PHP Notes: Detailed explanation based on object-oriented design_PHP tutorial

public means global and can be accessed by subclasses inside and outside the class;

Copy code The code is as follows:

< ?php

class Test{
public $name='Janking',
$sex='male',
$age=23;

function __construct() {
                           echo $this->age.'
'.$this->name.'
'.$this->sex.'


';
$P->age=100;
$P->name="Rainy";
$P->sex= "female";
$P->func();
?>
Public


private means private and can only be used within this class;



Copy code

The code is as follows:

class Test{ private $name=' Janking', $sex='male', $age=23;

function __construct(){

$this->funcOne();
}

function func(){
echo $this->age.'
'.$this->name.'
'.$this-> sex.'
';
}

>name.'
'.$this->sex.'
';
                 }                  Test();
echo '

';
$P->func();
$P->age=100; // Cannot access private property Test::$age
$P->name="Rainy"; // Cannot access private property Test::$name
$P->sex="female"; // Cannot access private property Test::$female
$P->funcOne(); // Call to private method Test::funcOne() from context ''
?>
Private


protected means protected and can only be accessed in this class or subclass or parent class; Magic methods related to encapsulation:


__set(): It is a method that is automatically called when directly setting the property value of a private member

__get(): It is a method that is automatically called when it is directly getting the value of a private member property

__isset(); is a method that is automatically called when isset directly to check whether the private attributes in the object exist

__unset(); is a method that is automatically called when directly unset deletes the private attributes in the object



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public means global and can be accessed by both internal and external subclasses of the class; copy the code as follows: ?php class Test{ public $name='Janking', $sex='male', $age=23; function __construct(){ echo...

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