用php怎么更新mysql数据库

<?php
// 连接到MySQL数据库
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 准备更新语句
$sql = "UPDATE your_table SET column1 = ?, column2 = ? WHERE id = ?";
$stmt = $conn->prepare($sql);

// 绑定参数
$column1_value = "new_value1";
$column2_value = "new_value2";
$id = 1;
$stmt->bind_param("ssi", $column1_value, $column2_value, $id);

// 执行更新
$stmt->execute();

// 检查更新结果
if ($stmt->affected_rows > 0) {
    echo "更新成功";
} else {
    echo "更新失败";
}

// 关闭连接
$stmt->close();
$conn->close();
?>