类：在任何其他函数之前自动调用“before - function”

Question

I'm trying to make some kind of error-handler in one of my classes. Therefore my class has a $error variable. If it is true, it should print a message.

This procedure shoud happen everytime before a function of this class is called

I have tried the approach of the magic method __call(), mentioned in this answer: SO Answer

Unfortunately it doesn't work.

class XXX extends YYY{
   public $error;
   public $var;

   function __construct($var)
   {
      $this->var = $var;
      $this->error = true; //test the error process
   }

   private function before(){
      if($this->error)
      {
         echo "something went wrong"; die;
      }
   }

   private function test(){
      echo "test", PHP_EOL;
   }

   public function __call($method,$arguments) {
       if(method_exists($this, $method)) {
           $this->before();
           return call_user_func_array(array($this,$method),$arguments);
       }
   }
}

When I call:

$a = new XXX($var);
$a->test();

The output is still:

/*
* Output:
* test
*/

Any Ideas would be very appreciated.

Thanks