查询提取问题

Question

以下代码旨在显示成员总数，但不会显示任何内容

<?php
            $query = $forumdb->prepare("SELECT totalMembers FROM smf_settings");
            $query->execute();
            $num_rows = $query->fetch();
            ?>
            <div class="media-body">
            <p id="greet" align="left">Total Members: <?php echo .$num_rows['totalMembers']. ?> <p>
            </div>

Answer 1

要计算您可以使用的成员总数count

$query->execute();
$rows = $query->fetch();
$num_rows = count($rows);

或者将您的查询更改为count并使用fetchColumn

$query = $forumdb->prepare("SELECT COUNT(totalMembers) FROM smf_settings");
$query->execute();
/* Check the number of rows that match the SELECT statement */
$num_rows=$res->fetchColumn();