使用作曲家，通过uri REQUEST_URI调用类不要工作吗？

Question

http://impare.local/postgres/Update

url 2是更新，但不要调用该类！

namespace postgres;    
require "vendor/autoload.php";

use postgres\Connection as Connection;<br>
use postgres\CreateTables as CreateTables;<br>
use postgres\UpdateTables as UpdateTables;<br>
use postgres\Stocs as Stocs;<br>
use postgres\persons\Persons as Persons;<br>
use postgres\core\Route as Route;<br>
use postgres\persons\Update as Update;<br>

$url = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : null;
$url = explode('/', rtrim($url, '/'));    

$class = $url[2];
$controller = new $class(); //Update Class