The difference between PHP's three access control modes: public, protected, and private, protectedprivate_PHP tutorial

The difference between the three access control modes of public, protected and private in php, protectedprivate

The difference between the three access control modes of public, protected and private in php

public: public type

In a subclass, you can call public methods or properties through self::var, and parent::method to call parent class methods

In an instance, you can call public type methods or properties through $obj->var

protected: protected type
In a subclass, you can call protected methods or attributes through self::var, and parent::method to call parent class methods

You cannot call protected type methods or properties through $obj->var in an instance

private: Private type
The attributes or methods of this type can only be used in this class. The attributes and methods of private types cannot be called in instances of this class, subclasses, or instances of subclasses

2. The difference between self and parent
a). These two objects are commonly used in subclasses. The main difference between them is that self can call public or protected properties in the parent class, but parent cannot call

b).self:: It represents the static members (methods and properties) of the current class. Unlike $this, $this refers to the current object

Attached code:

/**
* parent can only call public or protected methods in the parent class, but cannot call attributes in the parent class
* self can call methods and attributes in the parent class except private types All data of
*/
class User{
    public $name;
    private $passwd;
    protected $email;    
    public  function __construct(){
        //print __CLASS__." ";
        $this->name= 'simple';
        $this->passwd='123456';
        $this->email = 'bjbs_270@163.com';
    }    
    public function show(){
        print "good ";
    }    
    public function inUserClassPublic() {
        print __CLASS__.'::'.__FUNCTION__." ";
    }    
    protected  function inUserClassProtected(){
        print __CLASS__.'::'.__FUNCTION__." ";
    }    
    private function inUserClassPrivate(){
        print __CLASS__.'::'.__FUNCTION__." ";
    }
}

class simpleUser extends User {    
    public function __construct(){        
        //print __CLASS__." ";
        parent::__construct();
    }
    
    public function show(){
        print $this->name."//public ";        
        print $this->passwd."//private ";
        print $this->email."//protected ";
    }
    
    public function inSimpleUserClassPublic() {
        print __CLASS__.'::'.__FUNCTION__." ";
    }
    
    protected function inSimpleUserClassProtected(){
        print __CLASS__.'::'.__FUNCTION__." ";
    }
    
    private function inSimpleUserClassPrivate() {
        print __CLASS__.'::'.__FUNCTION__." ";
    }
}

class adminUser extends simpleUser {
    protected $admin_user;
    public function __construct(){
        //print __CLASS__." ";
        parent::__construct();
    }
    
    public function inAdminUserClassPublic(){
        print __CLASS__.'::'.__FUNCTION__." ";
    }
 
protected function inAdminUserClassProtected(){
print __CLASS__.'::'.__FUNCTION__." ";
 }
 
private function inAdminUserClassPrivate(){
print __CLASS__.'::'.__FUNCTION__." ";
}
}

class administrator extends adminUser {
public function __construct(){ parent::__construct();
}
}

/**
* In an instance of a class, only public properties and methods can be called through instantiation
*/
$s = new administrator();
print '--------- ---------';
$s->show();
?>

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