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HomeBackend DevelopmentPHP Tutorial调试WordPress中定时任务的相关PHP脚本示例_PHP

一般人们使用WordPress的Cron API来实现定时任务,它的原理就是将创建的定时任务存储到数据库里,当有人访问的时候就去判断一下是否到时间需要执行这个定时任务,如果到时间则执行。

因为这种原理,所以执行的时间可能会有一些偏差,但随着网站的浏览量攀升和网络爬虫的不断访问,会让定时任务执行的时间越来越准确。

想在 WordPress 里创建一个定时任务一般用两个函数就行,其中之一是wp_schedule_event()

wp_schedule_event( $timestamp, $recurrence, $hook, $args );

使用这种方法的这样一个定时任务被开启,就会一直执行下去,除非手动把定时任务关闭掉。

当你开启一个定时任务之后,很难进行调试,因为定时任务并不是每次刷新网页都会执行。这种情况下,代码的错误和 Bug 很难被一下发现。

有一种方法,可以帮助你进行调试。这种方法就是访问 http://你的域名.com/wp-cron.php?doing_wp_cron,访问的时候所有的定时任务都会被执行一次,这样就可以很方便的调试了。

http://www.example.com/wp-cron.php?doing_wp_cron

关闭定时任务

如果你要禁用定时任务,可以在 wp-config.php 里添加下边的代码:

/**
  *WordPress 禁用定时任务
  *http://www.endskin.com/debug-cron/
*/
define( 'DISABLE_WP_CRON', true );

调整执行频率

很多人都说定时任务有一个非常讨厌的设计,那就是只能设置三种任务执行频率,分别是 hourly (每小时执行一次)、twicedaily (每天执行两次,也就是 12 小时执行一次)和 daily (24 小时执行一次),如果要其它的执行频率就没有办法。

那 WordPress 就真不支持自定义定时任务的执行频率吗?答案是否定的,WordPress 支持自定义定时任务的执行频率,但是比较麻烦,需要使用钩子修改。

下边的代码我添加了一个新的任务执行频率,叫做 weekly,执行频率为每周执行一次:

function Bing_add_schedules( $schedules ){
  $schedules['weekly'] = array(
    'interval' => 604800,//以秒为单位的执行频率
    'display' => __( '每周一次' )//显示在前端的名字
  );
  return $schedules;
}
add_filter( 'cron_schedules', 'Bing_add_schedules' );

之后这个创建的执行频率就可以在 wp_schedule_event() 函数上使用了:

wp_schedule_event( current_time( 'timestamp' ), 'weekly', 'test' );
总结:用 cron_schedules 钩子可以添加更多的执行频率,实现自定义定时任务执行频率的目的。

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