在Codeigniter 4中添加Facebook库

$psr4 = [
    // ...
    'Facebook\\' => APPPATH . 'ThirdParty/facebook-php-sdk/src/Facebook',
];

use Facebook\Facebook;

class MyController extends BaseController
{
    public function index()
    {
        // 创建一个Facebook实例
        $fb = new Facebook([
            'app_id' => 'YOUR_APP_ID',
            'app_secret' => 'YOUR_APP_SECRET',
            'default_graph_version' => 'v2.10',
        ]);

        // 调用Facebook API
        try {
            $response = $fb->get('/me');
            $userNode = $response->getGraphUser();
            echo 'Hello, ' . $userNode->getName();
        } catch (Facebook\Exceptions\FacebookResponseException $e) {
            echo 'Graph returned an error: ' . $e->getMessage();
        } catch (Facebook\Exceptions\FacebookSDKException $e) {
            echo 'Facebook SDK returned an error: ' . $e->getMessage();
        }
    }
}