<?php

namespace App\Services\CustomDomain;

class DnsResolver
{
    /** @return array<int,string> the A-record IPs for a host */
    public function aRecords(string $host): array
    {
        $records = @dns_get_record($host, DNS_A);
        if (! is_array($records)) {
            return [];
        }

        return array_values(array_filter(array_map(fn ($r) => $r['ip'] ?? null, $records)));
    }
}