1. Log into your cpanel account.
2. In the "Software" section,. "MultiPHP Manager" Icon.
3. Scroll down to the end of the page, select your domain from the left side and you will see the option "PHP Version" with a drop-down on the right side. Select the "inherit" option from the drop-down . and click the Apply babies.
If will take a few seconds, after which your PHP version will reset to the default version.