[php] db 에서 조회한 날짜중 가장 최근날짜 selected

<?
    // 가장 최근의 reg_date 가져오기
    $sql01 = "SELECT reg_date FROM homepage_page_content WHERE using_bit=1 AND folder_page_no='300' ORDER BY reg_date DESC LIMIT 1";
    $result01 = mysql_query($sql01);
    $arr01=sql_fetch_array($result01);
    $regDate=$arr01[reg_date];
    // reg_date에서 연도 부분만 추출
    $year = substr($regDate, 0, 4);
    $month = substr($regDate, 5, 2);
 ?>

<div class="month-picker">
  <select name="year" id="year">
    <option value="2024" <?= $year == '2024' ? 'selected' : '' ?>>2024</option>
    <option value="2025" <?= $year == '2025' ? 'selected' : '' ?>>2025</option>
    <option value="2026" <?= $year == '2026' ? 'selected' : '' ?>>2026</option>
    <option value="2027" <?= $year == '2027' ? 'selected' : '' ?>>2027</option>
  </select>
   <?php for ($i = 1; $i <= 12; $i++): ?>
    <a href="#" class="is <?= $i == (int)$month ? 'on' : '' ?>"><?= $i ?></a>
  <?php endfor; ?>
  <div class="picker">
    <div class="month"></div>
  </div>
</div>