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php面向对象编程之类的声明

Jun 07, 2016 pm 05:23 PM
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写在前言:这段时间在看windframework框架,感觉它的面向对象的特性较强,虽然之前我对PHP面向对象编程有一定的基础,但现在看起来似乎有点力不从心的感觉,所以我觉得很有必要系统地整理一下关于PHP面向对象编程的知识点,以便以后翻阅,同时也检查一下自己在这方面欠缺的地方,以便补上。现在就从最简单的开始,把PHP面向对象编程的知识点从头到尾走一遍。

php面向对象编程之类的声明

类是表明如何创建对象的一组指令,但它还不是一个对象,而只是对象的一个描述,它为属于该类的所有对象提供了统一的抽象描述,其内部包括属性和方法两个主要部分。在PHP面向对象的编程语言中,类是一个独立的程序单位,它应该有一个类名并包括属性说明和方法说明两个主要部分。


PHP类的声明很简单,只需使用一个关键字 class 开头,后面跟着一个自定义的类别名称,类别名称可以是任何非 PHP 保留字的名字。后面跟着一对花括号,里面包含有类成员和方法的定义。另外,有时在class关键字的前面也需要加一些修饰类的关键字,如abstract或着final等。


类的声明格式
[修饰类的关键字] class 类名{
  类的成员:
  类的方法:
}
下面创建一个名为Person的类:

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<?php

class Person{

                                     

    //下面是人的成员属性

    var $name//人的名字

    var $sex;   //人的性别

    var $age;   //人的年龄

                                         

    //下面是人的成员方法

    function say(){ //这个人可以说话的方法

                                         

        echo "这个人在说话";

    }

                                         

    function run(){ //这个人可以走路的方法

                                         

        echo "这个人在走路";

    }

}

?>

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