dedecms留言板调用

<!-- 留言板调用代码 -->
<div class="guestbook">
    <h2>留言板</h2>
    <div id="guestbook-content">
        {dede:php}
        $sql = "SELECT * FROM `dede_guestbook` ORDER BY `id` DESC LIMIT 10";
        $dsql->SetQuery($sql);
        $dsql->Execute();
        while($row = $dsql->GetArray()){
            echo "<div class='guestbook-item'>";
            echo "<p><strong>昵称：</strong>{$row['username']}</p>";
            echo "<p><strong>时间：</strong>" . date("Y-m-d H:i:s", $row['time']) . "</p>";
            echo "<p><strong>内容：</strong>{$row['content']}</p>";
            echo "</div>";
        }
        {/dede:php}
    </div>
    <form action="plus/guestbook.php" method="post">
        <input type="hidden" name="action" value="submit">
        <div>
            <label for="username">昵称：</label>
            <input type="text" id="username" name="username" required>
        </div>
        <div>
            <label for="content">内容：</label>
            <textarea id="content" name="content" required></textarea>
        </div>
        <button type="submit">提交</button>
    </form>
</div>