);
}
if ( ! $wp_error && is_wp_error( $pre ) ) {
return false;
}
return $pre;
}
/*
* Check for a duplicated event.
*
* Don't schedule an event if there's already an identical event
* within 10 minutes.
*
* When scheduling events within ten minutes of the current time,
* all past identical events are considered duplicates.
*
* When scheduling an event with a past timestamp (ie, before the
* current time) all events scheduled within the next ten minutes
* are considered duplicates.
*/
$crons = _get_cron_array();
$key = md5( serialize( $event->args ) );
$duplicate = false;
if ( $event->timestamp < time() + 10 * MINUTE_IN_SECONDS ) {
$min_timestamp = 0;
} else {
$min_timestamp = $event->timestamp - 10 * MINUTE_IN_SECONDS;
}
if ( $event->timestamp < time() ) {
$max_timestamp = time() + 10 * MINUTE_IN_SECONDS;
} else {
$max_timestamp = $event->timestamp + 10 * MINUTE_IN_SECONDS;
}
foreach ( $crons as $event_timestamp => $cron ) {
if ( $event_timestamp < $min_timestamp ) {
continue;
}
if ( $event_timestamp > $max_timestamp ) {
break;
}
if ( isset( $cron[ $event->hook ][ $key ] ) ) {
$duplicate = true;
break;
}
}
if ( $duplicate ) {
if ( $wp_error ) {
return new WP_Error(
'duplicate_event',
__( 'A duplicate event already exists.' )
);
}
return false;
}
/**
* Modify an event before it is scheduled.
*
* @since 3.1.0
*
* @param object|false $event {
* An object containing an event's data, or boolean false to prevent the event from being scheduled.
*
* @type string $hook Action hook to execute when the event is run.
* @type int $timestamp Unix timestamp (UTC) for when to next run the event.
* @type string|false $schedule How often the event should subsequently recur.
* @type array $args Array containing each separate argument to pass to the hook's callback function.
* @type int $interval Optional. The interval time in seconds for the schedule. Only present for recurring events.
* }
*/
$event = apply_filters( 'schedule_event', $event );
// A plugin disallowed this event.
if ( ! $event ) {
if ( $wp_error ) {
return new WP_Error(
'schedule_event_false',
__( 'A plugin disallowed this event.' )
);
}
return false;
}
$crons[ $event->timestamp ][ $event->hook ][ $key ] = array(
'schedule' => $event->schedule,
'args' => $event->args,
);
uksort( $crons, 'strnatcasecmp' );
return _set_cron_array( $crons, $wp_error );
}
/**
* Schedules a recurring event.
*
* Schedules a hook which will be triggered by WordPress at the specified interval.
* The action will trigger when someone visits your WordPress site if the scheduled
* time has passed.
*
* Valid values for the recurrence are 'hourly', 'twicedaily', 'daily', and 'weekly'.
* These can be extended using the {@see 'cron_schedules'} filter in wp_get_schedules().
*
* Use wp_next_scheduled() to prevent duplicate events.
*
* Use wp_schedule_single_event() to schedule a non-recurring event.
*
* @since 2.1.0
* @since 5.1.0 Return value modified to boolean indicating success or failure,
* {@see 'pre_schedule_event'} filter added to short-circuit the function.
* @since 5.7.0 The `$wp_error` parameter was added.
*
* @link https://developer.wordpress.org/reference/functions/wp_schedule_event/
*
* @param int $timestamp Unix timestamp (UTC) for when to next run the event.
* @param string $recurrence How often the event should subsequently recur.
* See wp_get_schedules() for accepted values.
* @param string $hook Action hook to execute when the event is run.
* @param array $args Optional. Array containing arguments to pass to the
* hook's callback function. Each value in the array
* is passed to the callback as an individual parameter.
* The array keys are ignored. Default empty array.
* @param bool $wp_error Optional. Whether to return a WP_Error on failure. Default false.
* @return bool|WP_Error True if event successfully scheduled. False or WP_Error on failure.
