php - 扩展抽象类时出现意外结果

Question

我试图故意打印错误“存在错误”，但收到“成功”消息？

知道为什么吗？

谢谢

abstract class Restful
{
  public $error = array();

  public function __construct()
  {
     //Doing something here
     //....
     //....
     $this->validate_params();
  }

  public function validate_params()
  {
     $this->error[] = 'test error';
  }
}

class RestfulRequest extends Restful
{
  public function __construct()
  {
     if (count($this->error) > 0)
     {
        exit('There is an error');
     }

     echo 'Success';
  }
}

new RestfulRequest();

Answer 1

您忘记调用父构造函数:

class RestfulRequest extends Restful
{
  public function __construct()
  {
     parent::__construct(); // <-- added
     if (count($this->error) > 0)
     {
        exit('There is an error');
     }