PHP Object-Oriented encapsulation

<?php
The concept of a class
The concept of objects
Defining classes
Class Ren
{
Member variables
Member Methods
}
Created objects
$r =new Ren ();
Call the member of the object $r->

Object-oriented three main features: encapsulation, inheritance, polymorphism
1. Encapsulation
Purpose: Make classes more secure: Do not let outsiders directly access the members of the class

Specific practices:
1. member becomes private: access modifier: (Public private privately owned protected protected, only that class and subclass are accessible)
2. Create a member method to manipulate variables

Class Ren
{

private $age;//Privacy Member
Private $name;
Private $sex;
Constructor initializes the member variables when the object is created.
/* Special point: 1. Special execution time: Automatic execution when object new is created
2. Special __construct * *
function __construct ($s)
{
$this->sex= $s;
}

/* (Method one)
Methods to assign values to variables
Public function setage ($a)
{
if ($a >18and$a<50)
{
$this->age= $a;
}
}
Take value
function Getage ()
{
return $this->age;
}*/

(Method Two)
3. The __get () and __set () methods provided in the applicable class, the method of assigning values to variables
function __set ($n, $v)
{
if ($n = = "Age")
{
if ($v >18and $v <50)
{
$this $n = $v;
}
}
Else
{
$this $n = $v;
}
}
Method of taking value
function __get ($n)
{
return $this $n;
}
}

$r =new Ren ("male");
$r->age=20;
$r->name= "Zhang San";
Echo $r->name;
Var_dump ($R);

?>

PHP Object-Oriented encapsulation