How to update PHP in WordPress safely: check your current version under Tools, Site Health, back up your whole site, confirm plugins and theme support the newer PHP version, then switch it in your hosting control panel, not inside WordPress itself. WordPress currently recommends PHP 8.3 or newer; the update itself usually takes just minutes.
Running an outdated PHP version slows every request your site handles, since PHP is the scripting language that builds each WordPress page before it reaches a visitor’s browser. In GEENXT’s own June 2026 technical audit, our homepage measured a time to first byte of roughly 1.3 seconds on an older server stack before optimization work began; server side execution speed, including which PHP version handles that request, is one of the levers behind a number like that. WordPress.org officially recommends PHP 8.3 or greater as a modern, secure baseline, and PHP 8.4 remains the actively supported line receiving regular bug and security fixes.
Why update the PHP version of your WordPress site?
WordPress runs on PHP, so the PHP version your host runs directly shapes both security and speed. Once a PHP release passes its security support window, it stops receiving fixes for newly discovered vulnerabilities, which leaves an outdated WordPress site exposed even if WordPress core itself stays current. Newer PHP versions also execute code faster, so the same theme and plugins run quicker without any other changes. Staying current avoids compatibility issues too: plugin developers test primarily against supported PHP versions, and an old PHP version is a common reason a plugin update fails silently.
Does WordPress use PHP? What version does it need?
Yes, WordPress does use PHP: the entire platform, from the dashboard to every theme and plugin, is written in PHP, and PHP is what turns your site’s files into the page a visitor sees. Running an unsupported PHP on WordPress site is one of the most common gaps GEENXT finds in performance audits. WordPress.org’s official requirements page lists PHP 8.3 or greater as the recommended baseline for performance and security, while PHP 8.4 and the newer PHP 8.5 are currently the actively supported branches, per the official PHP support schedule, still receiving full bug and security fixes. PHP 8.2 has moved into security only support, and older lines like PHP 7.4 are already end of life.
How to check your current PHP version
Before changing anything, confirm the version of PHP you’re running today. In your WordPress dashboard, go to Tools, then Site Health, then open the Info tab and expand the Server section; the PHP version line there shows your current version down to the point release. Note that number so you have something to compare against once the update finishes.
Before you update PHP: 3 safe checks
Three checks first. Back up your entire WordPress site, files and database, so you can restore it if anything goes wrong; most hosts offer a one click backup tool. Next, check your active theme and each installed plugin against the version you’re moving to; many WordPress plugins document their minimum PHP requirement on their plugin page, and a PHP WordPress compatibility checker plugin can scan your whole site in a couple of minutes. Finally, if your host offers a staging copy of your site, test the update there first instead of changing the live wordpress site directly, and repeat this check whenever your host rolls out a newer version.
How to update your WordPress PHP version, step by step
Ready to update your PHP version? The exact screen depends on your web host, but the path is almost always the same:
- Log into your hosting account (not WordPress itself) and look for a section called PHP Selector, MultiPHP Manager, or PHP Settings. Some hosts label this control WordPress PHP version in the panel.
- Select the WordPress recommended baseline, PHP 8.3 or higher, from the list of available versions. Running a PHP 8 WordPress compatibility check first avoids surprises.
- Save the change and give the server a minute to apply the version update.
- Reload your live site and click through a few pages to confirm nothing broke.
- Check plugin and theme settings for any new warnings in the WordPress dashboard.
If you don’t see a PHP option in your hosting panel, ask your web host to make the switch for you: on shared and managed WordPress hosting, this is usually a same day request. This is different from the option to update WordPress itself, sometimes labeled a WordPress update PHP option by mistake, which actually lives under Dashboard, Updates, inside wp-admin.
What to do if the PHP update breaks your site
If your site shows a white screen or a critical error message right after the switch, don’t panic: revert the PHP version back to what it was before in the same hosting panel screen you just used, since that undoes the change in under a minute and buys you time to investigate. Once the site is back up, check your error log (most hosts show this under Metrics or Errors) to find the exact plugin or theme file causing the conflict, deactivate that one item, then try the new version again. If you instead lose access to wp-admin (sometimes searched as a wordpress login php error, where the login screen won’t load at all), the fix is the same: roll back PHP from your host’s control panel, not from inside WordPress, since the dashboard itself may be what’s failing to load. Compatibility issues aren’t limited to plugins either: some older configurations affect wordpress xmlrpc.php requests used by the WordPress mobile app and certain SEO tools, so test those integrations too before calling the update finished.
Recommended PHP versions at a glance
As of this update: PHP 8.4 and PHP 8.5 are actively supported and receiving full bug and security fixes. PHP 8.2 and PHP 8.3 are in security only support, meaning critical fixes but no new features. PHP 7.4 and earlier are already end of life and should not be running on a live wordpress site. WordPress.org recommends PHP 8.3 or greater as a safe, modern baseline.
Frequently Asked Questions
Should you update PHP on WordPress?
Yes, you should update PHP on WordPress unless you have a specific, documented reason not to. WordPress itself will keep running on an old PHP version for a while, but every month past a PHP release’s security support window is a month without official security patches for the language your entire site is built on, which is a real risk for a small business site handling contact forms, logins, or payments. On the performance side, moving from an older PHP release to a currently supported one is one of the few site changes that speeds up every single page load at once, with no plugin or design work required. The only reason to delay is a plugin or theme with a confirmed compatibility issue, in which case the fix is to update that plugin first, not to skip the PHP update indefinitely.
How do I check my PHP version in WordPress?
Open your WordPress dashboard, go to Tools, then Site Health, then the Info tab, and expand Server; your current PHP version is listed there.
What is the latest PHP version for WordPress?
As of this update, PHP 8.5 is the latest version actively supported, though WordPress.org’s official recommended baseline for most sites is PHP 8.3 or greater; check the version notice on your hosting panel before choosing.
Can updating PHP break my WordPress site?
It can, usually because an old plugin or theme relies on code the new PHP version no longer supports. Running a PHP compatibility checker plugin first, and testing on staging if your host offers it, avoids most of these problems.
Is it safe to update PHP in WordPress?
Yes, as long as you back up first. A PHP version update itself only changes how your server runs code; it does not touch your content, and reverting it if something goes wrong takes about a minute in your hosting panel.
Does WordPress use PHP?
Yes. WordPress core, every default theme, and most WordPress plugins are written in PHP, which is why the PHP version your web host runs directly affects how your whole wordpress site performs.
Updating PHP is one lever for a faster WordPress site, but it works best alongside the rest of your performance stack. For the full picture, see our Website Performance guide, then pair a current PHP version with clearing your WordPress cache or one of the best WordPress caching plugins to get the rest of the way to a genuinely fast site.
