PHP is a recursive acronym for "PHP: Hypertext Preprocessor". PHP is a server side scripting language that is embedded in HTML. It's used in a variety of ways such as manage dynamic content, databases, session tracking, and different website builders such as Wordpress are built using PHP which means if the website builder is not set to use the correct version of PHP it could potentially break your website. This is typically an easy fix by updating your website software and the PHP version to the necessary version. The option to change the PHP version for your sites is located in your cPanel under the the bar named SOFTWARE. Within that section, you will click on the icon: MultiPHP Manager.
The page that loads up will will display your domains, and next to it will show the version of PHP that it is running currently.
The way to change the PHP version is to click on the small box to the left of the domain that you want to update then select the php from the drop down on the right hand side of the page. Once you select the PHP version you want to use, click on the Apply button, and it will take at most a few minutes to take effect.
In general, the PHP version for each site is set up to be inherited, so it will be automatically update to the latest version of PHP that is available on our servers.