A WordPress PHP version update can be routine, but it should not be treated like a switch you flip without preparation. PHP runs much of the server-side code that WordPress, themes, plugins, and custom features depend on. Before changing versions, identify what the site uses now, confirm that its important components are ready, create a recoverable backup, and decide how you will test the site afterward.
The safest approach is to separate preparation from the actual PHP change. That way, if something breaks, you have a much smaller list of possible causes and a clear path back to the last working state.
Start by finding the PHP version the site uses now
Do not begin with the version you want to install. Begin with the version the website is actually running. In WordPress, the Site Health information screen can show server details, including PHP information. Your hosting account may also show the active PHP version.
Write down the current version before changing anything. If the host lets you switch versions, also confirm whether the previous version will still be available afterward. A rollback option is much more useful when you know it exists before a problem appears.
This check fits naturally into a broader WordPress website maintenance routine, because server software should be reviewed alongside WordPress core, themes, plugins, backups, and other parts of the site that need periodic attention.
Update WordPress components before you change PHP
An older theme or plugin may contain code that was written for an older server environment. Before changing PHP, review WordPress core, the active theme, and the plugins the site depends on. Update supported components carefully, then verify that the website still works correctly on the current PHP version before making the next change.
This sequence matters because changing several layers at once makes troubleshooting harder. If you update WordPress, replace a plugin, change the theme, and switch PHP in one session, a broken feature could have several possible causes. Smaller, controlled steps create a clearer change history.
Pay particular attention to older plugins, custom themes, custom snippets, page builders, ecommerce extensions, booking tools, membership features, and integrations that connect WordPress to outside services. Those are the areas where compatibility testing often matters most.
Create a backup you can actually use
A backup is part of the preparation, not an afterthought. For WordPress, the useful backup is the one that contains what you would need to restore the working site if the PHP change exposed a serious compatibility problem.
- Website files: WordPress core files, themes, plugins, uploads, and relevant configuration files.
- Database: Posts, pages, settings, plugin data, users, and other stored site information.
- Recovery access: The hosting, backup, or server access needed to restore the site if WordPress itself becomes difficult to use.
If you have never restored the site from a backup, do not assume that seeing a recent backup date means the recovery process is understood. Know where the backup is stored, how it would be restored, and who has permission to do it.
Use staging when the website is business-critical
A staging site is a separate copy of the website where you can test a technical change without making the live site the experiment. It is especially useful when the site depends on forms, custom code, ecommerce, membership tools, bookings, or multiple plugins that must continue working together.
For a simple site, a careful backup and a low-traffic maintenance window may be enough. For a site that generates leads or supports important customer actions, staging gives you a safer place to discover compatibility problems before visitors encounter them.
If an earlier update has already caused trouble, the guide on what to do when WordPress breaks after an update provides a useful troubleshooting mindset: identify the change, restore stability when necessary, and isolate the failing layer instead of making several new changes at once.
Test the functions that matter, not only the homepage
A homepage that loads correctly does not prove the PHP change was harmless. Some compatibility problems appear only when a specific plugin runs, a form submits, an administrator saves a page, or a customer reaches a checkout or account screen.
Build a short test list before the change. Include the functions that would matter most if they failed:
- Main navigation and important page templates.
- Contact, quote, booking, or registration forms.
- WordPress login and common administrator screens.
- Page editing and saving.
- Search, filtering, or custom interactive features.
- Ecommerce cart, checkout, account, and payment steps when applicable.
- Scheduled tasks, integrations, or custom code that the business depends on.
The same principle applies to a local-service site with many important landing pages. If you manage a page such as website design in Owatonna, test the page itself plus its navigation, calls to action, forms, and any shared template elements after the server change.
Change one major variable at a time
When you are ready to switch PHP, avoid bundling unrelated work into the same release. Do not use the same maintenance window to change DNS, move hosting, replace the theme, install several new plugins, and change PHP unless those changes are part of a planned migration with a tested rollback process.
One-variable-at-a-time work makes failures easier to diagnose. If the site breaks immediately after only the PHP version changes, you have a strong clue about where to investigate. If ten things changed, that clue disappears.
After the switch, clear only the caches that need to be cleared, then repeat the test list you prepared earlier. Check both the public site and the WordPress dashboard. If a critical feature fails, use the rollback plan before experimenting with unrelated fixes on the live site.
Watch for compatibility symptoms after the change
Compatibility problems do not always look like a completely blank website. A PHP change can expose narrower problems that affect only one feature or one admin workflow.
- A form submits but does not complete its normal action.
- A page builder or editor fails to save.
- A plugin screen displays an error.
- A custom feature disappears or stops responding.
- An automated task no longer runs as expected.
- The front end works, but the administrator area becomes unstable.
Record the exact symptom, the page or screen where it appears, and the action that triggers it. Specific observations are more useful than a general statement that the site is broken.
Do not use a PHP update as a substitute for website security
Keeping the server environment current is one part of maintenance, but it does not replace the rest of the security work a WordPress site needs. Strong account access, maintained plugins and themes, reliable backups, limited administrator privileges, and routine review still matter.
The WordPress security checklist for small businesses covers several of those surrounding controls. Treat the PHP update as one layer in a larger maintenance process rather than a single change that makes the site safe by itself.
Frequently asked questions about WordPress PHP updates
Will changing the PHP version change my website content?
The PHP version does not rewrite your posts, pages, or media simply because it changes. The risk is compatibility: older theme, plugin, or custom code may behave differently or fail under a newer PHP environment. That is why backups and testing belong in the process.
Should I update PHP before or after updating WordPress plugins?
For many sites, it is easier to update supported WordPress components first, verify that the site still works, and then change PHP as a separate step. The important point is to avoid stacking several major changes together without testing between them.
What should I do if the site breaks immediately after the PHP change?
If the host allows it and the problem is serious, returning to the previously working PHP version can restore stability while you investigate. Then isolate the incompatible theme, plugin, or custom code on staging or in a controlled troubleshooting process before trying the server change again.
Make the change only after you know how you will verify it
A WordPress PHP version update is easier to manage when the plan is written before the switch: record the current version, update supported components, create a recoverable backup, test on staging when the risk justifies it, prepare a short functional checklist, and know how to roll back.
Once those pieces are in place, the PHP change becomes a controlled maintenance task instead of a guess. If you are unsure which part of the site may be incompatible, document the current setup first and troubleshoot the highest-risk components before changing the live server environment.