无法从serializeArray获取php mysql更新

var formData = $('#your-form-id').serializeArray();

var jsonString = JSON.stringify(formData);

$.ajax({
    url: 'your-php-file.php',
    type: 'POST',
    data: {formData: jsonString},
    success: function(response) {
        console.log(response);
    },
    error: function(error) {
        console.log(error);
    }
});

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

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

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// 解析JSON字符串
$jsonData = file_get_contents('php://input');
$data = json_decode($jsonData, true);

// 遍历数据并更新MySQL数据库
foreach ($data as $row) {
    $key = $row['name'];
    $value = $row['value'];

    // 构建更新语句
    $sql = "UPDATE your_table SET $key = '$value' WHERE your_condition";

    // 执行更新语句
    if ($conn->query($sql) === TRUE) {
        echo "Record updated successfully";
    } else {
        echo "Error updating record: " . $conn->error;
    }
}

// 关闭数据库连接
$conn->close();
?>