如何在<select>元素中保存数据

Question

For multiple steps form I preserve entered value in <input> elements with this code:

<input name="city" type="text" value="<?php echo isset($_POST['city']) ? $_POST['city'] : '' ?>"/>

but I don't know how to implement it for <select> elements in order to preserve selected option.

Answer 1

Add "selected" to the desired option:

<select>
  <option value="a" <?php echo ($_POST['select'] == 'a') ? 'selected' : ''; ?>>a</option>;
  <option value="b" <?php echo ($_POST['select'] == 'b') ? 'selected' : '' ?>>b</option>
  <option value="c" <?php echo ($_POST['select'] == 'c') ? 'selected' : ''; ?>>c</option>
</select>

Or, if you create your select with a loop, do it once for every options:

<?php $list = array('a', 'b', 'c'); ?>

<select>
<?php foreach($list as $value): ?>
   <option value="<?php echo $value; ?>" <?php echo ($_POST['select'] == $value) ? 'selected' : ''; ?>><?php echo $value; ?></option>
<?php endforeach; ?>
</select>