We are going to check that PHP is working on your computer by accessing it with Terminal.
We used Terminal to ensure that we had PHP running correctly on our machine. Not only did we check to make sure that PHP was accessible, but we also asked for its version. Your version may differ slightly from mine, but it only matters that your version is PHP 5.3 or higher.
If your version is lower than PHP 5.3 or you were unable to get PHP to respond, ...