Question

wp_cron()

Run scheduled callbacks or spawn cron for all scheduled events.

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description

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源代码

File: wp-includes/cron.php

function wp_cron() {
	// Prevent infinite loops caused by lack of wp-cron.php
	if ( strpos($_SERVER['REQUEST_URI'], '/wp-cron.php') !== false || ( defined('DISABLE_WP_CRON') && DISABLE_WP_CRON ) )
		return;

	if ( false === $crons = _get_cron_array() )
		return;

	$gmt_time = microtime( true );
	$keys = array_keys( $crons );
	if ( isset($keys[0]) && $keys[0] > $gmt_time )
		return;

	$schedules = wp_get_schedules();
	foreach ( $crons as $timestamp => $cronhooks ) {
		if ( $timestamp > $gmt_time ) break;
		foreach ( (array) $cronhooks as $hook => $args ) {
			if ( isset($schedules[$hook]['callback']) && !call_user_func( $schedules[$hook]['callback'] ) )
				continue;
			spawn_cron( $gmt_time );
			break 2;
		}
	}
}

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更新日志

Version	description
2.1.0	Introduced.

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相关函数

Uses

• wp-includes/cron.php: _get_cron_array()
• wp-includes/cron.php: wp_get_schedules()
• wp-includes/cron.php: spawn_cron()

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User Contributed Notes

1. Skip to note content You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note Contributed by Codex

   Example
   You should not call wp_cron() yourself, but it allows you to create scheduled events like this.

   
   if ( ! wp_next_scheduled( 'wpdocs_task_hook' ) ) {
   	wp_schedule_event( time(), 'hourly', 'wpdocs_task_hook' );
   }
   add_action( 'wpdocs_task_hook', 'wpdocs_task_function' ); // 'wpdocs_task_hook` is registered when the event is scheduled
   
   /**
    * Send an alert by email.
    */
   function wpdocs_task_function() {
   	wp_mail( 'your@email.com', 'Automatic email', 'Automatic scheduled email from WordPress.');
   }