Something

// if env var is set and no session var, then not acceptedif (getenv('PHP_ckset') == true && !isset($_SESSION['foo'])){	echo 'cookies not accepted';}// if env var isn't set, and no session var, then set env var, and session valueelseif (!getenv('PHP_ckset') && !isset($_SESSION['foo'])){	$_SESSION['foo'] = true;	putenv('PHP_ckset=true');	header("Location: " . $_SERVER['PHP_SELF']);	exit;}// else all is quiet on the eastern frontelse{	echo "cookies accepted";}