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observer.php

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<?php

interface IObserver {

function onChanged( $sender, $args );

}

interface IObservable {

function addObserver( $observer );

}

class UserList implements IObservable {

private $_observers = array();

public function addCustomer( $name ) {

foreach( $this->_observers as $obs )

$obs->onChanged( $this, $name );

}

public function addObserver( $observer ) {

$this->_observers []= $observer;

}

}

class UserListLogger implements IObserver {

public function onChanged( $sender, $args ) {

echo( "'$args' added to user list\n" );

}

}

$ul = new UserList();

$ul->addObserver( new UserListLogger() );

$ul->addCustomer( "Jack" );

$ul->addCustomer( "Anit" );

?>