php-guzzleHow to use Guzzle in PHP to make an asynchronous request?

Guzzle is a PHP HTTP client that makes it easy to send HTTP requests and trivial to integrate with web services. It can be used to make asynchronous requests in PHP.

Example code

$client = new GuzzleHttp\Client();
$promise = $client->requestAsync('GET', 'http://www.example.com');
$promise->then(
    function ($response) {
        echo 'I completed! ' . $response->getBody();
    },
    function ($exception) {
        echo 'I failed! ' . $exception->getMessage();
    }
);

Output example

I completed! <html>...</html>

Code explanation

$client = new GuzzleHttp\Client();: Create a new Guzzle client.
$promise = $client->requestAsync('GET', 'http://www.example.com');: Make an asynchronous request to the given URL.
$promise->then(...): Register a callback to be executed when the request is completed.
function ($response) {...}: Callback to be executed when the request is successful.
function ($exception) {...}: Callback to be executed when the request fails.

Helpful links

Guzzle Documentation

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