Imbo\EventListener\StatsAccess::cidr4Match PHP Method

    private function cidr4Match($ip, $range)
    {
        // Split CIDR on /
        list($subnet, $bits) = explode('/', $range);
        // Convert ip's to long
        $ip = ip2long($ip);
        $subnet = ip2long($subnet);
        // Generate mask and align the subnet if necessary
        $mask = -1 << 32 - $bits;
        $subnet &= $mask;
        // Check for match
        return ($ip & $mask) === $subnet;
    }