In addition to the default PHP installation, A2 Hosting provides full, complete builds for several alternate PHP versions. These versions are built with all of the common (and several uncommon) plugins and options. For detailed information about using alternate PHP versions, please see this article.
To change the PHP version in cPanel, follow these steps:
In the Software/Services section of the cPanel home screen, click PHP Version. The Select PHP Version page appears.
To switch back to the original PHP version, select the version marked as the system default.
Select the PHP version that you want, and then click Submit. The new PHP version setting takes effect immediately.