protected function sanitizeArray($array)
    {
        foreach($array as $key => $value){
            if(is_array($value)){
                $array[$key] = $this->sanitizeArray($value);
            } else {
                $array[$key] = $this->convertStaticPhpExcelConstantsFromStringsToConstants($value);
            }
        }

        return $array;
    }