*/
function wp_schedule_event( $timestamp, $recurrence, $hook, $args = array(), $wp_error = false ) {
// Make sure timestamp is a positive integer.
if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) {
if ( $wp_error ) {
return new WP_Error(
'invalid_timestamp',
__( 'Event timestamp must be a valid Unix timestamp.' )
);
}
return false;
}
$schedules = wp_get_schedules();
if ( ! isset( $schedules[ $recurrence ] ) ) {
if ( $wp_error ) {
return new WP_Error(
'invalid_schedule',
__( 'Event schedule does not exist.' )
);
}
return false;
}
$event = (object) array(
'hook' => $hook,
'timestamp' => $timestamp,
'schedule' => $recurrence,
'args' => $args,
'interval' => $schedules[ $recurrence ]['interval'],
);
/** This filter is documented in wp-includes/cron.php */
$pre = apply_filters( 'pre_schedule_event', null, $event, $wp_error );
if ( null !== $pre ) {
if ( $wp_error && false === $pre ) {
return new WP_Error(
'pre_schedule_event_false',
__( 'A plugin prevented the event from being scheduled.' )
);
}
if ( ! $wp_error && is_wp_error( $pre ) ) {
return false;
}
return $pre;
}
/** This filter is documented in wp-includes/cron.php */
$event = apply_filters( 'schedule_event', $event );
// A plugin disallowed this event.
if ( ! $event ) {
if ( $wp_error ) {
return new WP_Error(
'schedule_event_false',
__( 'A plugin disallowed this event.' )
);
}
return false;
}
$key = md5( serialize( $event->args ) );
$crons = _get_cron_array();
$crons[ $event->timestamp ][ $event->hook ][ $key ] = array(
'schedule' => $event->schedule,
'args' => $event->args,
'interval' => $event->interval,
);
uksort( $crons, 'strnatcasecmp' );
return _set_cron_array( $crons, $wp_error );
}
/**
* Reschedules a recurring event.
*
* Mainly for internal use, this takes the Unix timestamp (UTC) of a previously run
* recurring event and reschedules it for its next run.
*
* To change upcoming scheduled events, use wp_schedule_event() to
* change the recurrence frequency.
*
* @since 2.1.0
* @since 5.1.0 Return value modified to boolean indicating success or failure,
* {@see 'pre_reschedule_event'} filter added to short-circuit the function.
* @since 5.7.0 The `$wp_error` parameter was added.
*
* @param int $timestamp Unix timestamp (UTC) for when the event was scheduled.
* @param string $recurrence How often the event should subsequently recur.
* See wp_get_schedules() for accepted values.
* @param string $hook Action hook to execute when the event is run.
* @param array $args Optional. Array containing arguments to pass to the
* hook's callback function. Each value in the array
* is passed to the callback as an individual parameter.
* The array keys are ignored. Default empty array.
* @param bool $wp_error Optional. Whether to return a WP_Error on failure. Default false.
* @return bool|WP_Error True if event successfully rescheduled. False or WP_Error on failure.
*/
function wp_reschedule_event( $timestamp, $recurrence, $hook, $args = array(), $wp_error = false ) {
// Make sure timestamp is a positive integer.
if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) {
if ( $wp_error ) {
return new WP_Error(
'invalid_timestamp',
__( 'Event timestamp must be a valid Unix timestamp.' )
);
}
return false;
}
$schedules = wp_get_schedules();
$interval = 0;
// First we try to get the interval from the schedule.
if ( isset( $schedules[ $recurrence ] ) ) {
$interval = $schedules[ $recurrence ]['interval'];
}
// Now we try to get it from the saved interval in case the schedule disappears.
if ( 0 === $interval ) {
$scheduled_event = wp_get_scheduled_event( $hook, $args, $timestamp );
if ( $scheduled_event && isset( $scheduled_event->interval ) ) {
$interval = $scheduled_event->interval;
}
}
$event = (object) array(
'hook' => $hook,
'timestamp' => $timestamp,
'schedule' => $recurrence,
'args' => $args,
'interval' => $interval,
);
/**
* Filter to override rescheduling of a recurring event.
*
* Returning a non-null value will short-circuit the normal rescheduling
* process, causing the function to return the filtered value instead.
*
* For plugins replacing wp-cron, return true if the event was successfully
* rescheduled, false or a WP_Error if not.
*
* @since 5.1.0
* @since 5.7.0 The `$wp_error` parameter was added, and a `WP_Error` object can now be returned.
*
* @param null|bool|WP_Error $pre Value to return instead. Default null to continue adding the event.
* @param object $event {
* An object containing an event's data.
*
* @type string $hook Action hook to execute when the event is run.
* @type int $timestamp Unix timestamp (UTC) for when to next run the event.
* @type string $schedule How often the event should subsequently recur.
* @type array $args Array containing each separate argument to pass to the hook's callback function.
* @type int $interval The interval time in seconds for the schedule.
* }
* @param bool $wp_error Whether to return a WP_Error on failure.
