pre_unschedule_hook │ filter-hook │ WP 5.1.0

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) or false if unscheduling one or more events fails.

Usage

add_filter( 'pre_unschedule_hook', 'wp_kama_pre_unschedule_hook_filter', 10, 3 );

/**
 * Function for `pre_unschedule_hook` filter-hook.
 * 
 * @param null|int|false|WP_Error $pre      Value to return instead.
 * @param string                  $hook     Action hook, the execution of which will be unscheduled.
 * @param bool                    $wp_error Whether to return a WP_Error on failure.
 *
 * @return null|int|false|WP_Error
 */
function wp_kama_pre_unschedule_hook_filter( $pre, $hook, $wp_error ){

	// filter...
	return $pre;
}

$pre(null|int|false|WP_Error)

Value to return instead.
Default: null to continue unscheduling the hook

$hook(string)

Action hook, the execution of which will be unscheduled.

$wp_error(true|false)

Whether to return a WP_Error on failure.

Changelog

Where the hook is called

$pre = apply_filters( 'pre_unschedule_hook', null, $hook, $wp_error );

Where the hook is used in WordPress