1. Log into your cPanel account.
2. In the "Software" section, click on the "MultiPHP Manager" Icon.
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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.
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If will take a few seconds, after which your PHP version will reset to the default version.