To choose your PHP version:
In cPanel go to "Software/Services"
Click "Select PHP Version"
Click the dropdown for "PHP Version" and choose the version of PHP you like
Click the "Set as current" button
Note: Make sure you have the proper modules enabled for the PHP version you choose, as some apps/scripts require certain modules.
For example, WordPress requires the mysql module and you will receive an error if not enabled when browsing your WordPress installation.
For example, WordPress requires the mysql module and you will receive an error if not enabled when browsing your WordPress installation.