Get Client IP Address

The following PHP code snippet will return client IP address.

function get_client_ip() {
	$ipaddress = '';
	if (getenv('HTTP_CLIENT_IP'))
		$ipaddress = getenv('HTTP_CLIENT_IP');
	else if(getenv('HTTP_X_FORWARDED_FOR'))
		$ipaddress = getenv('HTTP_X_FORWARDED_FOR');
	else if(getenv('HTTP_X_FORWARDED'))
		$ipaddress = getenv('HTTP_X_FORWARDED');
	else if(getenv('HTTP_FORWARDED_FOR'))
		$ipaddress = getenv('HTTP_FORWARDED_FOR');
	else if(getenv('HTTP_FORWARDED'))
	   $ipaddress = getenv('HTTP_FORWARDED');
	else if(getenv('REMOTE_ADDR'))
		$ipaddress = getenv('REMOTE_ADDR');
	else
		$ipaddress = 'UNKNOWN';

	return $ipaddress;
}

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