Question

如何破坏块中的字符串值

include 'conn.php';
$query="SELECT defaultvalue FROM meta WHERE fieldid='grade' AND tableid='student'";
$result= mysqli_query($con,$query);

while($row=mysqli_fetch_array($result)){
    echo "<option value='".$row['defaultvalue']."'>";echo $row['defaultvalue']; echo "</option>";

}

它的节目如

I II III IV V VI VII VIII XI X

我想显示此字符串值Dropdown 像这样

<select>
    <option>I</option>
    <option>II</option>
    <option>III</option>
    <option>IV</option>
    <option>V</option>
    etc 
</select>

Answer 1

您缺少<select>标记。您的更新代码如下。

<?php 
   include 'conn.php';
    $query="SELECT defaultvalue FROM meta WHERE fieldid='grade' AND tableid='student'";
    $result= mysqli_query($con,$query);
    echo '<select>';
        while($row=mysqli_fetch_array($result))
        {

        echo "<option value='".$row['defaultvalue']."'>";echo $row['defaultvalue']; echo "</option>";

        }
     echo '</select>';
?>

Answer 2

 include 'conn.php';
        $query="SELECT defaultvalue FROM meta WHERE fieldid='grade' AND tableid='student'";
        $result= mysqli_query($con,$query);
        echo "<select>";
        while($row=mysqli_fetch_array($result))
        {

        echo "<option value='".$row['defaultvalue']."'>".$row['defaultvalue']."</option>";

        }
        echo "</select>;

Answer 3

您缺少选择标记。你应该在开始循环之前打开select标签

include 'conn.php';
    $query="SELECT defaultvalue FROM meta WHERE fieldid='grade' AND tableid='student'";
    $result= mysqli_query($con,$query);
    echo "<select>";
    while($row=mysqli_fetch_array($result)){
    echo "<option value='".$row['defaultvalue']."'>".$row['defaultvalue']."</option>";
    }
    echo "</select>";

如何在selectbox中拆分或分解字符串并显示值

3 个答案: