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<?php /** Object responsible for echoing debug data **/ class EchoLogger implements \SplObserver { public function update(\SplSubject $subject) { printf("Rand: %s, Status: %s", $subject->getRand(), $subject->getStatus()); } } /** Object responsible for emailing debug data **/ class EmailLogger implements \SplObserver { public function update(\SplSubject $subject) { /** Mail your data **/ } } class HttpClientService implements \SplSubject { private $observers = array(); public function getRand() { return $this->rand; } public function getStatus() { return $this->status; } public function attach(\SplObserver $observer) { $this->observers[] = $observer; } public function detach(\SplObserver $observer) { if($key = array_search($observer,$this->observers, true)) { unset($this->observers[$key]); } } public function notify() { foreach ($this->observers as $observer) { $observer->update($this); } } public function getServiceStatus() { // -- SNIP -- $this->rand = rand(0, 10); $this->status = ($this->rand >= 5) ? 'success' : 'error'; // -- Snip -- return $this->status; } } $service = new HttpClientService; $service->attach(new EchoLogger); $service->getServiceStatus();

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