wp_reschedule_event()
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概述
wp_reschedule_event() 函数用于重新安排一个已存在的重复事件的执行时间,主要供内部使用。它基于事件的上次运行时间戳和指定的重复频率,计算并设置下一次运行时间。
关键要点
- 函数主要用于内部处理,开发者通常使用 wp_schedule_event() 来修改未来事件的调度。
- 参数包括:$timestamp(事件上次调度的 Unix 时间戳,UTC)、$recurrence(重复频率,值参考 wp_get_schedules())、$hook(事件触发时执行的动作钩子)、$args(传递给回调函数的参数数组,可选)、$wp_error(失败时是否返回 WP_Error,可选)。
- 返回值:成功时返回 true,失败时返回 false 或 WP_Error(取决于 $wp_error 参数)。
- 函数内部通过 'pre_reschedule_event' 过滤器允许插件覆盖重调度过程,并处理时间戳计算以确保事件在正确时间运行。
代码示例
function wp_reschedule_event( $timestamp, $recurrence, $hook, $args = array(), $wp_error = false ) {
// 确保时间戳是正整数
if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) {
if ( $wp_error ) {
return new WP_Error( 'invalid_timestamp', __( 'Event timestamp must be a valid Unix timestamp.' ) );
}
return false;
}
// 其他代码...
}注意事项
- 时间戳应为 UTC 时间,且必须是正整数,否则函数可能返回错误。
- 重复频率需通过 wp_get_schedules() 获取有效值,否则可能导致调度失败。
- 使用 'pre_reschedule_event' 过滤器时,插件可以返回 true、false 或 WP_Error 来中断正常重调度流程。
原文内容
Reschedules a recurring event.
Description
Mainly for internal use, this takes the Unix timestamp (UTC) of a previously run recurring event and reschedules it for its next run.
To change upcoming scheduled events, use wp_schedule_event() to change the recurrence frequency.
Parameters
$timestampintrequired-
Unix timestamp (UTC) for when the event was scheduled.
$recurrencestringrequired-
How often the event should subsequently recur.
See wp_get_schedules() for accepted values. $hookstringrequired-
Action hook to execute when the event is run.
$argsarrayoptional-
Array containing arguments to pass to the hook’s callback function. Each value in the array is passed to the callback as an individual parameter.
The array keys are ignored.Default:
array() $wp_errorbooloptional-
Whether to return a WP_Error on failure.
Default:
false
Source
function wp_reschedule_event( $timestamp, $recurrence, $hook, $args = array(), $wp_error = false ) {
// Make sure timestamp is a positive integer.
if ( ! is_numeric( $timestamp ) || $timestamp <= 0 ) {
if ( $wp_error ) {
return new WP_Error(
'invalid_timestamp',
__( 'Event timestamp must be a valid Unix timestamp.' )
);
}
return false;
}
$schedules = wp_get_schedules();
$interval = 0;
// First we try to get the interval from the schedule.
if ( isset( $schedules[ $recurrence ] ) ) {
$interval = $schedules[ $recurrence ]['interval'];
}
// Now we try to get it from the saved interval in case the schedule disappears.
if ( 0 === $interval ) {
$scheduled_event = wp_get_scheduled_event( $hook, $args, $timestamp );
if ( $scheduled_event && isset( $scheduled_event->interval ) ) {
$interval = $scheduled_event->interval;
}
}
$event = (object) array(
'hook' => $hook,
'timestamp' => $timestamp,
'schedule' => $recurrence,
'args' => $args,
'interval' => $interval,
);
/**
* Filter to override rescheduling of a recurring event.
*
* Returning a non-null value will short-circuit the normal rescheduling
* process, causing the function to return the filtered value instead.
*
* For plugins replacing wp-cron, return true if the event was successfully
* rescheduled, false or a WP_Error if not.
*
* @since 5.1.0
* @since 5.7.0 The `$wp_error` parameter was added, and a `WP_Error` object can now be returned.
*
* @param null|bool|WP_Error $pre Value to return instead. Default null to continue adding the event.
* @param object $event {
* An object containing an event's data.
*
* @type string $hook Action hook to execute when the event is run.
* @type int $timestamp Unix timestamp (UTC) for when to next run the event.
* @type string $schedule How often the event should subsequently recur.
* @type array $args Array containing each separate argument to pass to the hook's callback function.
* @type int $interval The interval time in seconds for the schedule.
* }
* @param bool $wp_error Whether to return a WP_Error on failure.
*/
$pre = apply_filters( 'pre_reschedule_event', null, $event, $wp_error );
if ( null !== $pre ) {
if ( $wp_error && false === $pre ) {
return new WP_Error(
'pre_reschedule_event_false',
__( 'A plugin prevented the event from being rescheduled.' )
);
}
if ( ! $wp_error && is_wp_error( $pre ) ) {
return false;
}
return $pre;
}
// Now we assume something is wrong and fail to schedule.
if ( 0 === $interval ) {
if ( $wp_error ) {
return new WP_Error(
'invalid_schedule',
__( 'Event schedule does not exist.' )
);
}
return false;
}
$now = time();
if ( $timestamp >= $now ) {
$timestamp = $now + $interval;
} else {
$timestamp = $now + ( $interval - ( ( $now - $timestamp ) % $interval ) );
}
return wp_schedule_event( $timestamp, $recurrence, $hook, $args, $wp_error );
}
Hooks
- apply_filters( ‘pre_reschedule_event’, null|bool|WP_Error $pre, object $event, bool $wp_error )
-
Filter to override rescheduling of a recurring event.
Changelog
| Version | Description |
|---|---|
| 5.7.0 | The $wp_error parameter was added. |
| 5.1.0 | Return value modified to boolean indicating success or failure, ‘pre_reschedule_event’ filter added to short-circuit the function. |
| 2.1.0 | Introduced. |