<?php
class User implements SplSubject{
public $loginNum;
public $hobby;
public $observers = null;
public function __construct($hobby){
$this->loginNum = rand(1,10);
$this->hobby = $hobby;
$this->observers = new SplObjectStorage();
}
public function attach(SplObserver $observer){
$this->observers->attach($observer);
}
public function detach(SplObserver $observer){
$this->observers->detach($observer);
}
public function notify(){
$this->observers->rewind();
while($this->observers->valid()){
$observer = $this->observers->current();
$observer->update($this);
$this->observers->next();
}
}
public function login(){
$this->notify();
}
}
class Secrity implements SplObserver{
public function update(SplSubject $subject){
echo "第".$subject->loginNum."次登陆";
}
}
class Ad implements SplObserver{
public function update(SplSubject $subject){
echo "爱好".$subject->hobby;
}
}
$user = new User("篮球");
$user->attach(new Secrity());
$user->attach(new Ad());
$user->login();
下面通过观察者模式实现登陆
index.php
<html>
<head></head>
<body>
<form action="main.php" method="post">
姓名：<input type="text" name="name"/><br/>
密码：<input type="password" name="password"/>
<input type="submit" value="登陆"/>
</form>
</body>
</html>
main.php
<?php
class User implements SplSubject{
public $name;
public $password;
public $observers = null;
public function __construct($name,$password){
$this->name = $name;
$this->password = $password;
$this->observers = new SplObjectStorage();
}
public function attach(SplObserver $observer){
$this->observers->attach($observer);
}
public function detach(SplObserver $observer){
$this->observers->detach($observer);
}
public function notify(){
$this->observers->rewind();
while($this->observers->valid()){
$observer = $this->observers->current();
$observer->update($this);
$this->observers->next();
}
}
public function login(){
$this->notify();
}
}
class Validate implements SplObserver{
public function update(SplSubject $subject){
if($subject->name=="shenming" && $subject->password=="shenm"){
echo "success";
}else{
echo "false";
}
}
}
$name=$_POST['name'];
$password=$_POST['password'];
$user = new User($name,$password);
$user->attach(new Validate());
$user->login();