if ($this->label_formfunc != '') {
                        $f                         = $this->label_formfunc;
                        $this->maj_ticks_label[$i] = call_user_func($f, $nextMajor);
                    } elseif ($this->label_logtype == 0) {
                        $this->maj_ticks_label[$i] = $nextMajor;