php如何获取mysql表中的最后一行

// 连接数据库
$conn = new mysqli("localhost", "username", "password", "database");
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 获取最后一行
$result = $conn->query("SELECT * FROM table ORDER BY id DESC LIMIT 1");
if ($result->num_rows > 0) {
    $row = $result->fetch_assoc();
    echo "最后一行数据：";
    print_r($row);
} else {
    echo "表中没有数据。";
}

// 连接数据库
$conn = new mysqli("localhost", "username", "password", "database");
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 使用 max() 函数获取 id 的最大值
$result = $conn->query("SELECT MAX(id) AS max_id FROM table");
$row = $result->fetch_assoc();
$max_id = $row['max_id'];

// 获取具有最大 id 的行
$result = $conn->query("SELECT * FROM table WHERE id = $max_id");
if ($result->num_rows > 0) {
    $row = $result->fetch_assoc();
    echo "最后一行数据：";
    print_r($row);
} else {
    echo "表中没有数据。";
}