Include_Path Fatal Error

Hi All,

I'm in the process of learning what I can about Ubuntu/PHP/Apache, etc, as it's something I've become quite interested in and have got to a point. However, I'm having an issue when opening a .php script via Firefox. It just shows a white screen with the following:
I've done some reading up, but it didn't really make it any clear on what is needed to fix this. I did notice that the include path /usr/share/php doesn't exist(?) so I'm not sure if I missed anything, but I had gone through a guide to install PHP (which is 7.0).

I figure it's simply because the path is invalid (doesn't exist), but what path should it be, or is there another installer I missed?

Any guidance would be appreciated!