<?php

const IPV6_COUNT = 100000;
const IPV6_LENGTH = 39;

function generateIPv6(): string {
    $hex = random_bytes(16);
    return '0'. str_replace('.', '', bin2hex($hex)). ':';
}

function validateIPv6($ip): bool {
    return filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)!== false;
}

function testIPv6($ipv6_test): void {
    foreach ($ipv6_test as $ip => $exp) {
        $out = validateIPv6($ip);
        if ($exp!== $out) {
            echo "$ip failed (expected ". ($exp? 'true' : 'false'). ", got ". ($out? 'true' : 'false'). ")\n";
        }
    }
}

$ipv6_test = array_fill_keys(array_map('generateIPv6', range(1, IPV6_COUNT)), true);
testIPv6($ipv6_test);

?>