Introduction to php object dependencies

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

Methods through constructors

 1 <?php 
 2 //定义一个类，后面的类依赖这个类里面的方法 
 3 class play 
 4 { 
 5     public function playing() 
 6     { 
 7         echo "I can playing"; 
 8     } 
 9 }
 10 
 11 class video
 12 {
 13     private $action;//定义私有属性
 14     public function __construct($a)//将对象做参数
 15     {
 16         return $this->action = $a;
 17     }
 18     //通过方法访问类中的私有属性
 19     public function getaction()
 20     {
 21         $this->action->playing();22     }
 23 }
 24 
 25 $ply = new play();
 26 $vid = new video($ply);
 27 $vid->getaction();//输出I can playing

Through attributes

<?php
//定义一个类，后面的类依赖这个类里面的方法
class play
{    
public function playing()
    {        
    echo "I can playing";
    }
}class video
{    private $action;//定义私有属性
    public function __set($param, $a)
    //通过__set()方法设置属性值    
    {        
    return $this->action = $a;
    }    //通过方法访问类中的私有属性
    public function getaction()
    {       return $this->action->playing();
    }
}$ply = new play();//实例化play类后面做参数
$vid = new video();
$vid->action = $ply;//当访问video为定义的属性值时会调用__set()方法(不懂的可以看看php的魔术方法)
$vid->getaction();//输出I can playing

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