它应该是
while ($row = $query->fetch(PDO::FETCH_ASSOC)) { $id = $row['id']; $n = $row['n']; $k = $row['k'];}如果你坚持的
fetchAll话
$results = $query->fetchAll(PDO::FETCH_ASSOC);foreach($results as $row) { $id = $row['id']; $n = $row['n']; $k = $row['k'];}PDO::FETCH_ASSOC仅获取列名，并省略数字索引。
