How to use the object-oriented magic method __call function in PHP

PHP uses the __call function of the object-oriented magic method: 1. When an inaccessible member method is called, the [__call] magic method will be called; 2. The member method does not exist and the member method When it is protected or private, the [__call] magic method is called.

PHP uses the __call function of the object-oriented magic method:

Basic introduction:

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

(2) The inaccessible member method refers to (1 . The member method does not exist, 2. The member method is protected or private)

Requirement

We just hope that inaccessible member methods can be called directly outside the class (private, protected).

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);

Exercise questions:

<?php
    header(&#39;content-type:text/html;charset=utf-8&#39;);
    /*
    练习题: 
请编写一个Cat类(有 年龄, 名字 二个属性)，要求二个属性全部都是public。
Cat类有一个 方法 jiSuan($n1, $n2, $oper) 可以计算+ - * / 是私有的.
在类外部，$对象名->play(&#39;jiSuan&#39;, $n1, $n2, $oper) 得到结果，注意play这个方法，在类中没有定义.
要求 play 是固定的，如果没有按规则写，则给出相应的错误提示!
    */
    class Cat{
        public $name;
        public $age;
        public function __construct($name, $age){
            $this->name = $name;
            $this->age = $age;
        }
        
        private function jiSuan($n1, $n2, $oper){
            
            $res = 0;
            switch($oper){
                case &#39;+&#39;:
                    $res = $n1 + $n2;
                    break;
                case &#39;-&#39;:
                    $res = $n1 - $n2;
                    break;
                case &#39;*&#39;:
                    $res = $n1 * $n2;
                    break;
                case &#39;/&#39;:
                    $res = $n1 / $n2;
                    break;
                default :
                    echo &#39;你输入的运算符号不对&#39;;
            }
            return $res;
        }
        //编写一个__call 魔术方法
        public function __call($method_name, $parameters){
            
            //先判断是否通过 &#39;play&#39; 调用
            if($method_name == &#39;play&#39;){
                //继续
                if( method_exists($this, $parameters[0]) ){
                    //继续
                    return $this->$parameters[0]($parameters[1], $parameters[2], $parameters[3]);
                }else{
                    return &#39; 你调用的 &#39; . $parameters[0] . &#39; 不存在&#39;;
                }
            }else{
                return &#39; 你调用的方式有问题 &#39;;
            }
        }
    }
    $cat = new Cat(&#39;小花猫&#39;, 3);
    echo &#39;<br> 运算的结果是 &#39; . $cat->play(&#39;jiSuan&#39;, 10, 20, &#39;-&#39;);

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