要选择多个选择，请从动态数据查询中选择多个标记

Question

我正在使用bootstrap 3，我有一个双面多选框。一侧应显示第二侧不存在的所有行，反之亦然。我正在使用php mysql。

<select  name="job_rights[]" multiple="multiple" id="msc">
    <?php
    foreach ($all_active_locations as $value) {
      //$selected = in_array ($value["location_id"],$user_location_rights_selected["selected_loc_id"]) ? ' selected="selected" ' : ''; 

      echo '<option value="' . $value["location_id"] . '" selected( true, in_array($value["location_id"], $user_location_rights_selected["selected_loc_id"]) );>'
        . $value["location_id"] .'/'. $value["location_name"] .  '</option>';
    }
    ?>
</select>