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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 |
|---|---|
| 476 | * For plugins replacing wp-cron, return the number of events successfully |
| 477 | * unscheduled (zero if no events were registered with the hook) or false |
| 478 | * if unscheduling one or more events fails. |
| 479 | * |
| 480 | * @since 5.1.0 |
| 481 | * |
| 482 | * @param null|int|false $pre Value to return instead. Default null to continue unscheduling the hook. |
| 483 | * @param string $hook Action hook, the execution of which will be unscheduled. |
| 484 | */ |
| 485 | $pre = apply_filters( 'pre_unschedule_hook', null, $hook ); |
| 486 | if ( null !== $pre ) { |
| 487 | return $pre; |
| 488 | } |
| 489 | |
| 490 | $crons = _get_cron_array(); |
| 491 | if ( empty( $crons ) ) { |
| 492 | return 0; |
| 493 | } |
| 494 | |