dns-over-https/examples/benchmark.php

<?php

require __DIR__ . "/_bootstrap.php";

use Amp\DoH;
use Amp\Dns;
use Amp\Loop;

print "Downloading top 500 domains..." . PHP_EOL;

$domains = \file_get_contents("https://moz.com/top-500/download?table=top500Domains");
$domains = \array_map(function ($line) {
    return \trim(\explode(",", $line)[1], '"/');
}, \array_filter(\explode("\n", $domains)));

// Remove "URL" header
\array_shift($domains);

// Set default resolver to DNS-over-HTTPS resolver
$DohConfig = new DoH\DoHConfig([new DoH\Nameserver('https://mozilla.cloudflare-dns.com/dns-query')]);
Dns\resolver(new DoH\Rfc8484StubResolver($DohConfig));

Loop::run(function () use ($domains) {
    print "Starting sequential queries...\r\n\r\n";

    $timings = [];

    for ($i = 0; $i < 10; $i++) {
        $start = \microtime(1);
        $domain = $domains[\random_int(0, \count($domains) - 1)];

        try {
            pretty_print_records($domain, yield Dns\resolve($domain));
        } catch (Dns\DnsException $e) {
            pretty_print_error($domain, $e);
        }

        $time = \round(\microtime(1) - $start, 2);
        $timings[] = $time;

        \printf("%'-74s\r\n\r\n", " in " . $time . " ms");
    }

    $averageTime = \array_sum($timings) / \count($timings);

    print "{$averageTime} ms for an average query." . PHP_EOL;
});