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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 |
---|---|
437 | * For plugins replacing wp-cron, return the number of events successfully |
438 | * unscheduled (zero if no events were registered with the hook) or false |
439 | * if unscheduling one or more events fails. |
440 | * |
441 | * @since 5.1.0 |
442 | * |
443 | * @param null|array $pre Value to return instead. Default null to continue unscheduling the hook. |
444 | * @param string $hook Action hook, the execution of which will be unscheduled. |
445 | */ |
446 | $pre = apply_filters( 'pre_unschedule_hook', null, $hook ); |
447 | if ( null !== $pre ) { |
448 | return $pre; |
449 | } |
450 |
|
451 | $crons = _get_cron_array(); |
452 | if ( empty( $crons ) ) { |
453 | return 0; |
454 | } |
455 |
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