Simple class for easy IP operations in php

IPUtilities.php

<?php
class IPUtilities {
    static function IsInIPv4Range($ipaddress, $range){
        // convert the ip to long respresentation
        $long = ip2long($ipaddress);
        // split the range/cidr
        $parts = explode('/', $range);
        // convert the range to long representation
        $rangeAddr = ip2long($parts[0]);
        // binary mask
        $cidrMask = -1 << (32 - (int)$parts[1]);
        return ($long & $cidrMask) == ($rangeAddr & $cidrMask);
    }

    static function IsIpv6InSubnet($ip, $subnet, $prefix) {
        // Convert IPv6 addresses to binary strings
        $ipBinary = inet_pton($ip);
        $subnetBinary = inet_pton($subnet);

        if ($ipBinary === false || $subnetBinary === false || $prefix < 0 || $prefix > 128) {
            return false; // Invalid input
        }

        // Generate an IPv6 mask as a binary string
        $mask = self::GenerateIpv6Mask($prefix);

        // Apply the mask and compare
        return ($ipBinary & $mask) === ($subnetBinary & $mask);
    }

    private static function GenerateIpv6Mask($prefix) {
        $mask = str_repeat("\xFF", (int)($prefix / 8)); // Full bytes
        if ($prefix % 8 !== 0) {
            $mask .= chr(0xFF << (8 - ($prefix % 8))); // Partial byte
        }
        $mask = str_pad($mask, 16, "\x00"); // Pad to full 16-byte length
        return $mask;
    }
}
// example
var_dump(IPUtilities::IsInIPv4Range("127.0.0.1", "127.0.0.0/8")); // true
var_dump(IPUtilities::IsIpv6InSubnet("fe80::1", "fe80::", 10)); // true
?>