private function normaliseCallbackString(string $callback) : string
    {
        @list($controller, $method) = explode('@', $callback);

        if (class_exists($this->defaultControllerNamespace . $controller)) {
            return $this->defaultControllerNamespace . $callback;
        }

        return $callback;
    }
private function normaliseCallbackString(string $callback) : string
    {
        @list($controller, $method) = explode('@', $callback);

        if (class_exists($this->defaultControllerNamespace . $controller)) {
            return $this->defaultControllerNamespace . $callback;
        }

        return $callback;
    }
private function normaliseCallbackString ( string $ callback ) : string { @ list ( $ controller , $ method ) = explode ( '@' , $ callback ) ; if ( class_exists ( $ this -> defaultControllerNamespace . $ controller ) ) { return $ this -> defaultControllerNamespace . $ callback ; } return $ callback ; }
Add the default namespace to the Controller classname if required

@param  string $callback
@return string
Add the default namespace to the Controller classname if required