php怎么向mysql数据库添加数据

$servername = "localhost";
$username = "root";
$password = "password";
$dbname = "mydb";

// 创建 MySQLi 连接
$conn = new <a style="color:#f60; text-decoration:underline;" href="https://www.php.cn/zt/15713.html" target="_blank">mysql</a>i($servername, $username, $password, $dbname);