php面向对象子类中重载父类方法|重载与重写

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代码示例:

1. <?php
   
2. class person{
   
3.     public $name;
   
4.     public $age;
   
5.     public $sex;
   
6. 
   
7.     public function __construct($name, $age, $sex){
   
8.         $this -> name = $name;
   
9.         $this -> age = $age;
   
10.         $this -> sex = $sex;
    
11.     }
    
12. 
    
13.     public function say(){
    
14.         echo "我的名字是：{$this -> name}，我的年龄是:{$this -> age},我的性别是:{$this -> sex}";
    
15.     }
    
16. }
    
17. 
    
18. class teacher extends person{
    
19.     public $teach;
    
20. 
    
21.     public function __construct($name, $age, $sex, $teach){
    
22.         parent::__construct($name, $age, $sex);
    
23.         $this -> teach = $teach;
    
24.     }
    
25. 
    
26.     //重写：就是声明 一个与父类中同名的方法
    
27.     public function say(){
    
28.         //重载：parent::父类中的方法名
    
29.         parent::say();
    
30.         echo ",我教的学科是:{$this -> teach}";
    
31.     }
    
32. }
    
33. 
    
34. class student extends person{
    
35.     public $school;
    
36. 
    
37.     public function __construct($name, $age, $sex, $school){
    
38.         parent::__construct($name, $age, $sex);
    
39.         $this -> school = $school;
    
40.     }
    
41. 
    
42.     public function say(){
    
43.         parent::say();
    
44.         echo ",我所在的学校是：{$this -> school}";
    
45.     }
    
46. }
    
47. 
    
48. $teacher = new teacher("张三", 30, '男', '数学');
    
49. $teacher -> say();
    
50. 
    
51. echo "<hr />";
    
52. $student = new student("李四", 18, '女', '北大');
    
53. $student -> say();
    

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