SPL库-观察者模式
<?php
/**
* @author :KangYunChuan
* @name :观察者模式
*
*/
class DemoSubject implements SplSubject {
private $observers,$value;
public function __construct(){
$this->observers = array();
}
public function attach(SplObserver $observer){
/**
* 把SplObserver对象存入数组
*/
$this->observers[] = $observer;
}
public function detach(SplObserver $observer){
if ($idx = array_search($observer,$this->observers,true)) {
unset($this->observers[$idx]);
}
}
public function notify(){
/**
* 遍历SplObserver对象生成的数组
*/
foreach ($this->observers as $observer){
$observer->update($this);
}
}
public function setValue($value){
$this->value = $value;
$this->notify();
}
public function getValue(){
return $this->value;
}
}
class DemoObserver implements SplObserver {
public function update(SplSubject $subject){
echo 'The new value is '.$subject->getValue();
}
}
$subject = new DemoSubject();
$observer = new DemoObserver();
$subject->attach($observer);
$subject->setValue(5);
?>
