PHP设置多选下拉列表

Question

我从我的数据库中提取数据以检索为多选下拉列表选择的多个选项。我是他们试图重置这些值作为选择，但其中唯一选定的一个。

我从数据库阵列：

[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HTML/PHP我使用生成的选项，并尝试重新选择阵列中的选项：

<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

你在内部循环中覆盖$isSel，所以你只有每个人都能得到最后一次迭代的值。

而是初始化内环以外的变量：你有一些语法的怪事在这一行`<期权价值=发生

<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>