Changing PHP version can make WordPress faster and more secure, but it can also expose old plugin or theme code. The right approach is to test first, change deliberately, and keep a rollback path.
Why PHP Version Matters
WordPress is written in PHP. Your PHP version affects performance, security support, available language features, and compatibility with plugins. Older PHP versions may keep an old site running, but they are not a good long-term home for production websites.
Check WordPress, Theme, and Plugins
Before changing PHP, update WordPress core, then review your theme and plugins. Remove anything unused. Check plugin changelogs if a site depends on older code, especially page builders, ecommerce plugins, membership systems, and custom integrations.
Use Staging First
If staging is available, copy the site and change PHP there first. Test the admin area, frontend pages, forms, checkout, scheduled tasks, and any custom plugin features. A homepage-only check is not enough.
Watch for Common Breakages
- Fatal errors from old plugins.
- Warnings or notices exposed on the page.
- Forms that stop sending.
- Checkout or payment callbacks failing.
- Cron jobs using a different PHP version from the website.
Change PHP in Enhance
In Enhance, open the website and go to Advanced → Developer tools → PHP. Select the version you want to test, save the change, and then clear any site cache. If something breaks, switch back while you investigate.
Do Not Ignore CLI PHP
Some applications use cron jobs. If the cron command calls a different PHP binary, the website might run one PHP version while scheduled tasks run another. That can cause confusing errors. Check the cron command after changing PHP.
After the Change
Check logs for errors, run through important workflows, and leave monitoring in place for a while. If the site is business-critical, make the change during a quiet period and take a backup first.
If you are unsure whether a WordPress site is ready for a PHP version change, open a support ticket and we can help review it.
Hosting Features That Make PHP Changes Easier
Choose hosting that lets you change PHP per site, not only per account. TekLan shared hosting and application hosting both use Enhance, so each website can have its own PHP version and extensions.
That matters when you host several sites. One older WordPress install should not hold every other site back. It also makes staged upgrades easier because you can test one site, fix issues, then move on to the next.
Internal Checks Before Upgrading
- Take a fresh file and database backup.
- Check the active theme and business-critical plugins first.
- Confirm cron commands use the expected PHP binary.
- Review error logs after the change.
- Keep notes so the next upgrade is faster.
Related posts: using staging safely, PHP memory limits explained, and why websites get slow.
