February 12, 2011 
Definition:
function wp_schedule_event( $timestamp, $recurrence, $hook, $args = array() {}
Schedule a periodic event.
Schedules a hook which will be executed by the WordPress actions core on a specific interval, specified by you. The action will trigger when someone visits your WordPress site, if the scheduled time has passed.
Parameters
- int $timestamp: Timestamp for when to run the event.
- string $recurrence: How often the event should recur.
- string $hook: Action hook to execute when cron is run.
- array $args: Optional. Arguments to pass to the hook’s callback function.
Return values
returns:False on failure, null when complete with scheduling event.
Defined filters
- schedule_event
apply_filters('schedule_event', $event)
Source code
function wp_schedule_event( $timestamp, $recurrence, $hook, $args = array()) {
$crons = _get_cron_array();
$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'] );
$event = apply_filters('schedule_event', $event);
// A plugin disallowed this event
if ( ! $event )
return false;
$key = md5(serialize($event->args));
$crons[$event->timestamp][$event->hook][$key] = array( 'schedule' => $event->schedule, 'args' => $event->args, 'interval' => $event->interval );
uksort( $crons, "strnatcasecmp" );
_set_cron_array( $crons );
}
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