<select class="input_select" name="xitong" id="xitong">
<?php
$dictsql="select id,mingcheng from dict_item where dictid=3 order by paixu asc,id asc";
$dictresult=$conn->query($dictsql);
if($dictresult->num_rows>0){
while($dictdata=$dictresult->fetch_assoc()){
?>
<option value="<?php echo $dictdata["id"]?>"><?php echo $dictdata["mingcheng"]?></option>
<?php
}
}
?>
</select>