wp_schedule_event( int $timestamp, string $recurrence, string $hook, array $args = array() )

Schedules a recurring event.

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Description Description

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’, ‘daily’, and ‘twicedaily’. These can be extended using the ‘cron_schedules’ filter in wp_get_schedules().

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_single_event() to schedule a non-recurring event.

Parameters Parameters

$timestamp

(int) (Required) Unix timestamp (UTC) for when to next run the event.

$recurrence

(string) (Required) How often the event should subsequently recur. See wp_get_schedules() for accepted values.

$hook

(string) (Required) Action hook to execute when the event is run.

$args

(array) (Optional) Array containing each separate argument to pass to the hook's callback function.

Default value: array()

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Return Return

(bool) True if event successfully scheduled. False for failure.

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Source Source

File: wp-includes/cron.php 

function wp_schedule_event( $timestamp, $recurrence, $hook, $args = array() ) {
	// Make sure timestamp is a positive integer
	if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) {
		return false;
	}

	$schedules = wp_get_schedules();

	if ( ! isset( $schedules[ $recurrence ] ) ) {
		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 );
	if ( null !== $pre ) {
		return $pre;
	}

	/** This filter is documented in wp-includes/cron.php */
	$event = apply_filters( 'schedule_event', $event );

	// A plugin disallowed this event
	if ( ! $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 );
}

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Changelog Changelog

Changelog
Version Description
5.1.0 Return value modified to boolean indicating success or failure, 'pre_schedule_event' filter added to short-circuit the function.
2.1.0 Introduced.

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Uses Uses

Uses
Uses Description
wp-includes/cron.php: pre_schedule_event

Filter to preflight or hijack scheduling an event.
wp-includes/cron.php: wp_get_schedules()

Retrieve supported event recurrence schedules.
wp-includes/cron.php: _get_cron_array()

Retrieve cron info array option.
wp-includes/cron.php: _set_cron_array()

Updates the CRON option with the new CRON array.
wp-includes/cron.php: schedule_event

Modify an event before it is scheduled.
wp-includes/plugin.php: apply_filters()

Call the functions added to a filter hook.
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Used By Used By

Used By
Used By Description
wp-includes/functions.php: wp_schedule_delete_old_privacy_export_files()

Schedule a WP_Cron job to delete expired export files.
wp-admin/includes/post.php: get_default_post_to_edit()

Default post information to use when populating the “Write Post” form.
wp-includes/cron.php: wp_reschedule_event()

Reschedules a recurring event.
wp-includes/update.php: wp_schedule_update_checks()

Schedule core, theme, and plugin update checks.
wp-includes/ms-functions.php: wp_schedule_update_network_counts()

Schedule update of the network-wide counts for the current network.

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User Contributed Notes User Contributed Notes

  1. Skip to note 1 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 3You must log in to vote on the helpfulness of this note
    Contributed by Sushil Adhikari —

    Schedule hourly event with multiple arguments
    wp_schedule_event() pass arguments by reference, so we have to send multiple data as indexed array.

    register_activation_hook( __FILE__, 'my_activation' );
 
function my_activation() {
	$args = array( $args_1, $args_2 );
	if (! wp_next_scheduled ( 'my_hourly_event', $args )) {
    	wp_schedule_event( time(), 'hourly', 'my_hourly_event', $args );
    }
}

    Don’t forgot to add total number of argument as $accepted_args on add_action().

    add_action( 'my_hourly_event', 'do_this_hourly', 10, 2 );
function do_this_hourly($args_1, $args_2 ) {
    // do something every hour
}

    Don’t forget to clean the scheduler on deactivation:

    register_deactivation_hook( __FILE__, 'my_deactivation' );
 
function my_deactivation() {
    wp_clear_scheduled_hook( 'my_hourly_event' );
}
  4. Skip to note 4 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note
    Contributed by Codex —

    Schedule an hourly event
    To schedule an hourly event in a plugin, call wp_schedule_event on activation (otherwise you will end up with a lot of scheduled events!):

    register_activation_hook( __FILE__, 'my_activation' );
add_action( 'my_hourly_event', 'do_this_hourly' );

function my_activation() {
    wp_schedule_event( time(), 'hourly', 'my_hourly_event' );
}

function do_this_hourly() {
    // do something every hour
}

    Don’t forget to clean the scheduler on deactivation:

    register_deactivation_hook( __FILE__, 'my_deactivation' );

function my_deactivation() {
    wp_clear_scheduled_hook( 'my_hourly_event' );
}

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