// Setup from env
$requestIP = $_SERVER[ "REMOTE_ADDR" ];

if ( $_SERVER[ "HTTP_CLIENT_IP" ] )
{
	$requestIP = $_SERVER[ "HTTP_CLIENT_IP" ];
}
else if ($_SERVER[ 'HTTP_X_FORWARDED_FOR' ] AND preg_match_all( "#d{1,3}.d{1,3}.d{1,3}.d{1,3}#s", $_SERVER[ 'HTTP_X_FORWARDED_FOR' ], $matches ) )
{
	foreach ( $matches[0] as $IP )
	{
		// Chuck out RFC1918 IP
		if ( !preg_match( "#^(10|172.16|192.168).#", $IP ) )
		{
			$requestIP = $IP; break;
		}
	}
}
else if ( $_SERVER[  "HTTP_FROM" ] )
{
	$requestIP = $_SERVER[ "HTTP_FROM" ];
}
else if ( $_SERVER[ "HTTP_PROXY_USER" ] )
{
	$requestIP = $_SERVER[ "HTTP_PROXY_USER" ];
}

Nobody can do everything. As your business grows you will need to outsource some of the work. You could hire employees but those ongoing costs can eat up a lot of capital. What if you need a certain task this employee does not know how to do? Do it you…

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Great read though, very well explained

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