Php 无法使用另一个while循环中的while循环

While循环在另一个While循环中不起作用。 解析错误：语法错误，while{之后出现意外的“.”

$sql=“从问题中选择*，其中问题\u id={$update\u id}”；
$result=mysqli_查询（$conn，$sql）或die（“查询失败”）；
$output=''；
如果（mysqli_num_行（$result）>0）{
while（$question=mysqli\u fetch\u assoc（$result））{
$output.=”
教员：
".
$sql2='从教员中选择教员id、教员名称；'；
$result2=mysqli_查询（$conn，$sql2）或die（'query failed'）；
if（mysqli_num_行（$result2））{
而（$faculty=mysqli\u fetch\u assoc（$result2））{
“{$faculty['faculty_name']}
".
}
}
."
";

试试这个修订版：

$select = "";
$sql2 = 'SELECT faculty_id,faculty_name FROM faculty;';
         $result2 = mysqli_query($conn, $sql2);
         if(mysqli_num_rows($result2)){
              while($faculty = mysqli_fetch_assoc($result2)){
                   $select.= "<option value='{$faculty['faculty_id']}'";
                   $select.=  $question['faculty']==$faculty['faculty_id'] ? 'selected':'';
                   $select.= ">{$faculty['faculty_name']}</option>";"
              }
         }

$output = <<<EOT
    <div class='form-panel'>
         <label for='question-faculty'>Faculty:</label>
         <select name='faculty' id='question-faculty'>
         $select
         </select>
    </div>
EOT;

$select=”“；
$sql2='从教员中选择教员id、教员名称；'；
$result2=mysqli_查询（$conn，$sql2）；
if（mysqli_num_行（$result2））{
而（$faculty=mysqli\u fetch\u assoc（$result2））{
$select.=“{$faculty['faculty\u name']}”
}
}
$output=这不是php代码这是什么？这应该做什么？我很抱歉只发布了部分代码并请求帮助。上面的while循环位于另一个while循环中，而while循环似乎不起作用。
$select = "";
$sql2 = 'SELECT faculty_id,faculty_name FROM faculty;';
         $result2 = mysqli_query($conn, $sql2);
         if(mysqli_num_rows($result2)){
              while($faculty = mysqli_fetch_assoc($result2)){
                   $select.= "<option value='{$faculty['faculty_id']}'";
                   $select.=  $question['faculty']==$faculty['faculty_id'] ? 'selected':'';
                   $select.= ">{$faculty['faculty_name']}</option>";"
              }
         }

$output = <<<EOT
    <div class='form-panel'>
         <label for='question-faculty'>Faculty:</label>
         <select name='faculty' id='question-faculty'>
         $select
         </select>
    </div>
EOT;