Get User IP Address in PHP

	public static function 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 = '0.0.0.0';
	    return $ipaddress;
	}