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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 |
|---|---|
| 545 | * @since 5.1.0 |
| 546 | * |
| 547 | * @param null|false|object $pre Value to return instead. Default null to continue retrieving the event. |
| 548 | * @param string $hook Action hook of the event. |
| 549 | * @param array $args Array containing each separate argument to pass to the hook's callback function. |
| 550 | * Although not passed to a callback, these arguments are used to uniquely identify |
| 551 | * the event. |
| 552 | * @param int|null $timestamp Unix timestamp (UTC) of the event. Null to retrieve next scheduled event. |
| 553 | */ |
| 554 | $pre = apply_filters( 'pre_get_scheduled_event', null, $hook, $args, $timestamp ); |
| 555 | if ( null !== $pre ) { |
| 556 | return $pre; |
| 557 | } |
| 558 | |
| 559 | if ( null !== $timestamp && ! is_numeric( $timestamp ) ) { |
| 560 | return false; |
| 561 | } |
| 562 | |
| 563 | $crons = _get_cron_array(); |