WP Rocket has been backward compatible to WordPress 3.1 since version 1.0. We designed the plugin for almost everyone, even if you can’t update your website. Similarly, WordPress itself is backward compatible to PHP 5.2.4. What is Backward Compatibility? In cases where one piece of software relies on another piece of software (or other component) in order to function – such as how WordPress relies on PHP – backward compatibility means that you can still use a piece of software even if the other required components are not updated to the latest version. So you can still run WordPress even if your version of PHP is not up-to-date. Likewise you can still run WP Rocket even if your version of WordPress is not the absolute latest. The goal, when you develop something with backward compatibility in mind, is that your product/service can be used by more people, even if they’re not using the latest components your product may require. Sounds Reasonable, But Why is it Not a Good Idea? It sounds good – more people means more customers – all you have to do is to be sure that your code can be used in many previous versions and you have to find a fallback function or something to “patch” this lack.
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