__get和__set代碼的問題

Question

我不知道我在哪裏做錯了。有人可以告訴我嗎？

<?php 
    class something 
    { 
     public $attr1; 
     private $attr2; 

     public function __get($name) 
     { 
      return $this->$name; 
     } 

     public function __set($name,$value) 
     { 
      $this->$name = $value." added something more"; 
     } 
    } 

    $a = new something(); 

    $a->$attr1 = "attr1"; 
    $a->$attr2 = "attr2"; 

    echo $a->$attr1; //what I would expect is attr1 as output 
    echo $a->$attr2; //what I would expect is attr2 added something more as output 
?> 

Answer 1

訪問對象的屬性時，請取下的$的多個實例：

$a->$attr1 = "attr1";   $a->attr1 = "attr1"; 
$a->$attr2 = "attr2";   $a->attr2 = "attr2"; 

echo $a->$attr1;    echo $a->attr1; 
echo $a->$attr2;    echo $a->attr2;