php mysql增量

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 获取上次同步时间
$last_sync_time = strtotime($_GET['last_sync_time']);

// 查询自上次同步以来发生变化的数据
$sql = "SELECT * FROM table_name WHERE updated_at > FROM_UNIXTIME($last_sync_time)";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 处理数据
    while($row = $result->fetch_assoc()) {
        // 更新客户端数据
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Updated at: " . $row["updated_at"]. "<br>";
    }
} else {
    echo "0 结果";
}
$conn->close();
?>