Please advise on PHP class library loading rules

Question

I have a question. . My project loads classes purely through a custom namespace. Then I will introduce a third-party class library. This class library is loaded according to the PSR-4 specification. In this case. How can I reference this third-party class library in the project without changing my original loading rules?

Answer 1

Composer introduces a third-party class library, and introduces composer's autoload.php in the entry file to automatically load the file

Answer 2

The project has an entry file, just require it in the entry file

Answer 3

First require the third-party class library, and then use it. Then you can instantiate this class, for example:

<?php
namespace common\services\money;

require_once ROOT_PATH . '/extensions/payssion/lib/PayssionClient.php';

use PayssionClient;

class PayssionService
{
    public function test()
    {
        $payssion = new PayssionClient();
    }
}