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。。
<br><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><br><?php<br> class Person<br> {<br> private $name;<br> private $sex;<br> private $age;<br> <br> function __construct($name="",$sex="男",$age=23)<br> {<br> $this->name=$name;<br> $this->sex=$sex;<br> $this->age=$age;<br> }<br> function say()<br> {<br> echo "我的名字 ".$this->name."，性别 ".$this->sex."，年龄 ".$this->age."<br>";<br> }<br> function run()<br> {<br> echo $this->name."正在走路<br>";<br> }<br> }<br><br> class Student extends Person <br> {<br> var $school;<br> function study()<br> {<br> echo $this->name."正在".$this->school."学习<br>";<br> }<br> }<br> class Teacher extends Student <br> {<br> var $wage;<br> function teaching()<br> {<br> echo $this->sex."正在".$this->school."教学，每个月工资为".$this->wage."<br>";<br> }<br> }<br> $teacher1=new Teacher("张三","男",40);<br> $teacher1->school="沈阳工学院";<br> $teacher1->wage=3000;<br> <br> $teacher1->say();<br> $teacher1->run();<br> $teacher1->teaching();<br>?><br>这里teacher类中的teaching方法或不去不到$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
