如何从数据库行中获取最高值 - How to get the highest value from a database row?

我有个问题。我有一个一页的网站，如果发布了一条消息，帖子就会出现在帖子下面，需要有一张图片，但在索引页面的最后一页，我不希望出现图片。所以这就像是如果数据库中的id是最高的，那么帖子就不会在它下面得到图像

这是代码：

<?php
include 'functions/image/functions.php';
$countQuery = $db->prepare("SELECT paginaNummer AS max FROM pages ;");
$countRow = $countQuery->fetch();
$maxId = $countRow['max'];
$query = $db->prepare("SELECT * FROM pages");
$query->execute();
$num_cols = 1;
$i = 0;
$imgList = getImagesFromDir($root . $path);
$img = getRandomFromArray($imgList);

while($row = $query->fetch()) {
    if(isset($row)) {
        echo "<section data-stellar-background-ratio='0.5'>";
        echo "<div class='panelContainer'>";
        echo "<div class='panel2'>";
        echo "<div class='symbol3'></div>";
        echo "</div>";
        echo "</div>";
        echo "</div>";
        echo "</section>";
        echo "<section class='wrapper'>";
        echo "<div class='box'>";
        echo "<div class='content'>";
        echo $i++ % $num_cols == 0 ? '' : '';
        echo "<div id='message'><h2>&nbsp;&nbsp;", $row['berichtNaam'], "</h2>";
        echo $row['paginaContent'], "<br />";
        if (isset($_SESSION['login']['5']) && $_SESSION['login']['5'] == 2) {
            echo "&nbsp;<a class='edit' href='functions/admin/edit.php?id=" . $pageNumber . " '>Edit</a>";
            echo "&nbsp;<a class='delete' href='functions/admin/deletePost.php?id=" . $pageNumber . " '>Delete</a>";
        } elseif (isset($_SESSION['login']['5']) && $_SESSION['login']['5'] == 1) {
            echo "&nbsp;<a class='edit' href='functions/admin/edit.php?id=" . $pageNumber . " '>Edit</a>";
        } else {
        }
        echo "</div>";
        echo "</div>";
        echo "</section>";
        echo max($row);
        if (count($row['paginaNummer']) == max($row)){
        } else {
            echo "<a href='/'><img src='<?php echo $path . $img ?>'alt=''/></a>";
        }
        echo "</section>";
    }
}
echo "</div></div>";
?>

我不会对这个部分有任何进一步的了解，我希望你能帮助我解决这个问题

很难理解您需要什么。但试试这个查询：

$countQuery = $db->prepare("SELECT paginaNummer AS max 
                            FROM pages ORDER BY paginaNummer DESC LIMIT 1");

或者可能是这样的：

$countQuery = $db->prepare("SELECT paginaNummer AS max 
                            FROM pages ORDER BY id DESC LIMIT 1");

更新：此代码更改而不是顶部：

<?php
include 'functions/image/functions.php';
$query = $db->prepare("SELECT * FROM pages");
$query->execute();
$maxrow = $query->rowCount();
$num_cols = 1;
$i = 0;
$imgList = getImagesFromDir($root . $path);
$img = getRandomFromArray($imgList);
$n = 0;
while($row = $query->fetch()) {
    if(isset($row)) {
       $n++;
        echo "<section data-stellar-background-ratio='0.5'>";
        echo "<div class='panelContainer'>";
        echo "<div class='panel2'>";
        echo "<div class='symbol3'></div>";
        echo "</div>";
        echo "</div>";
        echo "</div>";
        echo "</section>";
        echo "<section class='wrapper'>";
        echo "<div class='box'>";
        echo "<div class='content'>";
        echo $i++ % $num_cols == 0 ? '' : '';
        echo "<div id='message'><h2>&nbsp;&nbsp;", $row['berichtNaam'], "</h2>";
        echo $row['paginaContent'], "<br />";
        if (isset($_SESSION['login']['5']) && $_SESSION['login']['5'] == 2) {
            echo "&nbsp;<a class='edit' href='functions/admin/edit.php?id=" . $pageNumber . " '>Edit</a>";
           echo "&nbsp;<a class='delete' href='functions/admin/deletePost.php?id=" . $pageNumber . " '>Delete</a>";
        } elseif (isset($_SESSION['login']['5']) && $_SESSION['login']['5'] == 1) {
            echo "&nbsp;<a class='edit' href='functions/admin/edit.php?id=" . $pageNumber . " '>Edit</a>";
        } else {
        }
        echo "</div>";
        echo "</div>";
        echo "</section>";
        echo max($row);
        if ($n == $maxrow){
        } else {
            echo "<a href='/'><img src='<?php echo $path . $img ?>'alt=''/></a>";
        }
        echo "</section>";
    }
}
echo "</div></div>";
?>