wp_unschedule_event( int $timestamp, string $hook, array $args = array(), bool $wp_error = false ): bool|WP_Error

Unschedules a previously scheduled event.


The $timestamp and $hook parameters are required so that the event can be identified.

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$timestamp int Required
Unix timestamp (UTC) of the event.
$hook string Required
Action hook of the event.
$args array 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: array()

$wp_error bool Optional
Whether to return a WP_Error on failure.

Default: false

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bool|WP_Error True if event successfully unscheduled. False or WP_Error on failure.

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More Information

Note that you need to know the exact time of the next occurrence when scheduled hook was set to run, and the function arguments it was supposed to have, in order to unschedule it. All future occurrences are unscheduled by calling this function.

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File: wp-includes/cron.php. View all references

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(
				__( 'Event timestamp must be a valid Unix timestamp.' )

		return false;

	 * Filter to preflight or hijack 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 Timestamp 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(
				__( '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 );

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Version Description
5.7.0 The $wp_error parameter was added.
5.1.0 Return value modified to boolean indicating success or failure, 'pre_unschedule_event' filter added to short-circuit the function.
2.1.0 Introduced.

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User Contributed Notes

  1. Skip to note 1 content
    Contributed by Codex


    // Get the timestamp for the next event.
    $timestamp = wp_next_scheduled( 'my_schedule_hook' );
    // If this event was created with any special arguments, you need to get those too.
    $original_args = array();
    wp_unschedule_event( $timestamp, 'my_schedule_hook', $original_args );

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