Why it's important to know about PHP version compatibility, where to find information about PHP version updates, and how to test your plugins and themes to see if they support the latest PHP version in two ways. Why Test for PHP Version Compatibility? WordPress is written in the PHP language, which means it needs to run smoothly on the version of PHP supported by your web host. While WordPress will recommend a minimum PHP version requirement, older versions of PHP will gradually stop being updated or even cease to...