Question

所以我有这个PHP代码：

注意：我确实使用了mysqli_connect（）。

$result = mysqli_query($con,"SELECT * FROM `smf_messages` WHERE `id_board` = 18");
if(!$result) {
    echo "<center><p>Couldn't fetch news posts. Error code 2.</p></center>";
    mysqli_close($con);
} else {
    $posts = array();
    $topicbdy = array();
    while($row = mysqli_fetch_array($result,MYSQLI_ASSOC))
    {
        $posts[$row['id_topic']] = $row['id_topic'];
        $topicbdy[$row['id_msg']] = $row['id_msg'];
    }
    $display = max($posts);
    $display2 = min($topicbdy);
    $qry = "SELECT * FROM `smf_messages` WHERE `id_board` = 18 AND `id_topic` = " . $display . " AND `id_msg` = " . $display2;
    $result2 = mysqli_query($con,$qry);
    //echo $qry;
    if(!$result2) {
        echo "<center><p>Couldn't fetch news posts. Error code 3.</p></center>";
    } else {
        while($show = mysqli_fetch_array($result,MYSQLI_ASSOC))
        {
            echo "<center><h1>" . $show['subject'] . "</h1></center><br /><br />";
            echo "<center>" . $show['body'] . "</center><br />";
        }
    }
    mysqli_free_result($result);
    mysqli_free_result($result2);
    mysqli_close($con);

它应该从新闻板获取最新的主题，从我的基于SMF的论坛获取最新主题，获得最高的主题ID，但是最低的帖子ID。它似乎做了很好的查询，因为我没有得到任何错误，但它没有显示主题或正文。我该怎么办？

Answer 1

您的$result变量对于第二次查询获取是错误的。对于您的第二个查询

 while($show = mysqli_fetch_array($result,MYSQLI_ASSOC))

应该是

 while($show = mysqli_fetch_array($result2,MYSQLI_ASSOC))
                                         ^

PHP - 不回显MySQL数据库中的数据，但没有错误？

1 个答案: