189             foreach ($year as $mth_num => $month) {
192                     $mth_num,
225         $mth_num,  argument
234         $cal .= $this->getMonthNameHTML($mth_num);
242 …              $cal .= $this->getDayHTML($cur_day, $mth_num, $today, $year_num, $weekday_num, $opt);
255      * @param int   $mth_num     Month 1..12
263     public function getDayHTML($cur_day, $mth_num, $today, $year_num, $weekday_num, $opt)  argument
273         $month_fmt = sprintf("%02d", $mth_num);
276         $current = mktime(0, 0, 0, $mth_num, $cur_day, $year_num);
308     protected function getMonthNameHTML($mth_num)  argument
324         $alt_css = ($mth_num % 2 == 0) ? ' class="alt"' : '';
325         return '<th' . $alt_css . '>' . $month_names[$mth_num - 1] . '</th>';
379             $mth_num = ($mth - 1) % 12 + 1; // real month number (1-12)
382             if ($show_all_mths || in_array($mth_num, $opt['months'])) {
384                 $start = date('w', mktime(0, 0, 0, $mth_num, 1, (int)$year));
385                 $len = date('j', mktime(0, 0, 0, $mth_num + 1, 0, (int)$year));
388                 $years[$year][$mth_num] = ['start' => $start, 'len' => $len];