public function run() : array
{
$success = [];
$failed = [];
$client = new Client(['timeout' => $this->timeout]);
$pool = new Pool($client, $this->requests(), ['concurrency' => count($this->urls), 'fulfilled' => function (Response $response, string $url) use(&$success, &$failed) {
if (false !== strpos((string) $response->getBody(), $this->needle)) {
$success[] = $url;
} else {
$failed[] = $url;
}
}]);
$pool->promise()->wait();
$failed = array_merge($failed, array_diff($this->urls, $success, $failed));
return [$success, $failed];
}
