Applications, plugins, and themes can require a minimum PHP version or fail on a version they do not yet support.
- Record the currently selected PHP version in MultiPHP Manager.
- Check the application and extension requirements before switching versions.
- Review logs for syntax errors, missing functions/classes, or extension requirements that appeared after a PHP change.
- Test a supported version on a staging copy when practical.
- After changing PHP, retest both public pages and background/admin functions.
Do not assume that the newest PHP version is automatically compatible with every installed application component. Likewise, remaining on an obsolete PHP version can create security and compatibility problems.
