EventsService.php

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<?php

class Elgg_EventsService extends Elgg_HooksRegistrationService {

    const OPTION_STOPPABLE = 'stoppable';
    const OPTION_DEPRECATION_MESSAGE = 'deprecation_message';
    const OPTION_DEPRECATION_VERSION = 'deprecation_version';

    public function trigger($event, $type, $object = null, array $options = array()) {
        $options = array_merge(array(
            self::OPTION_STOPPABLE => true,
            self::OPTION_DEPRECATION_MESSAGE => '',
            self::OPTION_DEPRECATION_VERSION => '',
        ), $options);

        $events = $this->hasHandler($event, $type);
        if ($events && $options[self::OPTION_DEPRECATION_MESSAGE]) {
            elgg_deprecated_notice(
                $options[self::OPTION_DEPRECATION_MESSAGE],
                $options[self::OPTION_DEPRECATION_VERSION],
                2
            );
        }

        $events = $this->getOrderedHandlers($event, $type);
        $args = array($event, $type, $object);

        foreach ($events as $callback) {
            if (!is_callable($callback)) {
                if ($this->logger) {
                    $this->logger->warn("handler for event [$event, $type] is not callable: "
                                        . $this->describeCallable($callback));
                }
                continue;
            }

            $return = call_user_func_array($callback, $args);
            if (!empty($options[self::OPTION_STOPPABLE]) && ($return === false)) {
                return false;
            }
        }

        return true;
    }
}