PHP设置多选择下拉列表

Question

我正在从我的数据库中提取数据，以检索为多选择下拉列表选择的多个选项。我尝试将这些值重置为已选择的值，但它仅选择其中之一。

数据库中的数组：

[data] => SimpleXMLElement Object
        (
            [term] => LTA
            [prevention] => SimpleXMLElement Object
                (
                    [reason] => Array
                        (
                            [0] => SimpleXMLElement Object
                                (
                                    [process] => Recruitment
                                    [processID] => 4
                                )

                            [1] => SimpleXMLElement Object
                                (
                                    [process] => People Management
                                    [processID] => 3
                                )

                            [2] => SimpleXMLElement Object
                                (
                                    [process] => Not Applicable
                                    [processID] => 2
                                )

                        )
                )

        )

下面是我用来生成选项并尝试重新选择数组中的选项的HTML / PHP：

<select name="prevention" id="prevention" class="form-control dd ff" placeholder="Select 1 or more options" multiple="multiple">
<?php foreach($processes->data as $process){ 
   foreach($recordDetails->data->prevention->reason as $is){
    if((int)$is->processID == (int)$process->processID){
        $isSel = 'selected';    
    }
    else
    {
        $isSel = '';    
    }
   }
   ?>
<option value="<?php echo $process->processID . '" '. $isSel . '>'; ?> <?php echo $process->process; ?></option>
<?php } ?>
</select>

Answer 1

您在内部循环中重写$isSel，因此您只获得最后一次迭代的值。

相反，在内部循环之外初始化变量：

<select name="prevention" id="prevention" class="form-control dd ff" placeholder="Select 1 or more options" multiple="multiple">
<?php 
    foreach($processes->data as $process):
        $isSel = '';
        foreach($recordDetails->data->prevention->reason as $is):
            if((int)$is->processID == (int)$process->processID){
                $isSel = 'selected';
                break;
            }
        endforeach;
        ?>
        <option value="<?php echo $process->processID . '" '. $isSel . '>'; ?> <?php echo $process->process; ?></option>
    <?php 
    endforeach; ?>
</select>