Disable proxy

<?php //insert into <head></head>
if(@fsockopen($_SERVER['REMOTE_ADDR'], 80, $errstr, $errno, 1))
die("It would apprear you're using a proxy, so please, go fuck yourself!");

function checkProxy($ip){
        $contactEmail="EMAIL";
        $timeout=3;
        $banOnProability=0.99;

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
        curl_setopt($ch, CURLOPT_URL, "http://check.getipintel.net/check.php?ip=$ip");
        $response=curl_exec($ch);

        curl_close($ch);


        if ($response > $banOnProability) {
                return true;
        } else {
            if ($response < 0 || strcmp($response, "") == 0 ) {
                //The server returned an error, you might want to do something
                //like write to a log file or email yourself
                //This could be true due to an invalid input or you've exceeded
                //the number of allowed queries. Figure out why this is happening
                //because you aren't protected by the system anymore
                //Leaving this section blank is dangerous because you assume
                //that you're still protected, which is incorrect
                //and you might think GetIPIntel isn't accurate anymore
                //which is also incorrect.
                //failure to implement error handling is bad for the both of us
            }
                return false;
        }
}
$ip=$_SERVER['REMOTE_ADDR'];
if (checkProxy($ip)) {
    echo "It would apprear you're using a proxy, so please, go fuck yourself! <br />";
}
?>