php - 查询输出未显示在页面上

Question

我有以下不显示任何内容/工作的查询/输出。所有的列表名称都是正确的。我有 php 错误检查，它没有抛出任何错误。

这是没有输出任何内容的代码。

$total_members_query = $con->prepare("SELECT COUNT(id)FROM users WHERE `group` IN (2,3,4,5)")
    or die ("Total Members query failed: %s\n".($total_members_query->error));
    $total_members_query->execute();
    $total_members_query->bind_result($total_members);
    $numrows_members = $total_members_query->num_rows();
//  $numrows_members = mysqli_num_rows($total_members_query);
    if($numrows_members > 0){

    while($members_row = mysqli_fetch_assoc($total_members_query)){
        //$members_total = $members_row['id'];
?>
                            <div class="member_summary_statistics">
                                <div class="member_summary_category_title">League Statistics</div>
        <div id="member_summary_member_count">Members in your league: <?php echo $total_members; } } ?></div>

这里有更多代码。略高于和低于它。

<div class="member_summary_user_birthdays">
                            <div class="member_summary_category_title">Today&#39;s Birthdays</div>
                        </div>
<?php
$total_members_query = $con->prepare("SELECT COUNT(id)FROM users WHERE `group` IN (2,3,4,5)")
        or die ("Total Members query failed: %s\n".($total_members_query->error));
        $total_members_query->execute();
        $total_members_query->bind_result($total_members);
        $numrows_members = $total_members_query->num_rows();
    //  $numrows_members = mysqli_num_rows($total_members_query);
        if($numrows_members > 0){

        while($members_row = mysqli_fetch_assoc($total_members_query)){
            //$members_total = $members_row['id'];
?>
                            <div class="member_summary_statistics">
                                <div class="member_summary_category_title">League Statistics</div>
        <div id="member_summary_member_count">Members in your league: <?php echo $total_members; } } ?></div>
                                    <div id="member_summary_newest_member">Welcome our newest member - <?php echo $member_username;?>!</div>

& 符号之后的这一行中的所有内容在我的文件管理器中都显示为灰色，而不是黑色和蓝色。

Today&#39;s Birthdays</div>

然后我的两个标题没有出现在生日文本之后..

class="member_summary_category_title">League Statistics</div>
        <div id="member_summary_member_count">Members in your league: 

我不知道这是否与正在发生的事情有关，因为我已经一遍又一遍地查看它，但无法弄清楚任何事情。

如果有任何帮助，我将不胜感激。

Answer 1

看起来您在 prepare 语句中的 COUNT(id) 和 FROM 之间缺少一个空格。

编辑: 您还需要缓冲结果集，请参阅 Mysqli documentation :

$total_members_query->execute();
$total_members_query->bind_result($total_members);
$total_members_query->store_result();
$numrows_members = $total_members_query->num_rows;

编辑 2: 仔细查看您的陈述，我意识到您的查询将始终返回一行(因为 COUNT 至少为 0)，为什么您可能想要采用这样的方法:

<?php
$total_members_query = $con->prepare("SELECT COUNT(id) as countId FROM users WHERE `group` IN (2,3,4,5)")
    or die ("Total Members query failed: \n" . ($total_members_query->error));
    $total_members_query->execute();
    $total_members_query->bind_result($total_members);
    $total_members_query->fetch();
    if($total_members > 0){
    ?>
    HTML-code...