了解PHP中的继承

问题描述

我刚接触PHP(通常)中的OOP，并且对继承有疑问.

I'm new to using OOP in PHP (And in general) and I had a question about inheritance.

我有以下课程:

class OCITable {
  public function display() {
    $this->drawHeader();
    $this->drawFooter();
    $this->drawBody();
  }

  private function drawHeader() {
    ...
  }

  private function drawFooter() {
    ...
  }

  private function drawBody() {
    ...
  }
}

class OCITableServer extends OCITable {
  private function drawBody() {
    ...
  }
}

我想做的是否决私有函数drawBody().这似乎不起作用.我认为这是因为OCITableServer对象调用display()时，它将调用父类的display()，而父类又调用了其drawBody()，而不是新的drawBody().

What I'm trying to do is overrule the private function drawBody(). This doesn't seem to work. I think this is because when a OCITableServer object calls display(), it calls the parent class's display(), which in turn calls its drawBody(), instead of the new drawBody().

在不重新定义子类中的display()的情况下，我将如何完成我想做的事情?

How would I accomplish what I'm trying to do without redefining display() in my sub class?

推荐答案

Protected方法可以在子类中覆盖.私有功能不能.

Protected methods can be overridden in subclasses. Private functions cannot.

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