All cPanel documentation is located within your cPanel. When you login you are prompted with a popup that directs you Getting Started Wizard or Video Tutorials.
Getting Started Wizard walks you through the initial setup of your account, getting you aquanted with the services and features.
Video Tutorials are hands on visually animated tutorials of the different features found in cPanel.
If you have questions about your PHP hosting, please feel free to submit a ticket in your client area.