PluginHooksService.php

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<?php

class Elgg_PluginHooksService extends Elgg_HooksRegistrationService {

    public function trigger($hook, $type, $params = null, $returnvalue = null) {
        $hooks = $this->getOrderedHandlers($hook, $type);

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

            $args = array($hook, $type, $returnvalue, $params);
            $temp_return_value = call_user_func_array($callback, $args);
            if (!is_null($temp_return_value)) {
                $returnvalue = $temp_return_value;
            }
        }

        return $returnvalue;
    }
}