nameservers) { $config->nameservers[] = '8.8.8.8'; } $factory = new Factory(); $resolver = $factory->createCached($config); $name = isset($argv[1]) ? $argv[1] : 'www.google.com'; $resolver->resolve($name)->then(function ($ip) use ($name) { echo 'IP for ' . $name . ': ' . $ip . PHP_EOL; }, 'printf'); Loop::addTimer(1.0, function() use ($name, $resolver) { $resolver->resolve($name)->then(function ($ip) use ($name) { echo 'IP for ' . $name . ': ' . $ip . PHP_EOL; }, 'printf'); }); Loop::addTimer(2.0, function() use ($name, $resolver) { $resolver->resolve($name)->then(function ($ip) use ($name) { echo 'IP for ' . $name . ': ' . $ip . PHP_EOL; }, 'printf'); }); Loop::addTimer(3.0, function() use ($name, $resolver) { $resolver->resolve($name)->then(function ($ip) use ($name) { echo 'IP for ' . $name . ': ' . $ip . PHP_EOL; }, 'printf'); });