Compatibility with PHP 8.1?

Hello Fritex,

Thanks for reaching out regarding the compatibility between the Yoast SEO plugin and PHP 8.1. Unfortunately, we haven’t yet fully tested the plugin with PHP version 8. The entire WordPress community is still working on it. You can read the https://developer.yoast.com/blog/the-2020-wordpress-and-php-8-compatibility-report/.

For Yoast SEO to run properly, you should have a PHP version of 5.6.20 or higher. In fact, we recommend PHP version 7.3 or above. Before you upgrade to a higher PHP version, check if your WordPress site is ready for it. Read this helpful article to learn how to update your PHP version. Also, your PHP memory should be 256M or greater.

Thank you.