php：找不到类（动态创建的实例）

Question

我想动态创建一些类的实例，但是我得到一个错误，说找不到类（如果它是从字符串动态调用的），否则如果我通常输入类名来创建类的实例“不使用字符串”将成功创建。

错误：

  

致命错误：第31行的C：\ wamp \ www \ framework \ controllers \ RouterController.php中找不到类'SiteController'

芯/ Controller.php这样

namespace core;

class Controller{

    function __construct(){
        $files = glob('./' . '/*.php');
        foreach ($files as $file) {
            require_once($file);   
        }
    }
}

控制器/ RouterController.php

namespace controllers;

require_once("core/Controller.php");

use \core\Controller;
use \controllers\SiteController;

class RouterController extends Controller{

    private $url;
    private $controller;
    private $controllerName;
    private $action;

    function __construct($url){
        parent::__construct();
        $this->url = $url;
        $this->splitUrl();

        // the following is working successfully

        $this->controller = new SiteController();
        $this->controller->{"$this->action"}();

        if($this->controllerName != '' && $this->action != ''){

            // but this is not working

            $this->controller = new $this->controllerName();
            $this->controller->{"$this->action"}();
        }
    }

    private function splitUrl(){
        $url = preg_split("#/#", $this->url);
        $this->controllerName = !empty($url[0]) ? ucfirst($url[0])."Controller" : null;
        $this->action = !empty($url[1]) ? $url[1] : "index";
    }
}

控制器/ SiteController.php

namespace controllers;

class SiteController{

    public function index(){
        echo "this is index";
    }
}