为什么我按老师讲的浏览器里输出了peter.老师的却没有？

为什么我按老师讲的浏览器里输出了peter.老师的却没有？

class Staff{ private $anme; private $age; private $salary;

public function __construct($name,$age,$salary) { $this -> name = $name; $this -> age  =$age; $this -> salary =$salary; }}

$obj =new Staff('peter',28,5000);


echo $obj ->name;