Count the various aspects of life inherited by PHP

Definition: PHP inheritance is somewhat different from other pure object-oriented (completely dominated by object-oriented thinking from the beginning of design) programming languages.

1.Inheritance in PHP can only single inheritance:That is, the subclass has only one parent class (JavaOnly supports single inheritance, C supports multiple inheritance)

<?php
class Man{}
class Woman{}
class Ladyboy extends Man,Woman{}	//PHP中错误，不允许继承多个父类
?>

2. If PHP wants to inherit multiple classes, you can use chain inheritance

<?php
class Man{}
class Woman extends Man{}
class Ladyboy extends Woman{}	//Ladyboy包含了Man和Woman类中所有可继承的成员
?>

3. In PHP, only private methods cannot be inherited (private properties can be inherited, but cannot be accessed)

4.PHP allows subclasses to inherit the constructor and destructor methods of the parent class

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