PHP 使用多个 while 循环仅检索 1 行

Question

目前，我的计划是在用户名旁边添加性别图标。问题是，即使表中有超过1条表记录，它也只显示1行，并且有些记录突然消失了。它是这样的:

我正在使用的代码:

$pdo = new PDO('connection');  
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$stmt1 = $pdo->prepare("SELECT id, user_id, user, bid, date
FROM auction_bids ORDER BY date DESC");  
$stmt2 = $pdo->prepare("SELECT user_id, user, bid, date
FROM auction_bids ORDER BY date DESC LIMIT 30");
$stmt11 = $pdo->prepare("SELECT pol FROM tb_users WHERE id = :user_id");

$stmt2->execute();
$r1 = $stmt1->fetch(PDO::FETCH_ASSOC);
$stmt11->execute(array(':user_id' => $r1['user_id']));

$id1 = $r1['id'];
echo '<table>';
while ($r1 = $stmt2->fetch(PDO::FETCH_ASSOC) && $r2 = $stmt11- >fetch(PDO::FETCH_ASSOC)) {
  echo '<tr>
        <td>' . $id1 . '</td>
        <td><img height="16" width="16" alt="gender icon" src
                ="../images/' . ($r2['pol'] == 1 ? 'male.png' : 'female.png') . '" />
        ' . $r1['user'] . '</td>
        <td class="border-right">' . $r10['level'] . '</td>
        <td>' . $r1['bid'] . ' FA</td>
        <td><img height="16" width="16" alt="calendar" src
                ="../images/calendar.png" />
            ' . date($dateFormatBids, strtotime($r1['date'])) . '</td>
        </tr>
  ';
  $id1--;
}
echo '<table>

使用 while ($r1 = $stmt2->fetch(PDO::FETCH_ASSOC)) {..} 循环而不使用 $r2，它正在工作(除了性别颜色相同，对于测试，它应该是红色，对于卢卡斯，应该是蓝色):

如果有什么需要，请说。我对 PHP 和 PDO 还很陌生。

Answer 1

从行: $stmt11->execute(array(':user_id' => $r1['user_id'])); 您将获得一条记录，因此 while 循环打印一条记录行。

编写如下查询:

$stmt2 = $pdo->prepare("SELECT tu.pol, user_id, user, bid, date 
FROM auction_bids ab left join tb_users tu on ab.user_id = tu.id
ORDER BY date DESC LIMIT 30");

现在:

while ($r1 = $stmt2->fetch(PDO::FETCH_ASSOC){
    //rest of the code should work... user $r1['pol'] instead of $r2
}