问来自PSR-4项目的PHP使用相同的命名空间打印所有类的所有方法

EN

class myUtils{

    public function getAllMethods(){

        $loader = new ClassLoader();
        $loader->loadClass('App\DIR1');
        $loader->register();

        // Faa and Foo are the name of the classes of the file Fii.php and Faa.php located in DIR1 directory, the namespace of theses classes is App\DIR1
        if (class_exists("Foo") && class_exists("Faa")){
            dump('Its OK !');
        }else{
            dump('its NOT OK');
        }

        // the dump "Its NOT OK" is printed, I don't find how I can load dynamically Faa and Foo classes..
    }
}