<?<span>php<br /><br />
</span><span>class</span><span> Person{<br /><br /> //声明一个新变量公共变量<strong>$name</strong>，可被任何包中的类访问<br /> </span><span>public</span> <span>$name</span><span>;
</span><span>public</span> <span>$sex</span><span>;
</span><span>public</span> <span>$age</span><span>;<br /><br /> //声明该类的一个方法
</span><span>function</span><span> say() {
</span><span>echo</span> "你好！<br />"<span>;
</span><span>echo</span> "我的的名字是：" . <span>$this</span> -> name ."<br />"<span>;
</span><span>echo</span> "我的性别是：" . <span>$this</span> -> sex ."<br />"<span>;
}
}
<br /> //声明新的Student类为Person的子类
</span><span>class</span> Student <span>extends</span><span> Person{
</span><span>public</span> <span>$school</span><span>;
</span><span>function</span><span> study() {<br /> //parent:: 可用于调用父类中定义的成员方法。<br /> parent::say();</span><span>echo</span> "我的年龄是：" . <span>$this</span> -> age . "<br />我正在" . <span>$this</span> -> school . "上学。"<span>;
}
}
<br /> //只用将P1定义为学生类即可
</span><span>$p1</span> = <span>new</span><span> Student();<br /><br /> //为P1的name，sex，age，school属性赋值
</span><span>$p1</span> -> name = "张三"<span>;
</span><span>$p1</span> -> sex = "男"<span>;
</span><span>$p1</span> -> age = "18"<span>;
</span><span>$p1</span> -> school = "某某学校"<span>;
</span><span>$p1</span> -><span> study();
</span>?>
浏览器输出结果如下：
你好！
我的的名字是：张三
我的性别是：男
我的年龄是：18
我正在某某学校上学。
