An example of understanding PHP object-oriented programming (OOP)

<span>php<br></span><span>class</span><span> Person{<br>        //声明一个新变量公共变量$name，可被任何包中的类访问<br></span><span>public</span><span>$name</span><span>;
        </span><span>public</span><span>$sex</span><span>;
        </span><span>public</span><span>$age</span><span>;<br>        //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>    //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>?>

The browser output is as follows:

Hello!
My name is: Zhang San
My gender is: Male
My age is: 18
I am studying in a certain school.

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