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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 393 | * |
| 394 | * @type string $hook Action hook to execute when the event is run. |
| 395 | * @type int $timestamp Unix timestamp (UTC) for when to next run the event. |
| 396 | * @type string $schedule How often the event should subsequently recur. |
| 397 | * @type array $args Array containing each separate argument to pass to the hook's callback function. |
| 398 | * @type int $interval The interval time in seconds for the schedule. |
| 399 | * } |
| 400 | * @param bool $wp_error Whether to return a WP_Error on failure. |
| 401 | */ |
| 402 | $pre = apply_filters( 'pre_reschedule_event', null, $event, $wp_error ); |
| 403 | |
| 404 | if ( null !== $pre ) { |
| 405 | if ( $wp_error && false === $pre ) { |
| 406 | return new WP_Error( |
| 407 | 'pre_reschedule_event_false', |
| 408 | __( 'A plugin prevented the event from being rescheduled.' ) |
| 409 | ); |
| 410 | } |
| 411 | |