How to Check Your WordPress PHP Version (And Why It Matters)
WordPress runs on PHP, the server-side scripting language that powers its core, themes, and plugins. The version of PHP running on your hosting server affects site speed, security, and compatibility with newer WordPress updates. Understanding how to check that version, and what the numbers mean, has become a routine part of maintaining a healthy WordPress installation.
Recent Trends
Over the past several years, the PHP project has shortened its official support windows, and WordPress has gradually raised the minimum PHP version it supports. Many hosts have begun migrating customers to PHP 8.x, while older PHP releases have reached end-of-life and no longer receive security patches. This shift has pushed PHP version checks from an occasional technical task into a regular maintenance step for WordPress site owners.
WordPress core itself has adopted a more cautious approach: it still functions on older versions, but newer features and performance improvements are increasingly designed with modern PHP in mind. The broader ecosystem of plugins and themes is following the same path, making the PHP version a factor in how well your site runs and how often it needs patching.
Background
PHP is executed on the server before pages are delivered to a visitor’s browser. WordPress core, as well as nearly every plugin and theme, is written in PHP. When your WordPress site loads, the server runs all of that code, and the PHP version determines which functions are available and how efficiently the code is processed.
Checking your WordPress PHP version is straightforward. The most common methods include:
- WordPress Site Health: In the WordPress admin, go to Tools > Site Health and open the Info tab. The “Server” section lists the PHP version your site is currently using.
- Hosting control panel: Most hosting providers show the PHP version in cPanel or a custom dashboard, often under “Software,” “PHP Configuration,” or “General Settings.”
- WP-CLI: If you have command-line access, run
wp phpinfoorwp eval 'echo phpversion();'to display the version directly. - Server status file: Create a temporary file such as
phpinfo.phpcontaining<?php phpinfo(); ?>, upload it to the WordPress root directory, and view it in a browser. Remove the file immediately after checking.
Each method gives a clear answer, but the important part is comparing your version against what is considered current and well supported.
User Concerns
WordPress site owners typically worry about three things when the subject of PHP versions comes up: security, compatibility, and performance. An outdated PHP version may expose your site to known vulnerabilities, since older releases stop receiving security updates. It can also prevent WordPress core, plugins, or themes from functioning properly, especially after an update to any of those components.
Compatibility is a major concern because plugin and theme developers often set a minimum PHP version. If your site is below that minimum, you may see warning messages, missing features, or even fatal errors. On the performance side, newer PHP versions often run the same code faster, which can reduce page load times and lower server resource usage without any other optimization.
Another practical concern is future-proofing. Hosting providers sometimes announce that they will end support for certain PHP versions, leaving site owners with a choice between upgrading, changing hosts, or accepting an unsupported environment.
Likely Impact
The impact of running an older PHP version can be felt in several ways. A site on a very old PHP release may load slower because the code is interpreted less efficiently. More importantly, security risks increase when no security patches are being issued. If a vulnerability is found in that PHP version, it remains exploitable until the site is moved to a supported version.
There is also the risk of breakage. WordPress updates and plugin updates are written and tested against newer PHP versions. When you try to run them on an old version, you may encounter white screens, missing admin pages, or plugin conflicts. In some cases, the site becomes inaccessible until the PHP version is updated or the update is rolled back.
For developers and agencies managing multiple WordPress sites, the impact is larger. A portfolio of sites with varying PHP versions means different testing requirements, more maintenance overhead, and constant pressure to coordinate updates across clients. Standardizing on a supported PHP version reduces that complexity.
What to Watch Next
Looking ahead, WordPress is likely to continue aligning its minimum requirements with PHP’s active support lifecycle. That means site owners should watch for PHP releases reaching end-of-life, as well as WordPress announcements about supported versions. Hosting providers will also play a key role, as many are moving to PHP 8 by default and may offer automatic upgrades in the near future.
Plugin and theme developers will gradually raise their minimum PHP requirements, which may force older sites to upgrade even if WordPress core itself still works. It is worth monitoring the changelogs of the plugins you rely on and testing any PHP upgrade on a staging site first.
Finally, the introduction of new PHP features and performance improvements is expected to continue. Site owners who stay on a supported PHP version will be better positioned to take advantage of these advances without unexpected downtime or security gaps. The bottom line: checking your WordPress PHP version is not a one-time task, but a regular part of maintenance that directly affects how secure, fast, and reliable your site will be in the coming months.