The php global variable $_SESSION is an associative array — “key-value” pairs… you index into it with a string … a “value” … we will see this again when we get into databases / sql / php 🙂

We’ll use it to track  how many times the page has been refreshed since it was first loaded and display an image based on that value.

Enter this php code into your file, launch and refresh a few times to see what it’s doing

This page has been refreshed 1 times.