[转]php的public、protected、private三种访问控制模式的区别

 1 <?php
 2 /**
 3  * parent　只能调用父类中的公有或受保护的方法，不能调用父类中的属性
 4  * self 　可以调用父类中除私有类型的方法和属性外的所有数据
 5  */
 6 class User{
 7     public $name;
 8     private $passwd;
 9     protected $email;    
10     public  function __construct(){
11         //print __CLASS__." ";
12         $this->name= ‘simple‘;
13         $this->passwd=‘123456‘;
14         $this->email = ‘bjbs_270@163.com‘;
15     }    
16     public function show(){
17         print "good ";
18     }    
19     public function inUserClassPublic() {
20         print __CLASS__.‘::‘.__FUNCTION__." ";
21     }    
22     protected  function inUserClassProtected(){
23         print __CLASS__.‘::‘.__FUNCTION__." ";
24     }    
25     private function inUserClassPrivate(){
26         print __CLASS__.‘::‘.__FUNCTION__." ";
27     }
28 }
29 
30 class simpleUser extends User {    
31     public function __construct(){        
32         //print __CLASS__." ";
33         parent::__construct();
34     }
35     
36     public function show(){
37         print $this->name."//public ";        
38         print $this->passwd."//private ";
39         print $this->email."//protected ";
40     }
41     
42     public function inSimpleUserClassPublic() {
43         print __CLASS__.‘::‘.__FUNCTION__." ";
44     }
45     
46     protected function inSimpleUserClassProtected(){
47         print __CLASS__.‘::‘.__FUNCTION__." ";
48     }
49     
50     private function inSimpleUserClassPrivate() {
51         print __CLASS__.‘::‘.__FUNCTION__." ";
52     }
53 }
54 
55 class adminUser extends simpleUser {
56     protected $admin_user;
57     public function __construct(){
58         //print __CLASS__." ";
59         parent::__construct();
60     }
61     
62     public function inAdminUserClassPublic(){
63         print __CLASS__.‘::‘.__FUNCTION__." ";
64     }
65     
66     protected function inAdminUserClassProtected(){
67         print __CLASS__.‘::‘.__FUNCTION__." ";
68     }
69     
70     private function inAdminUserClassPrivate(){
71         print __CLASS__.‘::‘.__FUNCTION__." ";
72     }
73 }
74 
75 class administrator extends adminUser {
76     public function __construct(){        
77         parent::__construct();
78     }
79 }
80 
81 /**
82  * 在类的实例中 只有公有属性和方法才可以通过实例化来调用
83  */
84 $s = new administrator();
85 print ‘-------------------‘;
86 $s->show();
87 ?>