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All the snippets make 10 requests to a fake API that takes 3 seconds to reply.

On my computer, multiple executions of these scripts ran in a little more than 3 seconds.

You can configure how many simultaneous connections to make in each client.

Using Symfony’s HTTPClient

Installation

$ composer require symfony/http-client

Example

$client = new \Symfony\Component\HttpClient\CurlHttpClient([], 10);
$responses = [];

for ($i = 0; $i < 10; ++$i) {
    $responses[] = $client->request('GET', 'http://slowwly.robertomurray.co.uk/delay/3000/url/https://jsonplaceholder.typicode.com/todos/1');
}

foreach ($responses as $response) {
    $content = $response->getContent();
}

Using Guzzle

Installation

$ composer require guzzlehttp/guzzle:^7.0

Example

$client = new \GuzzleHttp\Client();
$responses = [];

$generator = function ($total) use ($client) {
    for ($i = 0; $i < $total; $i++) {
        yield function() use ($client) {
            return $client->getAsync('http://slowwly.robertomurray.co.uk/delay/3000/url/https://jsonplaceholder.typicode.com/todos/1');
        };
    }
};

$pool = new \GuzzleHttp\Pool($client, $generator(10), [
    'concurrency' => 10,
    'fulfilled' => function (\GuzzleHttp\Psr7\Response $response, $index) use (&$responses) {
        $responses[$index] = $response->getBody()->getContents();
    },
]);

$promise = $pool->promise();

$promise->wait();

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