*/
$pre = apply_filters( 'pre_reschedule_event', null, $event, $wp_error );
if ( null !== $pre ) {
if ( $wp_error && false === $pre ) {
return new WP_Error(
'pre_reschedule_event_false',
__( 'A plugin prevented the event from being rescheduled.' )
);
}
if ( ! $wp_error && is_wp_error( $pre ) ) {
return false;
}
return $pre;
}
// Now we assume something is wrong and fail to schedule.
if ( 0 === $interval ) {
if ( $wp_error ) {
return new WP_Error(
'invalid_schedule',
__( 'Event schedule does not exist.' )
);
}
return false;
}
$now = time();
if ( $timestamp >= $now ) {
$timestamp = $now + $interval;
} else {
$timestamp = $now + ( $interval - ( ( $now - $timestamp ) % $interval ) );
}
return wp_schedule_event( $timestamp, $recurrence, $hook, $args, $wp_error );
}
/**
* Unschedules a previously scheduled event.
*
* The `$timestamp` and `$hook` parameters are required so that the event can be
* identified.
*
* @since 2.1.0
* @since 5.1.0 Return value modified to boolean indicating success or failure,
* {@see 'pre_unschedule_event'} filter added to short-circuit the function.
* @since 5.7.0 The `$wp_error` parameter was added.
*
* @param int $timestamp Unix timestamp (UTC) of the event.
* @param string $hook Action hook of the event.
* @param array $args Optional. Array containing each separate argument to pass to the hook's callback function.
* Although not passed to a callback, these arguments are used to uniquely identify the
* event, so they should be the same as those used when originally scheduling the event.
* Default empty array.
* @param bool $wp_error Optional. Whether to return a WP_Error on failure. Default false.
* @return bool|WP_Error True if event successfully unscheduled. False or WP_Error on failure.
*/
function wp_unschedule_event( $timestamp, $hook, $args = array(), $wp_error = false ) {
// Make sure timestamp is a positive integer.
if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) {
if ( $wp_error ) {
return new WP_Error(
'invalid_timestamp',
__( 'Event timestamp must be a valid Unix timestamp.' )
);
}
return false;
}
/**
* Filter to override unscheduling of events.
*
* Returning a non-null value will short-circuit the normal unscheduling
* process, causing the function to return the filtered value instead.
*
* For plugins replacing wp-cron, return true if the event was successfully
* unscheduled, false or a WP_Error if not.
*
* @since 5.1.0
* @since 5.7.0 The `$wp_error` parameter was added, and a `WP_Error` object can now be returned.
*
* @param null|bool|WP_Error $pre Value to return instead. Default null to continue unscheduling the event.
* @param int $timestamp Unix timestamp (UTC) for when to run the event.
* @param string $hook Action hook, the execution of which will be unscheduled.
* @param array $args Arguments to pass to the hook's callback function.
* @param bool $wp_error Whether to return a WP_Error on failure.
*/
$pre = apply_filters( 'pre_unschedule_event', null, $timestamp, $hook, $args, $wp_error );
if ( null !== $pre ) {
if ( $wp_error && false === $pre ) {
return new WP_Error(
'pre_unschedule_event_false',
__( 'A plugin prevented the event from being unscheduled.' )
);
}
if ( ! $wp_error && is_wp_error( $pre ) ) {
return false;
}
return $pre;
}
$crons = _get_cron_array();
$key = md5( serialize( $args ) );
unset( $crons[ $timestamp ][ $hook ][ $key ] );
if ( empty( $crons[ $timestamp ][ $hook ] ) ) {
unset( $crons[ $timestamp ][ $hook ] );
}
if ( empty( $crons[ $timestamp ] ) ) {
unset( $crons[ $timestamp ] );
}
return _set_cron_array( $crons, $wp_error );
}
/**
* Unschedules all events attached to the hook with the specified arguments.
*
* Warning: This function may return boolean false, but may also return a non-boolean
* value which evaluates to false. For information about casting to booleans see the
* {@link https://www.php.net/manual/en/language.types.boolean.php PHP documentation}. Use
* the `===` operator for testing the return value of this function.
*
* @since 2.1.0
* @since 5.1.0 Return value modified to indicate success or failure,
* {@see 'pre_clear_scheduled_hook'} filter added to short-circuit the function.
* @since 5.7.0 The `$wp_error` parameter was added.
*
* @param string $hook Action hook, the execution of which will be unscheduled.
* @param array $args Optional. Array containing each separate argument to pass to the hook's callback function.
* Although not passed to a callback, these arguments are used to uniquely identify the
* event, so they should be the same as those used when originally scheduling the event.
* Default empty array.
* @param bool $wp_error Optional. Whether to return a WP_Error on failure. Default false.
* @return int|false|WP_Error On success an integer indicating number of events unscheduled (0 indicates no
* events were registered with the hook and arguments combination), false or WP_Error
* if unscheduling one or more events fail.
