WordPress: PHP 8 Compatibility Checker
Unfortunately, there is no reliable PHP 8.1 compatibility checker for WordPress in general. Here you can find out the best way to approach the PHP migration and testing.
How can I tell whether my website supports PHP 8.1?
Since you can usually switch the PHP version in your hosting panel pretty quickly, just try it! :-)
Then test the most important functions of your website.
When troubleshooting, it can be helpful to activate debug mode in wp-config.php. It's best to have errors written to the log file via WP_DEBUG_LOG.
define( 'WP_DEBUG', true );
define( 'WP_DEBUG_DISPLAY', false );
define( 'WP_DEBUG_LOG', true );
The log file is stored at /wp-content/debug.log.
Attention: For security reasons, you should delete the debug.log after successfully troubleshooting and disable WP_DEBUG again.
There was a PHP Compatibility Checker for PHP 7.4, but it works only poorly and was not developed further for PHP 8.
If switching over on a trial-and-error basis 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'll be happy to help you.
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- Last Updated: 27 February 2023
