I want to use filter_var function by this way:

                $ip = "";

                if( !filter_var($ip, FILTER_VALIDATE_IP) )
                        echo "IP is not valid";
                         echo "IP is valid";

I want to check the string $ip is IP address or not.but my PHP version is
 and I know the filter_var requires at least PHP version 5.2.0.
so, Any other function in PHP 5.1.6 can slove this work and replace the
filter_var function ?

Thank you, I'm a new one, so I don't know much about  PHP documentation.

By the way, The PHP version is required. so I can't upgrade it.

Reply via email to