如何在php中获取mysql的某个数据的id？

<?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, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 执行查询语句
$sql = "SELECT id FROM your_table WHERE condition";
$result = $conn->query($sql);

// 获取结果
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        $id = $row["id"];
        // 使用获取到的ID进行后续操作
        // ...
    }
} else {
    echo "没有找到符合条件的数据";
}

// 关闭数据库连接
$conn->close();
?>