Box\Spout\Reader\Common\XMLProcessor::getCallbackKey PHP Метод

private getCallbackKey ( string $nodeName, integer $nodeType ) : string
$nodeName	string	Name of the node
$nodeType	integer	Type of the node [NODE_TYPE_START \|\| NODE_TYPE_END]
Результат	string	Key used to store the associated callback

    private function getCallbackKey($nodeName, $nodeType)
    {
        return "{$nodeName}{$nodeType}";
    }

XMLProcessor