Есть 100к URL. Нужно спарсить их содержимое. Как сделать обход этого количества в 5 поток одновременно (php+curl)?

use GuzzleHttp\Pool;
use GuzzleHttp\Client;
use GuzzleHttp\Psr7\Request;

$client = new Client();

$requests = function ($total) {
    $uri = 'http://127.0.0.1:8126/guzzle-server/perf';
    for ($i = 0; $i < $total; $i++) {
        yield new Request('GET', $uri);
    }
};

$pool = new Pool($client, $requests(100), [
    'concurrency' => 5,
    'fulfilled' => function ($response, $index) {
        // this is delivered each successful response
    },
    'rejected' => function ($reason, $index) {
        // this is delivered each failed request
    },
]);

// Initiate the transfers and create a promise
$promise = $pool->promise();

// Force the pool of requests to complete.
$promise->wait();