php学习笔记 类的声明与对象实例化
复制代码 代码如下:
/* 类的声明
* 1.你要开发的是什么,确定写什么类
* 2.类中的成员一定要属于这个类
* [修饰类的关键字] class 类名{
* 成员属性:
* 成员方法:
* }
* 3.在类中声明成员属性时,前面必须有修饰词,当不确定使用哪个词时,使用var或public
* 一个文件只保存一个类,文件名中包含类名,文件:类名.class.php
* 类名的写法:
* 变量:aaaBbbCcc
* 函数:aaaBbbCcc
* 常量:AAABBBCCC
* 类名:AaaBbbCcc
* 4.类中的成员属性,如果创建多个对象时,每个对象有不同的属性值时,不要直接给初值,在创建好对象之后再给值
*
*
* 通过类来实例化对象
* 1.使用的是new新建一个对象,加上类名,就是创建哪个类的对象
* $对象引用=new 类名;
* 2.只要有一个new 关键字就是创建一个对象,创建一个对象就是在内存中分配了一个空间
*
* 只有对象才在内存有存储空间
*
* 对象的作用
*
* 对象在内存中的分配
*
* 对象的使用
* 对象中的成员必须通过对象的引用来访问
* 对象->成员
*
* 对象->成员属性
* 对象->成员方法
*
*
*
*/
//类的声明(电话类)
class Phone{
//声明属性
var $pinPai;
var $color;
var $batteryCapacity;
var $screenSize;
//成员方法
function call(){
}
function message(){
}
function playMusic(){
}
function photo(){
}
}
//类的实例化
class Person{
var $name;
var $age;
var $sex;
function say(){
}
function eat(){
}
function run(){
}
}
//实例化
$p1=new Person;
$p2=new Person;
$p3=new Person;
//访问对象的成员
$p1->name="zhangsan";
echo $p1->name;
?>

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