<?php 
 
use React\Dns\Config\Config; 
use React\Dns\Resolver\Factory; 
 
require __DIR__ . '/../vendor/autoload.php'; 
 
$loop = React\EventLoop\Factory::create(); 
 
$config = Config::loadSystemConfigBlocking(); 
$server = $config->nameservers ? reset($config->nameservers) : '8.8.8.8'; 
 
$factory = new Factory(); 
$resolver = $factory->create($server, $loop); 
 
$name = isset($argv[1]) ? $argv[1] : 'www.google.com'; 
 
$resolver->resolve($name)->then(function ($ip) use ($name) { 
    echo 'IP for ' . $name . ': ' . $ip . PHP_EOL; 
}, 'printf'); 
 
$loop->run(); 
 
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