dedecms后台广告位更换图片

<?php
// 假设这是Dedecms后台广告位编辑页面的PHP代码
if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_POST['save'])) {
    $ad_id = $_POST['ad_id'];
    $image_path = $_FILES['image']['tmp_name'];
    $image_name = $_FILES['image']['name'];

    // 检查图片文件是否存在
    if (file_exists($image_path)) {
        // 移动上传的图片到广告位目录
        $upload_dir = './uploads/ad_images/';
        if (!file_exists($upload_dir)) {
            mkdir($upload_dir, 0755, true);
        }
        $dest_path = $upload_dir . $image_name;
        if (move_uploaded_file($image_path, $dest_path)) {
            // 更新数据库中的广告位图片路径
            $db = new PDO('mysql:host=localhost;dbname=dedecms', 'username', 'password');
            $stmt = $db->prepare("UPDATE `dede_ad` SET `ad_code` = :ad_code WHERE `id` = :ad_id");
            $ad_code = '<img src="' . $dest_path . '" alt="广告图片">';
            $stmt->bindParam(':ad_code', $ad_code);
            $stmt->bindParam(':ad_id', $ad_id);
            $stmt->execute();
            echo "广告位图片更换成功！";
        } else {
            echo "图片上传失败，请检查服务器配置和文件权限。";
        }
    } else {
        echo "上传的图片文件不存在。";
    }
}
?>

<!-- HTML表单 -->
<form method="post" enctype="multipart/form-data">
    <input type="hidden" name="ad_id" value="1">
    <label for="image">上传图片：</label>
    <input type="file" name="image" id="image">
    <button type="submit" name="save">保存</button>
</form>