PHP IP Grabbing Script

<?php

//Redirects the user so they never know they visited your site
header( 'Location: http://www.google.co.uk' );

//Get the ip address of the user
$ip=$_SERVER['REMOTE_ADDR'];

//Write the IP to a file
$myFile = "ip.txt";
$fh = fopen($myFile, 'a') or die("can't open file");
$stringData = "$ip\n";
fwrite($fh, $strintgDate);
fclose($fh);
?>