//观察者形式
classObserver
{
public$observers;
publicfunctionsetState()
{
$this->notifyAll();
}
privatefunctionnotifyAll()
{
if(empty($this->observers))returnnull;
foreach($this->observersas$key=>$value){
$className=$key;
$funcName=$value;
if(method_exists($className,$funcName))
{
call_user_func(array($className,$funcName));
}
}
}
}
classBinaryObserverextendsObserver
{
public$subject;
function__construct($subject)
{
$this->subject=$subject;
$this->subject->observers['BinaryObserver']='update';
}
protectedfunctionupdate()
{
echo"BinaryString:<br/>";
}
}
classOctalObserverextendsObserver
{
public$subject;
function__construct($subject)
{
$this->subject=$subject;
$this->subject->observers['OctalObserver']='update';
//var_dump($this->subject->observers);
}
protectedfunctionupdate()
{
echo"OctalString:<br/>";
}
}
$subject=newObserver();
newBinaryObserver($subject);
newOctalObserver($subject);
$subject->setState();
