如何在表单中保持PHP下拉选择的刷新？

<select name="fruit">
  <option value="apple">Apple</option>
  <option value="banana">Banana</option>
  <option value="orange">Orange</option>
</select>

$selectedFruit = $_POST['fruit'];

<select name="fruit">
  <option value="apple" <?php if($selectedFruit == 'apple') echo 'selected'; ?>>Apple</option>
  <option value="banana" <?php if($selectedFruit == 'banana') echo 'selected'; ?>>Banana</option>
  <option value="orange" <?php if($selectedFruit == 'orange') echo 'selected'; ?>>Orange</option>
</select>