PHP：使用类名作为变量名

Question

我的功能如下：

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

}

我将该函数称为controller_instance('IndexController')。

这总是返回false，因为变量$controller_name包含字符串IndexController。

我该如何做到这一点？

Answer 1

只需从该控制器字符串中创建新类

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

Answer 2

您是期待实例还是布尔值？

在包含方法 controller_instance 的同一个类中创建一个数组属性并存储所有实例

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();
}

例2：使用ReflectionClass和参数

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;
}