php - 根据mysql字段设置选择的选项

Question

我有一个 HTML 表单，用户可以使用它来编辑 mysql 数据库中的一行，PHP 脚本查询数据库，然后在表单中显示当前数据。我有这样的文本字段工作正常:

Correct Answer:<input type="text" name="answer" value="<?php echo $row['CorrectAnswer']; ?>"><br>

简单的 radio 设置如下:

<?php 
            if ($row['Hazardous'] == "no"){
        ?>      
        Hazardous?:<input type="radio" name="hazardous" value="yes">Yes 
            <input type="radio" name="hazardous" value="no" checked="checked">No<br>
        <?php
            }else{
        ?>
        Hazardous?:<input type="radio" name="hazardous" value="yes" checked="checked">Yes   
            <input type="radio" name="hazardous" value="no" >No<br>
        <?php } ?>

我还有一个如下所示的选择选项元素:

Category: <select name="category">
                <option value="hazardawareness">Hazard Awareness</option>
                    <option value="observation">Observation</option>
                    <option value="insurance">Insurance</option>
                    <option value="attitude">Attitude</option>
                    <option value="knowledge">Gen. Knowledge</option>
            </select><br>

我正在尝试设置，我可以使用:

<?php if ($row['Category'] == "hazardawareness"){ ?>        
    Category: <select name="category">
                <option value="hazardawareness" selected="selected">Hazard Awareness</option>
                    <option value="observation">Observation</option>
                    <option value="insurance">Insurance</option>
                    <option value="attitude">Attitude</option>
                    <option value="knowledge">Gen. Knowledge</option>
            </select><br>   
<?php }else if ($row['Category'] == "observation"){ ?>
Category: <select name="category">
                <option value="hazardawareness">Hazard Awareness</option>
                    <option value="observation" selected="selected">Observation</option>
                    <option value="insurance">Insurance</option>
                    <option value="attitude">Attitude</option>
                    <option value="knowledge">Gen. Knowledge</option>
            </select><br>   
<?php }else if ($row['Category'] == "insurance"){ ?>
Category: <select name="category">
                <option value="hazardawareness">Hazard Awareness</option>
                    <option value="observation">Observation</option>
                    <option value="insurance"selected="selected">Insurance</option>
                    <option value="attitude">Attitude</option>
                    <option value="knowledge">Gen. Knowledge</option>
            </select><br>   
<?php }else if ($row['Category'] == "attitude"){ ?>
Category: <select name="category">
                <option value="hazardawareness">Hazard Awareness</option>
                    <option value="observation">Observation</option>
                    <option value="insurance">Insurance</option>
                    <option value="attitude" selected="selected">Attitude</option>
                    <option value="knowledge">Gen. Knowledge</option>
            </select><br>   
<?php }else if ($row['Category'] == "knowledge"){ ?>
Category: <select name="category">
                <option value="hazardawareness" >Hazard Awareness</option>
                    <option value="observation">Observation</option>
                    <option value="insurance">Insurance</option>
                    <option value="attitude">Attitude</option>
                    <option value="knowledge" selected="selected">Gen. Knowledge</option>
            </select><br>   
<?php } ?>

但也许有更好的方法可以做到这一点而无需重复那么多代码？

Answer 1

如果需要，您可以在 option 创建的 selected 属性中添加一个 if 子句。

<?php $options = array( 
                 "Hazard Awareness" => hazardawareness, 
                 "Observation" => observation,
                 "Insurance" => insurance, 
                 "Attitude" => attitude 
              );  ?>
<select name="category">
<?php  foreach($options as $display => $value) {  ?>
    <option value='<?= $value ?>' <?php if($row['Category'] == trim($value)) { ?>selected='selected'<?php } ?>>
        <?= $display ?>
    </option>
<?php } ?>
</select>