<?php
$ipv6_test = array();

for ($i = 0; $i < 100000; $i++) {
    $ip = '0:'. str_repeat('0', 15 - strlen(bin2hex(random_bytes(6)))). ':'. bin2hex(random_bytes(2)). ':'. bin2hex(random_bytes(2)). ':'. bin2hex(random_bytes(2)). ':'. bin2hex(random_bytes(2)). ':'. bin2hex(random_bytes(4));
    $ipv6_test[$ip] = true;
}

foreach ($ipv6_test as $ip => $exp) {
    $out = filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6);
    $out = $out!== false;
    if ($exp!= $out) {
        echo "$ip failed (expected ", $exp?"true":"false", ", got ",
            $out?"true":"false", ")\n";
    }
}

?>