Unschedule a previously scheduled event.
The $timestamp and $hook parameters are required so that the event can be identified.
(int) (Required) Unix timestamp (UTC) of the event.
(string) (Required) Action hook of the event.
(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 value: array()
(bool) True if event successfully unscheduled. False for failure.
|5.1.0||Return value modified to boolean indicating success or failure, 'pre_unschedule_event' filter added to short-circuit the function.|