<?php
function getIPStringForFullDNS($ip, $class)
{
$limits = array('A' => -3, 'B' => -2, 'C' => -1, 'D' => 0);
$limit = $limits[$class];
$ip = implode('.', explode('.', $ip, $limit));
$ip .= str_repeat('.*', abs($limit));
return $ip;
}
echo getIPStringForFullDNS('158.58.169.254', 'A') . "\n";
echo getIPStringForFullDNS('158.58.169.254', 'B') . "\n";
echo getIPStringForFullDNS('158.58.169.254', 'C') . "\n";
echo getIPStringForFullDNS('158.58.169.254', 'D') . "\n";
preferences:
39.27 ms | 402 KiB | 5 Q