Which category does php's __call function belong to?

php's __call() function is a magic function. The so-called PHP magic function simply means that it has a specific name in PHP - all starting with two underscores, and the PHP interpreter will A method to automatically find and run when a certain timing is reached.

When we call an inaccessible member method, the __call magic method will be called.

No The accessed member method refers to (1. The member method does not exist, 2. The member method is protected or private) (Recommended learning: PHP Video Tutorial)

We just hope that in Directly call inaccessible member methods (private, protected) from outside the class.

Case Description

<?php
    header(&#39;content-type:text/html;charset=utf-8&#39;);
    //__call魔术方法

     class Monk{
        public $name;
        protected $hobby;

        public function __construct($name, $hobby){
            $this->name = $name;
            $this->hobby = $hobby;
        }
        
        //输出该对象的信息
        public function showInfo(){
            
            echo &#39;<br> 名字是 &#39; . $this->name;
            foreach($this->hobby as $hobby){
                echo &#39;<br> 爱好有 &#39; . $hobby;
            }
        }

        //会做算术题, 保护的
        protected function getSum($num1, $num2){
            
            return $num1 + $num2;
        }

        //编写这个__call魔术方法， __call 魔术方法会接收到两个参数
        /*
            @param $method_name 就是函数名
            @param $parameters 就是参数，类型是array
        */
        public function __call($method_name, $parameters){
            
//            echo &#39;<br> method_name = &#39; . $method_name;
//            echo &#39;<br> $parameters <br>&#39;;
//            var_dump($parameters);
            
            //判断 $this 中是否有  $method_name 函数，有就返回true,否则返回false
            if(method_exists($this, $method_name)){

                return $this->$method_name($parameters[0], $parameters[1]);
            }else{
                return &#39;没有你要调用的函数&#39;;
            }
            
        }
     }

     $monk = new Monk(&#39;济公&#39;, array(&#39;no1&#39;=>&#39;腾云驾雾&#39;, &#39;no2&#39;=>&#39;喝酒&#39;));

     $monk->showInfo();

     //当我们直接调用 protected 方法时，就会触发 __call 魔术方法
     echo &#39;<br> 结果是&#39; . $monk->getSum(100, 200);

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