PHP7.x is the latest version of PHP and it adds a massive amount of speed and security improvements. If possible you should be using PHP7.2 (the latest version by default in WebCP) but in some cases your apps might not work with PHP7.2. If that’s the case you certainly should consider upgrading your app but in the meanwhile you may want to revert to PHP5.6.
In WebCP 2.1.0 we’ve added a PHP version selector so you can select between PHP7.2 and PHP5.6 for your apps.
PHP Version Selector in WebCP
To get to the PHP selector, click on the “Domains->Domains” menu in the left navigation. In the domain listing click on the “Domain Settings” button for the domain you want to change.
In the domain settings page select PHP5.6 or PHP7.2 from the PHP Version dropdown and save the settings.