"Cookies have long been used in PHP scripts, and are a very useful function. But what exactly are cookies? Maybe you have used them, but you still don't know exactly what they are. Or you are completely new to cookies? It doesn't matter, because in this tutorial on phpit.net, Dennis Pallett shows you what cookies are, and what they are used for. The tutorial explains cookies in a nutshell, using PHP's built-in setcookie() function, checking if cookies are enabled, and using cookies to store multi-dimensional arrays.""

PHP cookies will not cause you to gain weight! But if you ever wondered what they are and how they function, read PHP and cookies - a good mix at PHP Magazine.