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首页 > 资讯列表 > 编程/数据库 >> PHP

PHP 高级课程笔记 面向对象

PHP 2014-12-12 15:15:13 转载来源: 网络整理/侵权必删

第一节课，讲的是面向对象的基本知识，介绍了类的封装，类的继承，对象，类的定义和使用，类的结构，成员方法，成员变量与属性等零碎知识，这里只是把几个例子的源代码贴出来，仅供参考。 例一： <?php // 类的定义 class User { // 属性,注意public、private、protected的作用范围 public $name = "hackbaby"; // 构造函数 function __construct() { echo "construct<br />"; } // 方法 function say() { echo "这是在类的本身调用：$this->name"; } // 析构函数 function __destruct() { echo "destruct"; } // 返回当前对象的描述信息 通过实例化的变量名调用例如本例中的$user function __toString() { return

第一节课，讲的是面向对象的基本知识，介绍了类的封装，类的继承，对象，类的定义和使用，类的结构，成员方法，成员变量与属性等零碎知识，这里只是把几个例子的源代码贴出来，仅供参考。
例一：


<?php
// 类的定义
class User
{
// 属性,注意public、private、protected的作用范围
public $name = "hackbaby";
// 构造函数
function __construct()
{
echo "construct<br />";
}
// 方法
function say()
{
echo "这是在类的本身调用：$this->name";
}
// 析构函数
function __destruct()
{
echo "destruct";
}
// 返回当前对象的描述信息 通过实例化的变量名调用例如本例中的$user
function __toString()
{
return "user class";
}
}
//实例化，如果构造函数有参数则用$user = new User('参数');
$user = new User();
echo $user->name . "<hr />";
$user->say();
echo "<hr />";
echo $user;
?>


例二：

 

 


<?php
class Fruit
{
protected $fruit_color;
protected $fruit_size;

function setcolor($color)
{
$this->fruit_color = $color;
}

function getcolor()
{
return $this->fruit_color;
}

function setsize($size)
{
$this->fruit_size = $size;
}

function getsize()
{
return $this->fruit_size;
}

function save()
{
//代码
}
}
class apple extends Fruit
{
private $variety;

function setvariety($type)
{
$this->variety = $type;
}

function getvariety()
{
return $this->variety;
}
}
$apple = new apple();
echo $apple->setvariety('红富士');
echo $apple->getvariety();
echo "<br />";
echo $apple->setcolor('red');
echo $apple->getcolor();
echo "<br />";
echo $apple->setsize('特大');
echo $apple->getsize();

?>

 

 


标签: PHP 高级 课程 笔记 面向 对象


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