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Editor to share with you the Wordpress automatic extraction of the first picture in the content as a thumbnail method, I hope you will learn a lot after reading this article, let's discuss it together!

How does Wordpress automatically extract the first picture in the content as a thumbnail?

Sometimes we publish articles without thumbnails, we want the system to automatically extract the first picture in our published articles as thumbnails, here I will introduce the Wordpress automatic extraction of the content of the first picture as a thumbnail method, students who need to know can refer to.

In php, we can use preg_match and preg_match_all to get the addresses of all the pictures in the content.

Step 1: add the following function to the function.php of the theme template, as follows:

The code is as follows:

/ / the function function catch_that_image () {global $post, $posts; ob_start (); ob_end_clean (); preg_match ('/ / iframes, $post- > post_content, $matche); if ($matche [1]) return $matche [1]; / / otherwise, take the default image return 'default.gif';}

Step 2: use this function directly where wordpress needs to call thumbnails, as in the following example, the code is as follows:

The code is as follows:

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