WordPress: PHP 8 Compatibility Checker
Unfortunately, there is no reliable PHP 8.1 Compatibility Checker for WordPress or in general. How to best proceed with the PHP migration and during testing is explained here.
How can I find out whether my website supports PHP 8.1?
Since you can usually switch the PHP version back and forth quite quickly in your hosting panel, the best approach is to try it out! :-)
Afterwards, test the most important functions of your website.
When troubleshooting, it can be helpful to enable debug mode in the wp-config.php file. Ideally, you should have the errors written to the log file using WP_DEBUG_LOG .
define( 'WP_DEBUG', true );
define( 'WP_DEBUG_DISPLAY', false );
define( 'WP_DEBUG_LOG', true );
The log file is saved under /wp-content/debug.log.
Important: For security reasons, you should delete debug.log after successfully analyzing the errors and disable WP_DEBUG again.
There was a PHP Compatibility Checker for PHP 7.4, but it worked only poorly and was not further developed for PHP 8.
If a migration by trial and error is not possible or turns out to be more difficult, for example because a required theme or plugin is not available in a version compatible with PHP 8, we will be happy to help you.
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- Last Updated: 27 February 2023