*/
function wp_clear_scheduled_hook( $hook, $args = array(), $wp_error = false ) {
/*
* Backward compatibility.
* Previously, this function took the arguments as discrete vars rather than an array like the rest of the API.
*/
if ( ! is_array( $args ) ) {
_deprecated_argument(
__FUNCTION__,
'3.0.0',
__( 'This argument has changed to an array to match the behavior of the other cron functions.' )
);
$args = array_slice( func_get_args(), 1 ); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection
$wp_error = false;
}
/**
* Filter to override clearing a scheduled hook.
*
* Returning a non-null value will short-circuit the normal unscheduling
* process, causing the function to return the filtered value instead.
*
* For plugins replacing wp-cron, return the number of events successfully
* unscheduled (zero if no events were registered with the hook) or false
* or a WP_Error if unscheduling one or more events fails.
*
* @since 5.1.0
* @since 5.7.0 The `$wp_error` parameter was added, and a `WP_Error` object can now be returned.
*
* @param null|int|false|WP_Error $pre Value to return instead. Default null to continue unscheduling the event.
* @param string $hook Action hook, the execution of which will be unscheduled.
* @param array $args Arguments to pass to the hook's callback function.
* @param bool $wp_error Whether to return a WP_Error on failure.
*/
$pre = apply_filters( 'pre_clear_scheduled_hook', null, $hook, $args, $wp_error );
if ( null !== $pre ) {
if ( $wp_error && false === $pre ) {
return new WP_Error(
'pre_clear_scheduled_hook_false',
__( 'A plugin prevented the hook from being cleared.' )
);
}
if ( ! $wp_error && is_wp_error( $pre ) ) {
return false;
}
return $pre;
}
/*
* This logic duplicates wp_next_scheduled().
* It's required due to a scenario where wp_unschedule_event() fails due to update_option() failing,
* and, wp_next_scheduled() returns the same schedule in an infinite loop.
*/
$crons = _get_cron_array();
if ( empty( $crons ) ) {
return 0;
}
$results = array();
$key = md5( serialize( $args ) );
foreach ( $crons as $timestamp => $cron ) {
if ( isset( $cron[ $hook ][ $key ] ) ) {
$results[] = wp_unschedule_event( $timestamp, $hook, $args, true );
}
}
$errors = array_filter( $results, 'is_wp_error' );
$error = new WP_Error();
if ( $errors ) {
if ( $wp_error ) {
array_walk( $errors, array( $error, 'merge_from' ) );
return $error;
}
return false;
}
return count( $results );
}
/**
* Unschedules all events attached to the hook.
*
* Can be useful for plugins when deactivating to clean up the cron queue.
*
* Warning: This function may return boolean false, but may also return a non-boolean
* value which evaluates to false. For information about casting to booleans see the
* {@link https://www.php.net/manual/en/language.types.boolean.php PHP documentation}. Use
* the `===` operator for testing the return value of this function.
*
* @since 4.9.0
* @since 5.1.0 Return value added to indicate success or failure.
* @since 5.7.0 The `$wp_error` parameter was added.
*
* @param string $hook Action hook, the execution of which will be unscheduled.
* @param bool $wp_error Optional. Whether to return a WP_Error on failure. Default false.
* @return int|false|WP_Error On success an integer indicating number of events unscheduled (0 indicates no
* events were registered on the hook), false or WP_Error if unscheduling fails.
*/
function wp_unschedule_hook( $hook, $wp_error = false ) {
/**
* Filter to override clearing all events attached to the hook.
*
* Returning a non-null value will short-circuit the normal unscheduling
* process, causing the function to return the filtered value instead.
*
* For plugins replacing wp-cron, return the number of events successfully
* unscheduled (zero if no events were registered with the hook). If unscheduling
* one or more events fails then return either a WP_Error object or false depending
* on the value of the `$wp_error` parameter.
*
* @since 5.1.0
* @since 5.7.0 The `$wp_error` parameter was added, and a `WP_Error` object can now be returned.
*
* @param null|int|false|WP_Error $pre Value to return instead. Default null to continue unscheduling the hook.
* @param string $hook Action hook, the execution of which will be unscheduled.
* @param bool $wp_error Whether to return a WP_Error on failure.
