从数据库中删除记录并将其保存到文件中- PHP

<?php
$servername = "数据库服务器地址";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("数据库连接失败: " . $conn->connect_error);
}
?>

<?php
$sql = "DELETE FROM users WHERE id = 1";

if ($conn->query($sql) === TRUE) {
    echo "记录删除成功";
} else {
    echo "记录删除失败: " . $conn->error;
}
?>

<?php
// 查询已删除的记录
$sql = "SELECT * FROM users WHERE id = 1";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 打开文件
    $file = fopen("deleted_records.csv", "w");

    // 写入表头
    $header = array("ID", "姓名", "邮箱");
    fputcsv($file, $header);

    // 写入记录
    while ($row = $result->fetch_assoc()) {
        $data = array($row["id"], $row["name"], $row["email"]);
        fputcsv($file, $data);
    }

    // 关闭文件
    fclose($file);

    echo "已删除的记录保存到文件中";
} else {
    echo "未找到已删除的记录";
}
?>