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 />
