In GARMTECH hosting, you can switch the PHP version for each website in Plesk. This is useful when a site requires a newer (or older) PHP version, or when you troubleshoot compatibility issues.
Where to change the PHP version
You can change the PHP version per domain in Plesk:
- Websites & Domains → select your domain → PHP or PHP Settings
- In some Plesk layouts: Websites & Domains → select your domain → Hosting Settings
Change the PHP version (step-by-step)
- Log in to Plesk.
- Go to Websites & Domains.
- Find your domain and open PHP (or PHP Settings).
- Make sure PHP support is enabled (if the checkbox exists).
- Select the required PHP version from the drop-down list.
- Click Apply (or OK) to save changes.
- Open your website in a new browser tab and test the key pages (home page, login page, checkout, contact form).
Quick rollback if the website shows an error
If the site returns a 500/503 error after switching PHP, you can roll back immediately:
- Return to the same PHP Settings page in Plesk.
- Select the previous PHP version.
- Apply changes and test again.
Common issues after switching PHP
- 500 Internal Server Error: most often caused by incompatible plugins/themes (WordPress) or deprecated functions in custom code. Roll back the version and update the site components.
- White screen / blank page: enable error display for debugging, or check logs (see below).
- Memory exhausted / timeouts: adjust PHP limits in Plesk (memory_limit, max_execution_time) if your plan allows, or optimize the application.
Where to check errors
- In Plesk, open Websites & Domains → your domain → Logs to view recent web server and PHP errors.
- If your application (for example, WordPress) has its own debug log, review it as well.
If the PHP version you need is not available
The list of available PHP versions depends on the server configuration. If you do not see the required version in Plesk, create a support request and specify the domain name and the PHP version you need.
