如何使用php从json向mysql插入与我的数组中一样多的项

$data = json_decode($json, true);

$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";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

foreach ($data as $item) {
    $column1 = $item['column1']; // 假设数组中的每个项都有column1和column2字段
    $column2 = $item['column2'];

    $sql = "INSERT INTO 表名 (column1, column2) VALUES ('$column1', '$column2')";
    if ($conn->query($sql) === true) {
        echo "插入成功";
    } else {
        echo "插入失败: " . $conn->error;
    }
}

$conn->close();