我要评论本文实例讲述了php设计模式之观察者模式定义与用法。分享给大家供大家参考，具体如下：
<?php
/**
* interface observable
* define a observable interface
* @author jichao.wang
*/
interface observable
{
function attach(observer $observer);
function detach(observer $observer);
function notify();
}
/**
* class login
* @author jichao.wang
*/
class login implements observable
{
private $observers;
public $status;
public $ip;
const login_access = 1;
const login_wrong_pass = 2;
const login_user_unknown = 3;
function __construct()
{
$this->observers = array();
}
/**
* @param observer $observer
* @author jichao.wang
* attach a observer
*/
function attach(observer $observer)
{
$this->observers[] = $observer;
}
/**
* @param observer $observer
* @author jichao.wang
* detach a observer
*/
function detach(observer $observer)
{
$newobservers = array();
foreach ($this->observers as $key => $obs) {
if ($obs !== $observer) {
$newobservers[] = $obs;
}
}
$this->observers = $newobservers;
}
/**
* @author jichao.wang
* handle observer notify
*/
function notify()
{
foreach ($this->observers as $obs) {
$obs->update($this);
}
}
/**
* @author jichao.wang
* 执行登陆
*/
function handlelogin()
{
$ip = rand(1,100);
switch (rand(1, 3)) {
case 1:
$this->setstatus(self::login_access, $ip);
$ret = true;
break;
case 2:
$this->setstatus(self::login_wrong_pass, $ip);
$ret = false;
break;
case 3:
$this->setstatus(self::login_user_unknown, $ip);
$ret = false;
break;
}
/**
* handle event
*/
$this->notify();
return $ret;
}
/**
* @param $status
* @author jichao.wang
* set login status
*/
function setstatus($status,$ip)
{
$this->status = $status;
$this->ip = $ip;
}
/**
* @return mixed
* @author jichao.wang
* get login status
*/
function getstatus()
{
return $this->status;
}
}
/**
* interface observer
* @author jichao.wang
*/
interface observer {
function update(observable $observable);
}
/**
* class emailobserver
* @author jichao.wang
*/
class emailobserver implements observer {
function update (observable $observable) {
$status = $observable->getstatus();
if($status == login::login_access){
// $this->sendmail('用户ip:'.$observable->ip.'登陆成功!');
echo __class__.'用户ip:'.$observable->ip.'登陆成功!'.'------------------';
}
if($status == login::login_wrong_pass){
// $this->sendmail('用户ip:'.$observable->ip.'登陆失败，密码错误!');
echo __class__.'用户ip:'.$observable->ip.'登陆失败，密码错误!'.'------------------';
}
if($status == login::login_user_unknown){
// $this->sendmail('用户ip:'.$observable->ip.'登陆失败，无此用户!');
echo __class__.'用户ip:'.$observable->ip.'登陆失败，无此用户!'.'------------------';
}
}
}
/**
* class phoneobserver
* @author jichao.wang
*/
class phoneobserver implements observer {
function update (observable $observable) {
$status = $observable->getstatus();
if($status == login::login_access){
// $this->sendmail('用户ip:'.$observable->ip.'登陆成功!');
echo __class__.'用户ip:'.$observable->ip.'登陆成功!'.'------------------';
}
if($status == login::login_wrong_pass){
// $this->sendmail('用户ip:'.$observable->ip.'登陆失败，密码错误!');
echo __class__.'用户ip:'.$observable->ip.'登陆失败，密码错误!'.'------------------';
}
if($status == login::login_user_unknown){
// $this->sendmail('用户ip:'.$observable->ip.'登陆失败，无此用户!');
echo __class__.'用户ip:'.$observable->ip.'登陆失败，无此用户!'.'------------------';
}
}
}
class abcobserver implements observer {
function update (observable $observable) {
$status = $observable->getstatus();
if($status == login::login_access){
// $this->sendmail('用户ip:'.$observable->ip.'登陆成功!');
echo __class__.'用户ip:'.$observable->ip.'登陆成功!'.'------------------';
}
if($status == login::login_wrong_pass){
// $this->sendmail('用户ip:'.$observable->ip.'登陆失败，密码错误!');
echo __class__.'用户ip:'.$observable->ip.'登陆失败，密码错误!'.'------------------';
}
if($status == login::login_user_unknown){
// $this->sendmail('用户ip:'.$observable->ip.'登陆失败，无此用户!');
echo __class__.'用户ip:'.$observable->ip.'登陆失败，无此用户!'.'------------------';
}
}
}
//实例化登陆信息
$login = new login();
//实现发邮件观察者
$login->attach(new emailobserver());
//实现发验证码观察者
$login->attach(new phoneobserver());
//实现其他观察者
$login->attach(new abcobserver());
//开始登陆
$login->handlelogin();
?>
运行结果：
emailobserver用户ip:41登陆失败，无此用户!------------------phoneobserver用户ip:41登陆失败，无此用户!------------------abcobserver用户ip:41登陆失败，无此用户!------------------
更多关于php相关内容感兴趣的读者可查看本站专题：《php面向对象程序设计入门教程》、《php数组(array)操作技巧大全》、《php基本语法入门教程》、《php运算与运算符用法总结》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》
希望本文所述对大家php程序设计有所帮助。
您可能感兴趣的文章:
如您对本文有疑问或者有任何想说的，请 点击进行留言回复，万千网友为您解惑！
网友评论