PHP Mysql while循环为带限制的空行设置默认数组值

我有两组横幅广告和两组横幅广告。数据库是这样的

Array
(
    [1] => Array
        (
            [1] => Array
                (
                    [type] => 2
                    [url] => https://example.com/banner.png
                    [count] => 1
                )

            [2] => Array
                (
                    [type] => 2
                    [url] => https://example.com/images.png
                    [count] => 2
                )

            [3] => Array
                (
                    [type] => default
                    [count] => 3
                )

        )

    [2] => Array
        (
        )

)

团体广告

横幅广告

此代码用于显示基于其组的所有横幅广告

$res_arr = array();
$stmt = $conn->prepare("SELECT * FROM groups_ads");
$stmt->execute();
$stmt->setFetchMode(PDO::FETCH_ASSOC);
while ($res = $stmt->fetch())
{
    $result = array();
    $max_slot = $res['max_places'];
    $count = 0;
    $banners = array();
    $stmts = $conn->prepare('
        SELECT * FROM banner_ads
        WHERE group_id = "'.$res['id'].'"
    ');
    $stmts->execute();
    $stmts->setFetchMode(PDO::FETCH_ASSOC);
    while ($count < $max_slot && $banner = $stmts->fetch()){
        $count++;
        if($banner){
        $banners = array(
            "type" => 2,
            "url" => $banner['url_images'],
            "count" => $count
        );
        }else{
            $banners = array(
                "type" => "default",
                "count" => $count
            );
        }
    $result[$count] = $banners;
    }
    $res_arr[$res['id']] = $result;
}

因为我的数据库中有两个横幅广告，在第一组

问题是，如何根据最大位置填充空行？ 在数据库组中，组1的最大位置为3。但在数据库中，横幅广告只有两个横幅。那么，我如何将空的位置填充到默认字符串中呢？所以结果是这样的

Array
(
    [1] => Array
        (
            [1] => Array
                (
                    [type] => 2
                    [url] => https://example.com/banner.png
                    [count] => 1
                )

            [2] => Array
                (
                    [type] => 2
                    [url] => https://example.com/images.png
                    [count] => 2
                )

            [3] => Array
                (
                    [type] => default
                    [count] => 3
                )

        )

    [2] => Array
        (
        )

)

---

感谢您的帮助。

如果在while循环条件中删除$banner上的测试，您将确保始终为每个数组填充$max\u slots值。替换：

while ($count < $max_slot && $banner = $stmts->fetch()){
    $count++;
    if($banner){

与

Array
(
    [1] => Array
        (
            [1] => Array
                (
                    [type] => 2
                    [url] => https://example.com/banner.png
                    [count] => 1
                )

            [2] => Array
                (
                    [type] => 2
                    [url] => https://example.com/images.png
                    [count] => 2
                )

            [3] => Array
                (
                    [type] => default
                    [count] => 3
                )

        )

    [2] => Array
        (
        )

)

while ($count < $max_slot && $banner = $stmts->fetch()){
    $count++;
    if($banner){

while ($count < $max_slot) {
    $count++;
    if ($banner = $stmts->fetch()) {