新人学习PHP有关问题，发现书上代码不对

新人学习PHP问题，发现书上代码不对
在书上发现一段代码，敲下来后发现不对。。

	{
		private $name;
		private $sex;
		private $age;
		
		function __construct($name="",$sex="男",$age=23)
		{
			$this->name=$name;
			$this->sex=$sex;
			$this->age=$age;
		}
		function say()
		{
			echo "我的名字  ".$this->name."，性别  ".$this->sex."，年龄  ".$this->age."
";
		}
		function run()
		{
			echo $this->name."正在走路
";
		}
	}

	class Student extends Person 
	{
		var $school;
		function study()
		{
			echo $this->name."正在".$this->school."学习
";
		}
	}
	class Teacher extends Student 
	{
		var $wage;
		function teaching()
		{
			echo  $this->sex."正在".$this->school."教学，每个月工资为".$this->wage."
";
		}
	}
	$teacher1=new Teacher("张三","男",40);
	$teacher1->school="沈阳工学院";
	$teacher1->wage=3000;
	
	$teacher1->say();
	$teacher1->run();
	$teacher1->teaching();
?>

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这里Teacher类中的teaching方法或不去不到$this->name。。书上却写可以获取的到，是我哪里写错了吗？

PHP?基础 继承

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------解决方案--------------------
private $name;
private $sex;
private $age;
private改成public