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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 |
|---|---|
| 307 | * An object containing an event's data. |
| 308 | * |
| 309 | * @type string $hook Action hook to execute when the event is run. |
| 310 | * @type int $timestamp Unix timestamp (UTC) for when to next run the event. |
| 311 | * @type string|false $schedule How often the event should subsequently recur. |
| 312 | * @type array $args Array containing each separate argument to pass to the hook's callback function. |
| 313 | * @type int $interval The interval time in seconds for the schedule. Only present for recurring events. |
| 314 | * } |
| 315 | */ |
| 316 | $pre = apply_filters( 'pre_reschedule_event', null, $event ); |
| 317 | if ( null !== $pre ) { |
| 318 | return $pre; |
| 319 | } |
| 320 | |
| 321 | // Now we assume something is wrong and fail to schedule. |
| 322 | if ( 0 == $interval ) { |
| 323 | return false; |
| 324 | } |
| 325 | |