dedecms被挂黑链接

<?php
// 连接数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "dedecms";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 查询所有文章
$sql = "SELECT id, content FROM dede_archives";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        $content = $row["content"];
        // 使用正则表达式检测黑链接
        if (preg_match('/<a[^>]*href=[\'"]?([^>\'"\s]+)[\'"]?[^>]*>黑链接<\/a>/i', $content)) {
            // 删除黑链接
            $new_content = preg_replace('/<a[^>]*href=[\'"]?([^>\'"\s]+)[\'"]?[^>]*>黑链接<\/a>/i', '', $content);
            // 更新文章内容
            $update_sql = "UPDATE dede_archives SET content='$new_content' WHERE id={$row["id"]}";
            $conn->query($update_sql);
        }
    }
} else {
    echo "0 结果";
}
$conn->close();
?>