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This article is about how to avoid endless loops when WordPress uses hooks for theme development. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

When WordPress uses hooks for theme development to avoid endless loop WordPress development, we often use hooks such as save_post or create_post_tag to add some additional data when updating articles or categories. These hooks are triggered when the data is published or updated. If not handled properly, there will be an endless loop, resulting in an endless loop when updating data.

For example, when we save an article, we need to hang it on a function on the save_post hook. The purpose of this function is to modify the title of the article by adding the name of the author in front of the title of the article. We display this change by calling the wp_update_post function. The sample code is as follows.

Add_action ('save_post',' wprs_update_post'); function wprs_update_post ($post_id) {$title = get_the_title ($post_id); $title = "one knife:". Title; $args = ['ID' = > $post_id,' post_title' = > $title,]; wp_update_post ($args);}

In the above code, the "save_post" hook occurs during the call to the wp_update_post function. Through the "save_post" hook, we call the wp_update_post function, and in this function, we run the "save_post" hook. As a result, the program ran tirelessly.

Experienced programmers may easily find this problem, but the computer does not know that this is an endless cycle, we can not blame the computer, after all, it is just a mindless machine. What we can do is to be as careful as possible in the development process to avoid an endless loop.

So, how to solve this endless cycle in WordPress? Actually, the method is very simple.

How to avoid the endless cycle in WordPress

Or the above code, we make a few changes, we can perfectly avoid this endless loop. The following is the modified code. Compared to the code with an endless loop above, we have only added two lines.

Add_action ('save_post',' wprs_update_post'); function wprs_update_post ($post_id) {/ / get the article title and add the author $title = get_the_title ($post_id) before the article title; $title = "one knife:". $title; $args = ['ID' = > $post_id,' post_title' = > $title,]; / / update article remove_action ('save_post',' wprs_update_post'); wp_update_post ($args); add_action ('save_post',' wprs_update_post');}

The principle is very simple: before running the "wp_update_post" function, we uninstall the function that hangs on the "save_post" hook and causes a dead loop, so that there will be no repeated execution of the "wprs_update_post" function. After updating the article, we will mount the hook for later use.

If you encounter an endless loop problem during WordPress development, you might as well refer to the above code to modify it so that you can achieve the functionality we need without causing the problem of an endless loop.

Thank you for reading! This is the end of the article on "how to avoid an endless loop when WordPress uses hooks for theme development". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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