How to Change the PHP Version via CloudLinux Selector in Plesk?
You can use CloudLinux's Select PHP Version to change your website's PHP Version. CloudLinux provides various PHP Versions to choose from.
1. Log in to your Plesk account.
2. In the right-hand sidebar, click on PHP Selector.
3. In the front of the Current PHP version, click on the drop-down menu and choose the version you wish to use.
4. Click Set as current.