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IP Address

Getting the IP address in PHP is pretty easy:

<?php
$ip = $_SERVER['REMOTE_ADDR'];
?>

Though that can be faked or it could be hidden behind a proxy server. So you could try something like:

<?php
function getIP() 
{
	if(isset($_SERVER['HTTP_CLIENT_IP']))
	{
            $ip = $_SERVER['HTTP_CLIENT_IP'];
	}
	elseif(isset($_SERVER['HTTP_X_FORWARDED_FOR'])) 
	{
            $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
	} 
    else
    {
            $ip = $_SERVER['REMOTE_ADDR'];
	}
	list($ip) = explode(',',$ip);
	return $ip;
}
?>

If you wanted to try and sniff out the real IP address. It won't necessarily work though every time though, you may still get the proxy's IP address.

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