Best PHP Version for WordPress: How to Choose, Check and Upgrade Safely

What is the best PHP version for WordPress today?

For most WordPress sites today, the best PHP version for WordPress is PHP 8.3 or greater. That is the version WordPress itself recommends on its official requirements page, and it is the safest default choice for a site that needs to stay secure, supported and compatible with current plugins and themes.

PHP 8.4 is also a strong choice when your theme and plugins are up to date and your host supports it well. PHP 8.5 is newer still, so treat it as a version to test carefully first rather than one to switch to on a busy live site without checking compatibility. The right answer is therefore not simply the newest number available. It is the newest version that is recommended, still supported, and proven to work with your particular combination of theme, plugins and WooCommerce setup.

Version support matters here. WordPress 7.0 dropped support for PHP 7.2 and 7.3, according to the official WordPress core handbook, so PHP 7.4 is the lowest version compatible with WordPress 7.0. That does not make 7.4 a good target. It is a floor, not a recommendation. If you are still on PHP 7.4 or older, you are running at or below the minimum for a current WordPress release, and you should plan an upgrade rather than treating the old version as settled.

Always check the current requirements page for the version that matches your WordPress release before you switch, because recommendations and compatibility change as new WordPress and PHP releases arrive. The official sources checked for this guide are the WordPress requirements page, the WordPress core handbook compatibility table, and the PHP supported-versions page.

A simple way to choose

• PHP 8.3: the recommended baseline. Choose this if you want the most widely tested, low-risk upgrade.
• PHP 8.4: a good next step if your plugins and theme are current and your staging test is clean.
• PHP 8.5: the newest branch. Test it thoroughly on staging first, especially for older or less actively maintained plugins.
• PHP 7.4: the minimum for WordPress 7.0, but not a long-term home. Plan to move up.
• Older than PHP 7.4: not compatible with WordPress 7.0. Do not stay here.

Why the PHP version matters

PHP is the language WordPress runs on, so the version you use affects both security and performance. A supported PHP version still receives security fixes, while an unsupported version does not, which leaves known problems unpatched. That is a direct security risk, not just a technical detail.

Performance is the other reason to care. Newer PHP versions are built to handle WordPress requests more efficiently than very old ones, so an upgrade can remove a server-side bottleneck. It will not, on its own, fix a heavy theme, unoptimized images, slow database queries or missing caching. Think of PHP as the foundation: a modern foundation helps everything else work better, but it does not replace good caching, clean code and a sensible hosting setup. If you are also working through speed problems, our WordPress Core Web Vitals guide and our Best WordPress Cache Plugins Review are useful next reads.

How do I check my PHP version?

Checking takes less than a minute, and you should do it before you change anything. There are two reliable places to look, and they should agree.

In WordPress: Site Health

1. In your WordPress dashboard, go to Tools > Site Health.
2. Click the Info tab.
3. Open the Server section.
4. Look for the PHP version listed there.

Site Health also flags other useful issues, so it is worth reading the whole report rather than only glancing at the PHP number. If Site Health reports an outdated PHP version, treat that as a prompt to plan the upgrade in the order below, not as a reason to switch versions on live traffic immediately.

In your hosting panel

Your hosting panel usually shows the PHP version under a PHP, software or server-settings section, and that is also where you will change it later. The exact label varies by host, but look for PHP version, PHP settings or Select PHP version. Write down the current version before you change it, so you know exactly which version to roll back to if anything goes wrong.

If the two places disagree, trust the hosting panel for what the server is configured to use, and check whether you are looking at a staging site rather than the live site. Staging and live sites can run different PHP versions, and that difference is exactly what you want to test before a live switch.

How do I update PHP safely?

Do not start by changing the PHP version on your live site. The safe order matters more than the version number itself, because it gives you a backup, a test copy and a way back.

1. Take a full backup. Back up files and the database, and confirm you know how to restore it. A backup you have never tested is only a hope, not a safety net.
2. Update WordPress core, plugins and themes first. Outdated code is the most common cause of PHP compatibility problems. Update on staging first if you can, then on live, and check the site still works normally.
3. Test on staging. Copy the live site to staging, switch PHP there, and click through the site as a visitor would.
4. Switch PHP in the hosting panel. Choose the target version, save, and wait for the change to apply. Some hosts apply it immediately; others take a few minutes.
5. Check the site carefully. Visit the home page, key landing pages, blog posts, contact forms and, for a store, the full checkout. Check the admin area, and review error logs if your host provides them.
6. Keep the old version available as rollback. Do not delete your backup or forget the previous PHP version. If a problem appears later, you need a fast way back while you fix the cause.

After the switch, retest speed with a trusted tool rather than assuming the change helped or hurt. Our Best WordPress Speed Test Tools guide explains how to test consistently, and if you use server-level caching, our Redis Object Cache guide explains a separate layer that can help database-heavy sites.

WooCommerce caution

For a store, the stakes are higher because a broken checkout costs orders. Before switching PHP on a live store, test the full checkout on staging: add products to the cart, apply a coupon if you use one, complete a test order, and check order emails and payment confirmation. Also review any custom checkout, shipping or payment plugins, because those are the parts most likely to behave differently. For related store performance work, see our WooCommerce Cache Exclusions guide, which explains why cart and checkout pages need special handling.

If you are unsure about staging, backups or rollback on a store, pause and get help before switching. A short delay is far cheaper than a checkout outage.

What if a plugin or theme breaks after a PHP update?

First, do not panic and do not start changing several things at once. In most cases, WordPress core itself is not the problem. An older plugin or theme that uses code removed or changed in the new PHP version is the usual cause, which is why the update order above starts with updating everything first.

If you see a blank page, a fatal error or a broken feature after the switch, roll back to the previous PHP version in your hosting panel. That should restore the site while you investigate. Then, on staging, update or replace the suspect plugin or theme, check its changelog for PHP compatibility, and test again. If a plugin has not been updated in a long time and has no compatible replacement version, replacing it is often safer than trying to patch old code yourself.

Use error logs and a debugging tool to narrow the cause instead of guessing. Our Query Monitor tutorial shows how to spot slow queries, PHP errors and problematic plugins. Note the exact error message, the plugin or theme named in it, and the page where it happens. That detail makes it much easier for a developer or host support team to help.

Only move forward again when staging passes the same checks you used before: home page, key pages, forms, admin area and, for a store, the full checkout. If you cannot identify the cause, stay on the previous working PHP version, keep your backup safe, and get expert help rather than leaving the site broken on the new version.

If you would rather not test a PHP change on a live business site alone, or if your site is already slow after an upgrade, ask for a free speed audit and get a clear, honest next step before making another server change.

Common Questions

Frequently Asked Questions

Clear, honest answers about choosing, checking, and upgrading the PHP version safely.