If you want to reset the PHP version to its default state, perform these steps:
1. Log in to your cPanel account.
2. In the Software section, click on MultiPHP Manager.
3. Scroll down to the bottom of the page. Select your domain from the left side of the screen. You can view the PHP Version from the drop-down menu on the right. Please, select the appropriate PHP version from it and click on Apply.
After a few seconds, your PHP version will be reset to the default version.