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    <p>Here is an approach I've used, it's an attempt to copy from Qt signals/slots mechanism, a kind of Observer pattern. Objects can emit signals. Every signal has an ID in the system - it's composed by sender's id + object name Every signal can be binded to the receivers, which simply is a "callable" You use a bus class to pass the signals to anybody interested in receiving them When something happens, you "send" a signal. Below is and example implementation</p> <pre><code> &lt;?php class SignalsHandler { /** * hash of senders/signals to slots * * @var array */ private static $connections = array(); /** * current sender * * @var class|object */ private static $sender; /** * connects an object/signal with a slot * * @param class|object $sender * @param string $signal * @param callable $slot */ public static function connect($sender, $signal, $slot) { if (is_object($sender)) { self::$connections[spl_object_hash($sender)][$signal][] = $slot; } else { self::$connections[md5($sender)][$signal][] = $slot; } } /** * sends a signal, so all connected slots are called * * @param class|object $sender * @param string $signal * @param array $params */ public static function signal($sender, $signal, $params = array()) { self::$sender = $sender; if (is_object($sender)) { if ( ! isset(self::$connections[spl_object_hash($sender)][$signal])) { return; } foreach (self::$connections[spl_object_hash($sender)][$signal] as $slot) { call_user_func_array($slot, (array)$params); } } else { if ( ! isset(self::$connections[md5($sender)][$signal])) { return; } foreach (self::$connections[md5($sender)][$signal] as $slot) { call_user_func_array($slot, (array)$params); } } self::$sender = null; } /** * returns a current signal sender * * @return class|object */ public static function sender() { return self::$sender; } } class User { public function login() { /** * try to login */ if ( ! $logged ) { SignalsHandler::signal(this, 'loginFailed', 'login failed - username not valid' ); } } } class App { public static function onFailedLogin($message) { print $message; } } $user = new User(); SignalsHandler::connect($user, 'loginFailed', array($Log, 'writeLog')); SignalsHandler::connect($user, 'loginFailed', array('App', 'onFailedLogin')); $user-&gt;login(); ?&gt; </code></pre>
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