上次使用了纯php实现了一个观察者模式（php观察者模式）， 现在使用php标准库spl在次实现观察者模式，好处是：随意的生成您想使用的观察者！
<?php/** * Created by PhpStorm. * User: evolution * Date: 14-12-27 * Time: 下午5:50 */class Login implements SplSubject { private $storage; public $status; public $ip; const LOGIN_ACCESS = 1; const LOGIN_WRONG_PASS = 2; const LOGIN_USER_UNKNOWN = 3; function __construct(){ $this->storage = new SplObjectStorage(); } function attach (SplObserver $observer) { $this->storage->attach($observer); } function detach(SplObserver $observer){ $this->storage->detach($observer); } function notify(){ foreach ($this->storage 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; }}/** * 只针对登陆的贯观察者 * Class LoginObserver */abstract class LoginObserver implements SplObserver { private $login; function __construct(Login $login){ $this->login = $login; $login->attach($this); } /** * 对外统一的访问点 * @param SplSubject $subject */ function update( SplSubject $subject ){ if($subject === $this->login){ $this->doUpdate($subject); } } abstract function doUpdate( Login $login );}/** * Class EmailObserver */class EmailObserver extends LoginObserver{ //不同功能的观察者实现不同的功能 function doUpdate( Login $login ){ $status = $login->getStatus(); if($status == Login::LOGIN_ACCESS){// $this->sendMail('用户ip:'.$observable->ip.'登陆成功!'); echo __CLASS__.'用户ip:'.$login->ip.'登陆成功!'.'------------------'; } if($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:'.$login->ip.'登陆失败，密码错误!'.'------------------'; } if($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:'.$login->ip.'登陆失败，无此用户!'.'------------------'; } }}//实例化登陆信息$login = new Login();//实现发邮件观察者new EmailObserver($login);//开始登陆$login->handleLogin(); 
