PHP 实现重载

方法一：自定义一个方法，根据传入参数的数量，对应到某一个方法中

class Overloading{
    public function test()
    {
      $nums = func_num_args(); //传入参数数量
      $args = func_get_args(); //传参数组
      switch ($nums) {
        case 1:
          $this->test1($args[0]);
          break;
        case 2:
          $this->test2($args[0], $args[1]);
          break;
        default:
          throw new Exception("Not Found Action");
          break;
      }
    }

    private function test1($arg0)
    {
      echo __METHOD__;
    }
    private function test2($arg0, $arg1)
    {
      echo __METHOD__;
    }
  }
  $obj = new Overloading();
  $obj->test(1);
  $obj->test(1,2);

方法二：使用__call魔术方法，根据传入参数的数量，回调调用其他一个方法

class Overloading{
//定义魔术方法
    public function __call($name, $args) 
    {
       if($name == 'test'){
        switch (count($args)) {
          case 1:
            call_user_func_array([$this,'test1'], $args);
            break;
          case 2:
            call_user_func_array('self::test2', $args);
            break;          
          default:
            throw new Exception("Not Found Action");
            break;
        }
       }
    }
    //静态魔术方法
    public static function __callStatic($name, $args)
    {

    }

    private function test1($arg0)
    {
      echo __METHOD__;
    }
    private function test2($arg0, $arg1)
    {
      echo __METHOD__;
    }
  }

  $obj = new Overloading();
  $obj->test(1);
  $obj->test(1,2);