If you wish to reset the PHP version on Domain of Different Servers to the default version, follow these instructions:
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 menu and click the Apply button.
If will take a few seconds, after which your PHP version will reset to the default version.