<?php
    if(!isset($_GET['testcookie'])) {
        setcookie("testcookie", "test value");
        header("Location:  {$_SERVER["PHP_SELF"]}?testcookie=1");
        exit;
    } else {
        if(isset($_COOKIE['testcookie'])) {
            setcookie("testcookie");
            echo "You have cookies enabled";
        } else {
            echo "You do not support cookies!";
        }
    }
?>