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This article mainly introduces php how to debug WordPress timing tasks, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

Generally, people use WordPress's Cron API to implement scheduled tasks, its principle is to store the created scheduled tasks in the database, and when someone visits it, they judge whether it is time to execute the scheduled tasks, and if it is time to execute them.

Because of this principle, there may be some deviation in the execution time, but with the increase in the number of page views of the website and the continuous visit of web crawlers, the execution time of scheduled tasks will become more and more accurate.

To create a scheduled task in WordPress, you usually use two functions, one of which is wp_schedule_event ()

Wp_schedule_event ($timestamp, $recurrence, $hook, $args)

When such a scheduled task using this method is turned on, it will continue to be executed unless the scheduled task is turned off manually.

When you start a scheduled task, it is difficult to debug, because the scheduled task is not executed every time the page is refreshed. In this case, errors in the code and Bug are difficult to detect at once.

There is a way to help you debug. The way to do this is to visit http:// your domain .com / wp-cron.php?doing_wp_cron, and all scheduled tasks will be executed once during the visit, which makes it easy to debug.

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

Turn off scheduled tasks

If you want to disable scheduled tasks, add the following code to wp-config.php:

/ * * WordPress disables scheduled tasks * http://www.endskin.com/debug-cron/*/define( 'DISABLE_WP_CRON', true)

Adjust the execution frequency

Many people say that scheduled tasks have a very annoying design, that is, you can only set three task execution frequencies, namely, hourly (once an hour), twicedaily (twice a day, that is, once every 12 hours), and daily (once every 24 hours). There is no way to do anything else.

Does WordPress really not support customizing the execution frequency of scheduled tasks? The answer is no. WordPress supports customizing the execution frequency of scheduled tasks, but it is troublesome and needs to be modified with hooks.

In the following code, I added a new task execution frequency, called weekly, which is executed once a week:

Function Bing_add_schedules ($schedules) {$schedules ['weekly'] = array (' interval' = > 604800 execution frequency in seconds' display' = > _ (once a week) / / the name shown at the front end); return $schedules;} add_filter ('cron_schedules',' Bing_add_schedules')

The execution frequency of this creation can then be used on the wp_schedule_event () function:

Wp_schedule_event (current_time ('timestamp'),' weekly', 'test')

Thank you for reading this article carefully. I hope the article "how to debug scheduled tasks in WordPress" shared by the editor will be helpful to everyone. At the same time, I also hope that you will support and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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