php观察者模式入门例子
时间：2021-07-01 10:21:17
帮助过：19人阅读
- class DemoSubject implements SplSubject{
- private $observers, $value;
-
- public function __construct(){
- $this->observers = array();
- }
-
- public function attach(SplObserver $observer){
- $this->observers[] = $observer;
- }
-
- public function detach(SplObserver $observer){
- if($idx = array_search($observer, $this->observers, true)){
- unset($this->observers[$idx]);
- }
- }
-
- public function notify(){
- foreach($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);
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