避免在option标记中编写如此多的PHP代码.在数据库之前写入数据库获取代码并将其存储在数组中.
稍后,继续循环$array.
<?php
$dbc = mysqli_connect(DB_HOST,DB_USER,DB_PASSWORD,DB_NAME);
$query = "SELECT id FROM done_add";
$data = mysqli_query($dbc, $query);
$array=[];
while ($row = mysqli_fetch_array($data)) {
$array[] = $row['id'];
}
?>
<select name="selectlink">
<?php foreach ($array as $arr) { ?>
<option value = ""> <?php print($arr); ?></option>
<?php } ?>
</select>
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