php – 如何为’select’框创建占位符,从mySQL中获取数据？

我正在尝试为我的drop-Box添加占位符,它从MysqL中获取结果,我不知道是否有办法.

<div class="select_drp">
    <?PHP
        $query = MysqL_query("SELECT * FROM training_list"); 
        echo '<select class="select_drp" name="insert_training" required>'; 
        while ($row = MysqL_fetch_array($query)) {
           echo '<option value="'.$row['id'].'">'.$row['training_type'].'</option>';
        }
        echo '</select>';
        echo "<br/><br/>";
    ?>
</div>

解决方法:

检查一下,我添加了< option value =“”>占位符< /选项>,我想你
可以使用它作为占位符.

<div class="select_drp">
    <?PHP
    $query = MysqL_query("SELECT * FROM training_list");
    echo '<select class="select_drp" name="insert_training" required>';
    echo '<option value="">Placeholder</option>';
    while ($row = MysqL_fetch_array($query)) {
        echo '<option value="' . $row['id'] . '">' . $row['training_type'] . '</option>';
    }
    echo '</select>';
    echo "<br/><br/>";
    ?>
</div>