How to set a custom User-Agent header for a Guzzle request in PHP?

To set a custom User-Agent header for a Guzzle request in PHP, you can use the headers option when making the request. Here's an example:

use GuzzleHttp\Client;

$client = new Client();

$response = $client->request('GET', 'https://api.example.com', [
    'headers' => [
        'User-Agent' => 'MyCustomUserAgent/1.0',
    ],
]);

$body = $response->getBody()->getContents();

In this example, a custom User-Agent header (MyCustomUserAgent/1.0) is set for the Guzzle request by passing an array of headers in the headers option. The header key is User-Agent and the value is the desired user agent string.

You can modify the User-Agent value according to your requirements.