Once your web application has set a cookie in a user’s browser, it is a simple matter to retrieve that value in subsequent page requests. This tech-recipe describes reading a value from a cookie in PHP.
After a cookie with a name of “user” has been set in a previous page, the value can be accessed with the global array $_COOKIE like this:
$user = $_COOKIE['user'];
Since this is a normal array, anything you can do to an array iterate through it one value at a time as described in this tutorial. For debugging purposes, it is often useful to use this quick trick to see the whole contents of an array:
print_r($_COOKIE);
