How to Check WordPress Plugin & PHP Compatibility Before Updating

Updating a WordPress plugin can break your site if the new version requires a newer PHP version than your server runs, or if it conflicts with your theme or other plugins. This guide shows you how to check plugin and PHP compatibility before you hit “Update,� so you can avoid white screens, fatal errors, and downtime.

What You’ll Need

• Access to your WordPress admin dashboard (at least an Administrator role).
• Ability to view your site’s PHP version (usually in Tools → Site Health or your hosting control panel).
• A staging site or a full backup (recommended, but not strictly required for checking compatibility).

Step-by-Step

1. Check your current PHP version. In WordPress, go to Tools → Site Health → Info and look under “Server� for the PHP version. Alternatively, your hosting panel (cPanel, Plesk, etc.) shows it. Write it down.
2. Check the plugin’s “Requires PHP� field. In your admin, go to Plugins → Installed Plugins. Find the plugin you want to update. The “Requires PHP� column shows the minimum PHP version the plugin needs. If it’s higher than your server’s PHP, do not update yet.
3. Check the plugin’s “Tested up to� WordPress version. On the same row, “Tested up to� tells you the latest WordPress version the plugin author has tested. If it’s lower than your WordPress version, the update might still work, but proceed with caution.
4. Visit the plugin’s page on WordPress.org. Search for the plugin in the official repository. Look at the “Compatibility� section (usually on the right sidebar) which shows a grid of WordPress versions and PHP versions that the plugin is tested against. If your PHP version is not listed, treat it as untested.
5. Read the changelog. On the same page, click “Development� or “Changelog� to see what changed in the new version. Look for notes like “Requires PHP 7.4� or “Dropped support for PHP 5.6.� If the changelog mentions a PHP requirement increase, that’s a red flag.
6. Check for known compatibility issues. Search the plugin’s support forum on WordPress.org for the version number you’re about to install. Look for threads like “Version 2.0 breaks my site� or “Fatal error with PHP 8.� If there are recent unresolved issues, wait.
7. Use a staging site to test. If you have a staging environment (most managed hosts offer one), update the plugin there first. If the staging site works fine, you can safely update on your live site. If you don’t have staging, skip to the next step.
8. Take a full backup. Before any update, back up your entire site (files and database). Use a plugin like UpdraftPlus or your host’s backup tool. Store the backup off-site.
9. Update the plugin. If all checks pass, go to Plugins → Installed Plugins, click “Update Now� under the plugin. After the update, immediately check your site’s front end and admin dashboard for errors.
10. Test key functionality. Click through the pages that use that plugin. If it’s a contact form, submit a test message. If it’s an e-commerce plugin, add a product to cart. If anything looks broken, you know to roll back.

Common Mistakes

• Ignoring the “Requires PHP� field. Many users update a plugin and then get a fatal error because their PHP is too old. Always check this first.
• Assuming “Tested up to� means “works with.� It only means the author tested with that version; it doesn’t guarantee compatibility with your specific setup.
• Updating multiple plugins at once. If something breaks, you won’t know which plugin caused it. Update one at a time.
• Not checking the changelog. A minor version bump might still include a PHP requirement change. Always read what changed.
• Skipping backups. Even with all checks, an update can fail. A backup is your safety net.

Tips

• Keep your PHP version up to date. PHP 8.0 and above are much faster and more secure. If your host supports it, upgrade your PHP version (after testing on staging) to avoid compatibility issues.
• Use a plugin like “PHP Compatibility Checker� to scan your entire site for plugins that might not work with a newer PHP version. This is useful before you upgrade PHP, not just before a plugin update.
• Enable WordPress debugging. Add define('WP_DEBUG', true); to your wp-config.php file. This will show PHP errors on screen, which helps you identify issues after an update.
• Check your server’s PHP error log. If you get a white screen after an update, the error log will tell you exactly what went wrong.
• Set up automatic backups. Many hosts offer daily backups. If not, schedule a weekly backup with a plugin.

Troubleshooting

What if the update causes a fatal error?

If you see a white screen or “There has been a critical error on your website,� you need to roll back. Access your site via FTP or file manager, navigate to wp-content/plugins/, and rename the plugin’s folder (e.g., plugin-name to plugin-name-old). This deactivates the plugin. Then restore the previous version from your backup.

What if the plugin works but the site is slow?

Check the plugin’s changelog for performance improvements. If it’s slower, it might be a conflict with another plugin. Deactivate other plugins one by one to isolate the issue. If the problem persists, consider switching to a different plugin.

What if the plugin requires a PHP version you don’t have?

You have three options: update PHP on your server (if your host allows), find an alternative plugin that works with your current PHP, or skip the update. Staying on an old plugin version can be a security risk, so updating PHP is usually the best long-term solution.

What if the update succeeds but the plugin’s settings are lost?

Some plugins store settings in the database, and updates usually preserve them. If not, you may need to reconfigure. Always export plugin settings before an update if the plugin offers that option.

Frequently Asked Questions

How do I find out my WordPress PHP version?

Go to Tools → Site Health → Info and look under “Server.� The PHP version is listed there. Your hosting control panel also shows it.

What does “Requires PHP� mean in the plugin list?

It’s the minimum PHP version the plugin needs to run. If your server’s PHP is lower, the plugin may not work or may cause errors.

Can I update a plugin that says “Tested up to� an older WordPress version?

It might work, but it’s not guaranteed. Check the plugin’s support forum for any reports of issues with your WordPress version. If in doubt, test on a staging site first.

What is a staging site and why do I need one?

A staging site is a clone of your live site where you can test updates without affecting visitors. It’s the safest way to check compatibility because you can see if anything breaks before you make it live.

How do I roll back a plugin update?

If you have a backup, restore the plugin folder from it. If you don’t, you can download the previous version from WordPress.org (under “Advanced View� on the plugin page) and manually upload it via FTP.

Should I update PHP before updating plugins?

It’s often better to update PHP first, because newer PHP versions are faster and more secure, and most modern plugins are built for PHP 8. However, test your site on staging after the PHP upgrade to catch any issues.

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