1 <?php
  2 /**
  3  * 观察者模式(被观察者)
  4  * 
  5  * @author Administrator
  6  *
  7 */
  8 class Subject implements SplSubject {
  9 
 10     /**
 11      * 设置的参数
 12      * 
 13      * @var mixed
 14 */
 15     protected $_value;
 16 
 17     /**
 18      * 
 19      * 
 20      * @var SplObjectStorage
 21 */
 22     protected $_observers;
 23 
 24     /**
 25      * 构造函数
 26      * 
 27      * @return void
 28 */
 29     public function __construct() {
 30         $this->_observers = new SplObjectStorage();
 31     }
 32 
 33     /**
 34      * (non-PHPdoc)
 35      * @see SplSubject::attach()
 36 */
 37     public function attach(SplObserver $observer) {
 38         $this->_observers->attach($observer);
 39     }
 40 
 41     /**
 42      * (non-PHPdoc)
 43      * @see SplSubject::detach()
 44 */
 45     public function detach(SplObserver $observer) {
 46         $this->_observers->detach($observer);
 47     }
 48 
 49     /**
 50      * (non-PHPdoc)
 51      * @see SplSubject::notify()
 52 */
 53     public function notify() {
 54         foreach ($this->_observers as $observer) {
 55             $observer->update($this);
 56         }
 57     }
 58 
 59     /**
 60      * 设置最新值
 61      * 
 62      * @param mixed $value
 63      * @return 
 64 */
 65     public function setValue($value) {
 66         $this->_value = $value;
 67         $this->notify();
 68     }
 69 
 70     /**
 71      * 获取最后更新的值
 72      * 
 73      * @return mixed
 74 */
 75     public function getValue() {
 76         return $this->_value;
 77     }
 78 }
 79 
 80 /**
 81  * 观察者模式(观察者)
 82  * 
 83  * @author Administrator
 84  *
 85 */
 86 class Observer implements SplObserver {
 87 
 88     /**
 89      * (non-PHPdoc)
 90      * @see SplObserver::update()
 91 */
 92     public function update(SplSubject $subject) {
 93         var_dump('最后更新时间为:' . $subject->getValue());
 94     }
 95 }
 96 
 97 date_default_timezone_set('Asia/Shanghai');
 98 error_reporting(E_ALL);
 99 $subject = new Subject();
100 $observer = new Observer();
101 $subject->attach($observer);
102 $subject->setValue(date('Y-m-d H:i:s', time()));