<?php
    $cookie_var = "username";
    $cookie_val = "admin";
    setcookie($cookie_var, $cookie_val, time() + 3600); //3600 = 1 hour)
?>

<html>
<body>
<?php
    if(count($_COOKIE) > 0) 
    {
        echo "Cookie is enabled";
    }
    else {
        echo "Cookie is disabled";
    }
?>
</body>
</html>