public function addCustomer($name)
{
foreach ($this->_observers as $obs) {
$obs->onChanged($this, $name);
}
}
public function addObserver($observer)
{
$this->_observers[] = $observer;
}
}
class CustomerListLogger implements Observer
{
public function onChanged($sender, $args)
{
echo 'Logger:' . $args . ' Customer has been added to the list' . PHP_EOL;
}
}
class CustomerListUpdate implements Observer
{
public function onChanged($sender, $args)
{
echo 'MySQL update: insert ' . $args . ' into Customer table ' . PHP_EOL;
echo '--------------------' . PHP_EOL;
}
}
$cl = new CustomerList();
$cl->addObserver(new CustomerListLogger());
$cl->addObserver(new CustomerListUpdate());
$cl->addCustomer('Jack');
$cl->addCustomer('Lee');