*/
$pre = apply_filters( 'pre_unschedule_hook', null, $hook, $wp_error );
if ( null !== $pre ) {
if ( $wp_error && false === $pre ) {
return new WP_Error(
'pre_unschedule_hook_false',
__( 'A plugin prevented the hook from being cleared.' )
);
}
if ( ! $wp_error && is_wp_error( $pre ) ) {
return false;
}
return $pre;
}
$crons = _get_cron_array();
if ( empty( $crons ) ) {
return 0;
}
$results = array();
foreach ( $crons as $timestamp => $args ) {
if ( ! empty( $crons[ $timestamp ][ $hook ] ) ) {
$results[] = count( $crons[ $timestamp ][ $hook ] );
}
unset( $crons[ $timestamp ][ $hook ] );
if ( empty( $crons[ $timestamp ] ) ) {
unset( $crons[ $timestamp ] );
}
}
/*
* If the results are empty (zero events to unschedule), no attempt
* to update the cron array is required.
*/
if ( empty( $results ) ) {
return 0;
}
$set = _set_cron_array( $crons, $wp_error );
if ( true === $set ) {
return array_sum( $results );
}
return $set;
}
/**
* Retrieves a scheduled event.
*
* Retrieves the full event object for a given event, if no timestamp is specified the next
* scheduled event is returned.
*
* @since 5.1.0
*
* @param string $hook Action hook of the event.
* @param array $args Optional. Array containing each separate argument to pass to the hook's callback function.
* Although not passed to a callback, these arguments are used to uniquely identify the
* event, so they should be the same as those used when originally scheduling the event.
* Default empty array.
* @param int|null $timestamp Optional. Unix timestamp (UTC) of the event. If not specified, the next scheduled event
* is returned. Default null.
* @return object|false {
* The event object. False if the event does not exist.
*
* @type string $hook Action hook to execute when the event is run.
* @type int $timestamp Unix timestamp (UTC) for when to next run the event.
* @type string|false $schedule How often the event should subsequently recur.
* @type array $args Array containing each separate argument to pass to the hook's callback function.
* @type int $interval Optional. The interval time in seconds for the schedule. Only present for recurring events.
* }
*/
function wp_get_scheduled_event( $hook, $args = array(), $timestamp = null ) {
/**
* Filter to override retrieving a scheduled event.
*
* Returning a non-null value will short-circuit the normal process,
* returning the filtered value instead.
*
* Return false if the event does not exist, otherwise an event object
* should be returned.
*
* @since 5.1.0
*
* @param null|false|object $pre Value to return instead. Default null to continue retrieving the event.
* @param string $hook Action hook of the event.
* @param array $args Array containing each separate argument to pass to the hook's callback function.
* Although not passed to a callback, these arguments are used to uniquely identify
* the event.
* @param int|null $timestamp Unix timestamp (UTC) of the event. Null to retrieve next scheduled event.
*/
$pre = apply_filters( 'pre_get_scheduled_event', null, $hook, $args, $timestamp );
if ( null !== $pre ) {
return $pre;
}
if ( null !== $timestamp && ! is_numeric( $timestamp ) ) {
return false;
}
$crons = _get_cron_array();
if ( empty( $crons ) ) {
return false;
}
$key = md5( serialize( $args ) );
if ( ! $timestamp ) {
// Get next event.
$next = false;
foreach ( $crons as $timestamp => $cron ) {
if ( isset( $cron[ $hook ][ $key ] ) ) {
$next = $timestamp;
break;
}
}
if ( ! $next ) {
return false;
}
$timestamp = $next;
} elseif ( ! isset( $crons[ $timestamp ][ $hook ][ $key ] ) ) {
return false;
}
$event = (object) array(
'hook' => $hook,
'timestamp' => $timestamp,
'schedule' => $crons[ $timestamp ][ $hook ][ $key ]['schedule'],
'args' => $args,
);
if ( isset( $crons[ $timestamp ][ $hook ][ $key ]['interval'] ) ) {
$event->interval = $crons[ $timestamp ][ $hook ][ $key ]['interval'];
}
return $event;
}
/**
* Retrieves the timestamp of the next scheduled event for the given hook.
*
* @since 2.1.0
*
* @param string $hook Action hook of the event.
* @param array $args Optional. Array containing each separate argument to pass to the hook's callback function.
* Although not passed to a callback, these arguments are used to uniquely identify the
* event, so they should be the same as those used when originally scheduling the event.
* Default empty array.
* @return int|false The Unix timestamp (UTC) of the next time the event will occur. False if the event doesn't exist.
*/
function wp_next_scheduled( $hook, $args = array() ) {
$next_event = wp_get_scheduled_event( $hook, $args );
if ( ! $next_event ) {
return false;
}
/**
* Filters the timestamp of the next scheduled event for the given hook.
*
* @since 6.8.0
*
* @param int $timestamp Unix timestamp (UTC) for when to next run the event.
* @param object $next_event {
* An object containing an event's data.
*
* @type string $hook Action hook of the event.
