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| <?php | |
| class DemoSubject implements SplSubject{ | |
| private $observer, $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, $this->observers, true)) !== false){ | |
| unset($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 'This is the value :- '. $subject->getValue(); | |
| } | |
| } | |
| $subject = new DemoSubject(); | |
| $observer = new DemoObserver(); | |
| $subject->attach($observer); | |
| $subject->setValue(5); | |
| $subject->detach($observer); | |
| $subject->setValue(10); | |
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