post内容を保持したまま更新したい。

<?phpini_set('display_errors', 0);


    if(isset($_POST['confirm'])){
        $confirm = $_POST['confirm'];
        $no = $_POST['no'];
        $where = $_POST['where'];



 
  try{
    $pdo = new PDO("mysql:host=localhost;dbname=〇〇;charset=utf8;","root","");
    if(count($where) > 0){
            $sql = "SELECT * FROM 〇 WHERE " . implode("AND", $where) . $line;
    }
    $stmt = $pdo->prepare($sql);
    $stmt ->execute();

    if($site == 1){
        $site = "1";
    }elseif($site == 2){
        $site = "2";
    }elseif($site == 3){
        $site = "3";
    }elseif($site == 4){
        $site = "4";
    }elseif($site == 5){
        $site = "5";
    }

?>


<p class="search">検索条件＝＞ ユーザーID:<?=$name?> /サイト名:<?=$site?> /誕生日: <?=$message?> /入力日時： <?=$nichi?><br><a href="./cms2.php">＜＜＜戻る</a></p>
<table border=1>
    <tr><th>no</th><th>ユーザー名</th><th>誕生日</th><th>入力日時</th><th>サイト名</th><th colspan="2">確認</th></tr>
   <tr>
<?php
     while($rec = $stmt->fetch(PDO::FETCH_ASSOC)){

          $no  = $rec['no'];
          $name = $rec['name'];
          $message = $rec['message'];
          $nichi = $rec['nichi'];
          $ji = $rec['ji'];
          $site = $rec['site'];
          $confirm = $rec['confirm'];

          if($confirm == 0){
              $confirm = "<span style='color:red'><u>未確認</u></span>";
          }elseif($confirm == 1){
              $confirm = "<u>確認中</u>";
          }elseif($confirm == 2){
              $confirm = "<span style='color:blue'><u>確認済み</u></span>";
          }

?>

    <td><?=$no?></td><td><?=$name?></td><td><?=$message?></td><td><?=$nichi?> <?=$ji?></td><td><a href="cms_site.php?site=<?=$site?>"><?=$site?></td>
    <td><?=$confirm?><br>まだここで変更しないでください<br>変更はメインページでお願いします</td>
    <td width="220"><form action="" method="POST">
            <input type="hidden" name="no" value="<?=$no?>">
            <select name="confirm">
                <option value="0">未確認</option>
                <option value="1">確認中</option>
                <option value="2">確認済み</option>
            </select>
            <input type="submit" value="変更">
        </form></td>
    </tr>

<?php

      }
?>
    </table>

    <a class="search" href="./〇〇.php">＜＜＜戻る</a>


<?php
} catch (Exception $e){
 exit('データベース接続失敗。' . $e ->getMessage());
}
?>