This article tells you how to pass variables to a PHP page using the query string, and how to access them from that page. Have you ever seen a URL which looked like "www.example.com/pag e.php?mode=1&style=red"? Well, this page is being passed variables and their values through the query string, here the variables "mode" and "style" are being passed, with values "1" and "red" respectively. The question mark indicates the start of the query string and the ampersand, &, symbol seperates variable=value assignments.