多重继承 python php

python是支持多重继承的

https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/0014318680104044a55f4a9dbf8452caf71e8dc68b75a18000

优先级 https://www.zhihu.com/question/54855335
从左到右，深度遍历。

这个例子可能更好些 https://blog.csdn.net/caiknife/article/details/8579851

class A(object):  
    def __init__(self):  
        super(A, self).__init__()  
        print("A!")  
  
class B(object):  
    def __init__(self):  
        super(B, self).__init__()  
        print("B!")  
  
class AB(A, B):  
    def __init__(self):  
        super(AB, self).__init__()  
        print("AB!")  
  
class C(object):  
    def __init__(self):  
        super(C,  self).__init__()  
        print("C!" ) 
  
class D(object):  
    def __init__(self):  
        super(D, self).__init__()  
        print("D!")  
  
class CD(C, D):  
    def __init__(self):  
        super(CD, self).__init__()  
        print("CD!")  
  
class ABCD(AB, CD):  
    def __init__(self):  
        super(ABCD, self).__init__()  
        print( "ABCD!" )
  
ABCD()  

php虽然不支持多重继承，但是有新加的trait
定义上跟class完全一样，用的时候在子类内use就可以，并且func优先于父类的func

http://php.net/manual/zh/language.oop5.traits.php

<?php
class Base {
    public function sayHello() {
        echo 'Hello ';
    }
}

trait SayWorld {
    public function sayHello() {
        parent::sayHello();
        echo 'World!';
    }
}

class MyHelloWorld extends Base {
    use SayWorld;
}

$o = new MyHelloWorld();
$o->sayHello();
?>