PHP：使用類名作為變量名

Question

我有一個功能為：

public function controller_instance($controller_name)
{
      $controller = Router::getRequestedController();
      return $controller instanceof $controller_name;

}

我將函數稱為controller_instance('IndexController') 。

這總是返回false，因為變量$controller_name包含字符串IndexController 。

我該如何進行這項工作？

Answer 1

只需從該控制器字符串創建新類

return $controller instanceof (new $controller_name());

Answer 2

您是否需要實例或布爾值？

在包含方法controller_instance的同一類中創建一個數組屬性，並存儲所有實例

private $controllers = array();

public function controller_instance($controller_name)
{
    if (isset($this->controllers[$controller_name])) {
        return $this->controllers[$controller_name];
    }
    return $this->controllers[$controller_name] = new $controller_name();
}

---

示例2：使用ReflectionClass和參數

private $controllers = array();

public function controller_instance($controller_name, Array $args = array())
{
    if (isset($this->controllers[$controller_name])) {
        return $this->controllers[$controller_name];
    }

    $class = new ReflectionClass($controller_name);

    $instance = $class->newInstanceArgs($args);

    return $this->controllers[$controller_name] = $instance;
}