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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 |
|---|---|
| 491 | * @since 5.1.0 |
| 492 | * @since 5.7.0 The `$wp_error` parameter was added, and a `WP_Error` object can now be returned. |
| 493 | * |
| 494 | * @param null|bool|WP_Error $pre Value to return instead. Default null to continue unscheduling the event. |
| 495 | * @param int $timestamp Timestamp for when to run the event. |
| 496 | * @param string $hook Action hook, the execution of which will be unscheduled. |
| 497 | * @param array $args Arguments to pass to the hook's callback function. |
| 498 | * @param bool $wp_error Whether to return a WP_Error on failure. |
| 499 | */ |
| 500 | $pre = apply_filters( 'pre_unschedule_event', null, $timestamp, $hook, $args, $wp_error ); |
| 501 | |
| 502 | if ( null !== $pre ) { |
| 503 | if ( $wp_error && false === $pre ) { |
| 504 | return new WP_Error( |
| 505 | 'pre_unschedule_event_false', |
| 506 | __( 'A plugin prevented the event from being unscheduled.' ) |
| 507 | ); |
| 508 | } |
| 509 | |