如何在PHP中从1开始生成序列号并将其插入到表中？

<?php
// 连接数据库
$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("连接数据库失败: " . $conn->connect_error);
}

// 查询当前最大的序列号
$sql = "SELECT MAX(serial_number) AS max_serial FROM your_table";
$result = $conn->query($sql);
$max_serial = $result->fetch_assoc()["max_serial"];

// 生成新的序列号
$new_serial = $max_serial + 1;

// 插入新的序列号到表中
$sql = "INSERT INTO your_table (serial_number) VALUES ($new_serial)";
if ($conn->query($sql) === TRUE) {
    echo "序列号插入成功";
} else {
    echo "插入序列号时出错: " . $conn->error;
}

$conn->close();
?>