* @type int $timestamp Unix timestamp (UTC) for when to next run the event.
* @type string $schedule How often the event should subsequently recur.
* @type array $args Array containing each separate argument to pass to the hook
* callback function.
* @type int $interval Optional. The interval time in seconds for the schedule. Only
* present for recurring events.
* }
* @param array $args Array containing each separate argument to pass to the hook
* callback function.
*/
return apply_filters( 'wp_next_scheduled', $next_event->timestamp, $next_event, $hook, $args );
}
/**
* Sends a request to run cron through HTTP request that doesn't halt page loading.
*
* @since 2.1.0
* @since 5.1.0 Return values added.
*
* @param int $gmt_time Optional. Unix timestamp (UTC). Default 0 (current time is used).
* @return bool True if spawned, false if no events spawned.
*/
function spawn_cron( $gmt_time = 0 ) {
if ( ! $gmt_time ) {
$gmt_time = microtime( true );
}
if ( defined( 'DOING_CRON' ) || isset( $_GET['doing_wp_cron'] ) ) {
return false;
}
/*
* Get the cron lock, which is a Unix timestamp of when the last cron was spawned
* and has not finished running.
*
* Multiple processes on multiple web servers can run this code concurrently,
* this lock attempts to make spawning as atomic as possible.
*/
$lock = (float) get_transient( 'doing_cron' );
if ( $lock > $gmt_time + 10 * MINUTE_IN_SECONDS ) {
$lock = 0;
}
// Don't run if another process is currently running it or more than once every 60 sec.
if ( $lock + WP_CRON_LOCK_TIMEOUT > $gmt_time ) {
return false;
}
// Confidence check.
$crons = wp_get_ready_cron_jobs();
if ( empty( $crons ) ) {
return false;
}
$keys = array_keys( $crons );
if ( isset( $keys[0] ) && $keys[0] > $gmt_time ) {
return false;
}
if ( defined( 'ALTERNATE_WP_CRON' ) && ALTERNATE_WP_CRON ) {
if ( 'GET' !== $_SERVER['REQUEST_METHOD'] || defined( 'DOING_AJAX' ) || defined( 'XMLRPC_REQUEST' ) ) {
return false;
}
$doing_wp_cron = sprintf( '%.22F', $gmt_time );
set_transient( 'doing_cron', $doing_wp_cron );
ob_start();
wp_redirect( add_query_arg( 'doing_wp_cron', $doing_wp_cron, wp_unslash( $_SERVER['REQUEST_URI'] ) ) );
echo ' ';
// Flush any buffers and send the headers.
wp_ob_end_flush_all();
flush();
require_once ABSPATH . 'wp-cron.php';
return true;
}
// Set the cron lock with the current unix timestamp, when the cron is being spawned.
$doing_wp_cron = sprintf( '%.22F', $gmt_time );
set_transient( 'doing_cron', $doing_wp_cron );
/**
* Filters the cron request arguments.
*
* @since 3.5.0
* @since 4.5.0 The `$doing_wp_cron` parameter was added.
*
* @param array $cron_request_array {
* An array of cron request URL arguments.
*
* @type string $url The cron request URL.
* @type string $key The Unix timestamp (UTC) of the cron lock with microseconds.
* @type array $args {
* An array of cron request arguments.
*
* @type int $timeout The request timeout in seconds. Default .01 seconds.
* @type bool $blocking Whether to set blocking for the request. Default false.
* @type bool $sslverify Whether SSL should be verified for the request. Default false.
* }
* }
* @param string $doing_wp_cron The Unix timestamp (UTC) of the cron lock with microseconds.
*/
$cron_request = apply_filters(
'cron_request',
array(
'url' => add_query_arg( 'doing_wp_cron', $doing_wp_cron, site_url( 'wp-cron.php' ) ),
'key' => $doing_wp_cron,
'args' => array(
'timeout' => 0.01,
'blocking' => false,
/** This filter is documented in wp-includes/class-wp-http-streams.php */
'sslverify' => apply_filters( 'https_local_ssl_verify', false ),
),
),
$doing_wp_cron
);
$result = wp_remote_post( $cron_request['url'], $cron_request['args'] );
return ! is_wp_error( $result );
}
/**
* Registers _wp_cron() to run on the {@see 'shutdown'} action.
*
* The spawn_cron() function attempts to make a non-blocking loopback request to `wp-cron.php` (when alternative
* cron is not being used). However, the wp_remote_post() function does not always respect the `timeout` and
* `blocking` parameters. A timeout of `0.01` may end up taking 1 second. When this runs at the {@see 'wp_loaded'}
* action, it increases the Time To First Byte (TTFB) since the HTML cannot be sent while waiting for the cron request
* to initiate. Moving the spawning of cron to the {@see 'shutdown'} hook allows for the server to flush the HTML document to
* the browser while waiting for the request.
