在PHP的类级别上允许多重继承吗? [英] Is Multiple Inheritance allowed at class level in PHP?

问题描述

PHP是否在类级别允许多重继承?

Is Multiple Inheritance allowed at class level in PHP?

推荐答案

钻石问题，尚未在PHP中解决(同意如何使用).因此， PHP中没有多重继承.

Multiple inheritance suffers from the Diamond Problem, which has not been (agreed upon how to be) solved in PHP yet. Thus, there is no multiple inheritance in PHP.

    BaseClass
       /\
      /  \
 ClassA  ClassB
      \  /
       \/
     ClassC

如果ClassA和ClassB都定义了自己的方法foo()，您将在ClassC中调用哪个方法?

If both ClassA and ClassB defined their own method foo(), which one would you call in ClassC?

鼓励您使用对象组成或装饰器或策略模式，直到我们特质(或

You are encouraged to either use object composition or interfaces (which do allow multiple inheritance) or - if you are after horizontal reuse - look into the Decorator or Strategy pattern until we have Traits (or Grafts or whatever they will be called then).

一些参考:

• [PHP-DEV]特性，嫁接，水平复用
• [PHP-DEV]多类继承
• RFC:PHP的特征
• 现在在PHP中具有特质的功能

• [PHP-DEV] Traits,Grafts, horizontal reuse
• [PHP-DEV] Multiple class inheritance
• RFC: Traits for PHP
• Traits-like Functionality in PHP now

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