No, Guzzle is not a built-in PHP library. It is a third-party library that needs to be installed separately.
To use Guzzle in your PHP application, you need to first install it using a package manager such as Composer , which is the recommended way of managing dependencies in PHP projects. Once you have installed Guzzle, you can then include it in your PHP code and use its API to send HTTP requests and handle responses.
Here is an example of how to install Guzzle using Composer:
$ composer require guzzlehttp/guzzle
After installing Guzzle, you can use it in your PHP code by including the following statement:
use GuzzleHttp\Client;