*
* @since 2.1.0
* @since 5.1.0 Return value added to indicate success or failure.
* @since 5.7.0 Functionality moved to _wp_cron() to which this becomes a wrapper.
* @since 6.9.0 The _wp_cron() callback is moved from {@see 'wp_loaded'} to the {@see 'shutdown'} action,
* unless `ALTERNATE_WP_CRON` is enabled; the function now always returns void.
*/
function wp_cron(): void {
if ( defined( 'ALTERNATE_WP_CRON' ) && ALTERNATE_WP_CRON ) {
if ( did_action( 'wp_loaded' ) ) {
_wp_cron();
} else {
add_action( 'wp_loaded', '_wp_cron', 20 );
}
} elseif ( doing_action( 'shutdown' ) ) {
_wp_cron();
} else {
add_action( 'shutdown', '_wp_cron' );
}
}
/**
* Runs scheduled callbacks or spawns cron for all scheduled events.
*
* Warning: This function may return Boolean FALSE, but may also return a non-Boolean
* value which evaluates to FALSE. For information about casting to booleans see the
* {@link https://www.php.net/manual/en/language.types.boolean.php PHP documentation}. Use
* the `===` operator for testing the return value of this function.
*
* @since 5.7.0
* @access private
*
* @return int|false On success an integer indicating number of events spawned (0 indicates no
* events needed to be spawned), false if spawning fails for one or more events.
*/
function _wp_cron() {
// Prevent infinite loops caused by lack of wp-cron.php.
if ( str_contains( $_SERVER['REQUEST_URI'], '/wp-cron.php' )
|| ( defined( 'DISABLE_WP_CRON' ) && DISABLE_WP_CRON )
) {
return 0;
}
$crons = wp_get_ready_cron_jobs();
if ( empty( $crons ) ) {
return 0;
}
$gmt_time = microtime( true );
$keys = array_keys( $crons );
if ( isset( $keys[0] ) && $keys[0] > $gmt_time ) {
return 0;
}
$schedules = wp_get_schedules();
$results = array();
foreach ( $crons as $timestamp => $cronhooks ) {
if ( $timestamp > $gmt_time ) {
break;
}
foreach ( (array) $cronhooks as $hook => $args ) {
if ( isset( $schedules[ $hook ]['callback'] )
&& ! call_user_func( $schedules[ $hook ]['callback'] )
) {
continue;
}
$results[] = spawn_cron( $gmt_time );
break 2;
}
}
if ( in_array( false, $results, true ) ) {
return false;
}
return count( $results );
}
/**
* Retrieves supported event recurrence schedules.
*
* The default supported recurrences are 'hourly', 'twicedaily', 'daily', and 'weekly'.
* A plugin may add more by hooking into the {@see 'cron_schedules'} filter.
* The filter accepts an array of arrays. The outer array has a key that is the name
* of the schedule, for example 'monthly'. The value is an array with two keys,
* one is 'interval' and the other is 'display'.
*
* The 'interval' is a number in seconds of when the cron job should run.
* So for 'hourly' the time is `HOUR_IN_SECONDS` (`60 * 60` or `3600`). For 'monthly',
* the value would be `MONTH_IN_SECONDS` (`30 * 24 * 60 * 60` or `2592000`).
*
* The 'display' is the description. For the 'monthly' key, the 'display'
* would be `__( 'Once Monthly' )`.
*
* For your plugin, you will be passed an array. You can add your
* schedule by doing the following:
*
* // Filter parameter variable name is 'array'.
* $array['monthly'] = array(
* 'interval' => MONTH_IN_SECONDS,
* 'display' => __( 'Once Monthly' )
* );
*
* @since 2.1.0
* @since 5.4.0 The 'weekly' schedule was added.
*
* @return array {
* The array of cron schedules keyed by the schedule name.
*
* @type array ...$0 {
* Cron schedule information.
*
* @type int $interval The schedule interval in seconds.
* @type string $display The schedule display name.
* }
* }
*/
function wp_get_schedules() {
$schedules = array(
'hourly' => array(
'interval' => HOUR_IN_SECONDS,
'display' => __( 'Once Hourly' ),
),
'twicedaily' => array(
'interval' => 12 * HOUR_IN_SECONDS,
'display' => __( 'Twice Daily' ),
),
'daily' => array(
'interval' => DAY_IN_SECONDS,
'display' => __( 'Once Daily' ),
),
'weekly' => array(
'interval' => WEEK_IN_SECONDS,
'display' => __( 'Once Weekly' ),
),
);
/**
* Filters the non-default cron schedules.
