PHP - 扩展方法，如扩展类
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PHP - extend method like extending a class
提问by Tony
I have 2 class:
我有2个班级：
class animal{
public function walk(){
walk;
}
}
class human extends animal{
public function walk(){
with2legs;
}
}
This way, if i call human->walk(), it only runs with2legs;
这样，如果我调用human->walk()，它只会用2legs 运行；
But I want the run the parent's walk; too.
但我想要跑父母的步行；也。
I know I can modify it this way:
我知道我可以这样修改它：
class human extends animal{
public function walk(){
parent::walk();
with2legs;
}
}
But the problem is, I have many subclasses and I don't want to put parent::walk(); into every child walk(). Is there a way I can extend a method like I extend a class? Without overriding but really extending the method. Or is there better alternatives?
但问题是，我有很多子类，我不想把 parent::walk(); 进入每个孩子walk()。有没有办法像扩展类一样扩展方法？没有覆盖但真正扩展了该方法。或者有更好的选择吗？
Thanks.
谢谢。
回答by Gauthier Boaglio
I would use "hook"and abstractionconcepts :
我会使用"hook"和abstraction概念：
class animal{
// Function that has to be implemented in each child
abstract public function walkMyWay();
public function walk(){
walk_base;
$this->walkMyWay();
}
}
class human extends animal{
// Just implement the specific part for human
public function walkMyWay(){
with2legs;
}
}
class pig extends animal{
// Just implement the specific part for pig
public function walkMyWay(){
with4legs;
}
}
This way I just have to call :
这样我只需要打电话：
// Calls parent::walk() which calls both 'parent::walk_base' and human::walkMyWay()
$a_human->walk();
// Calls parent::walk() which calls both 'parent::walk_base' and pig::walkMyWay()
$a_pig->walk();
to make a child walk his way...
让孩子走他的路……
请参阅模板方法模式。
