php object-oriented encapsulation

This article mainly introduces the object-oriented encapsulation of PHP, which has certain reference value. Now I share it with everyone. Friends in need can refer to it.

Definition:

Hidden objects The attributes and implementation details only provide public calls to the outside world to control the access level of reading and modifying attributes in the program.

Access control (visibility constraints)

Achieved by adding keywords in front.

Example

<?php

class MyClass
{
    public $a =&#39;public&#39;;
    protected $b =&#39;protected&#39;;
    private $c = &#39;private&#39;;

    public function test(){
        // 类自身调用
        //echo $this->a;
        //echo $this->b;
        //echo $this->c;
    }
}

// 实例化
$c1 = new MyClass();

// 类外 以对象形式调用
echo  $c1 -> a;  // public
echo &#39;<br/>&#39;;
// echo  $c1 -> b;   报错
// echo  $c1 -> c;   报错

// 调用方法
$c1 -> test();

?>

Definition:

Hide the properties and implementation details of the object, only provide public calls to the outside world, and control them in the program Read and modify access levels for properties.

Access control (visibility constraints)

Achieved by adding keywords in front.

Example

<?php

class MyClass
{
    public $a =&#39;public&#39;;
    protected $b =&#39;protected&#39;;
    private $c = &#39;private&#39;;

    public function test(){
        // 类自身调用
        //echo $this->a;
        //echo $this->b;
        //echo $this->c;
    }
}

// 实例化
$c1 = new MyClass();

// 类外 以对象形式调用
echo  $c1 -> a;  // public
echo &#39;<br/>&#39;;
// echo  $c1 -> b;   报错
// echo  $c1 -> c;   报错

// 调用方法
$c1 -> test();

?>

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php object-oriented classes and instantiated objects

Basic concepts of object-oriented php

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