*
* @since 2.1.0
*
* @param array $new_schedules {
* An array of non-default cron schedules keyed by the schedule name. Default empty array.
*
* @type array ...$0 {
* Cron schedule information.
*
* @type int $interval The schedule interval in seconds.
* @type string $display The schedule display name.
* }
* }
*/
return array_merge( apply_filters( 'cron_schedules', array() ), $schedules );
}
/**
* Retrieves the name of the recurrence schedule for an event.
*
* @see wp_get_schedules() for available schedules.
*
* @since 2.1.0
* @since 5.1.0 {@see 'get_schedule'} filter added.
*
* @param string $hook Action hook to identify the event.
* @param array $args Optional. Arguments passed to the event's callback function.
* Default empty array.
* @return string|false Schedule name on success, false if no schedule.
*/
function wp_get_schedule( $hook, $args = array() ) {
$schedule = false;
$event = wp_get_scheduled_event( $hook, $args );
if ( $event ) {
$schedule = $event->schedule;
}
/**
* Filters the schedule name for a hook.
*
* @since 5.1.0
*
* @param string|false $schedule Schedule for the hook. False if not found.
* @param string $hook Action hook to execute when cron is run.
* @param array $args Arguments to pass to the hook's callback function.
*/
return apply_filters( 'get_schedule', $schedule, $hook, $args );
}
/**
* Retrieves cron jobs ready to be run.
*
* Returns the results of _get_cron_array() limited to events ready to be run,
* ie, with a timestamp in the past.
*
* @since 5.1.0
*
* @return array[] Array of cron job arrays ready to be run.
*/
function wp_get_ready_cron_jobs() {
/**
* Filter to override retrieving ready cron jobs.
*
* Returning an array will short-circuit the normal retrieval of ready
* cron jobs, causing the function to return the filtered value instead.
*
* @since 5.1.0
*
* @param null|array[] $pre Array of ready cron tasks to return instead. Default null
* to continue using results from _get_cron_array().
*/
$pre = apply_filters( 'pre_get_ready_cron_jobs', null );
if ( null !== $pre ) {
return $pre;
}
$crons = _get_cron_array();
$gmt_time = microtime( true );
$results = array();
foreach ( $crons as $timestamp => $cronhooks ) {
if ( $timestamp > $gmt_time ) {
break;
}
$results[ $timestamp ] = $cronhooks;
}
return $results;
}
//
// Private functions.
//
/**
* Retrieves cron info array option.
*
* @since 2.1.0
* @since 6.1.0 Return type modified to consistently return an array.
* @access private
*
* @return array[] Array of cron events.
*/
function _get_cron_array() {
$cron = get_option( 'cron' );
if ( ! is_array( $cron ) ) {
return array();
}
if ( ! isset( $cron['version'] ) ) {
$cron = _upgrade_cron_array( $cron );
}
unset( $cron['version'] );
return $cron;
}
/**
* Updates the cron option with the new cron array.
*
* @since 2.1.0
* @since 5.1.0 Return value modified to outcome of update_option().
* @since 5.7.0 The `$wp_error` parameter was added.
*
* @access private
*
* @param array[] $cron Array of cron info arrays from _get_cron_array().
* @param bool $wp_error Optional. Whether to return a WP_Error on failure. Default false.
* @return bool|WP_Error True if cron array updated. False or WP_Error on failure.
*/
function _set_cron_array( $cron, $wp_error = false ) {
if ( ! is_array( $cron ) ) {
$cron = array();
}
$cron['version'] = 2;
$result = update_option( 'cron', $cron, true );
if ( $wp_error && ! $result ) {
return new WP_Error(
'could_not_set',
__( 'The cron event list could not be saved.' )
);
}
return $result;
}
/**
* Upgrades a cron info array.
*
* This function upgrades the cron info array to version 2.
*
* @since 2.1.0
* @access private
*
* @param array $cron Cron info array from _get_cron_array().
* @return array An upgraded cron info array.
*/
function _upgrade_cron_array( $cron ) {
if ( isset( $cron['version'] ) && 2 === $cron['version'] ) {
return $cron;
}
$new_cron = array();
foreach ( (array) $cron as $timestamp => $hooks ) {
foreach ( (array) $hooks as $hook => $args ) {
$key = md5( serialize( $args['args'] ) );
$new_cron[ $timestamp ][ $hook ][ $key ] = $args;
}
}
$new_cron['version'] = 2;
update_option( 'cron', $new_cron, true );
return $new_cron;
}