<?php
$host="localhost";
$db_user = "root";
$db_password ="";
$db_name = "baza1";
$db = mysqli_connect($host, $db_user, $db_password, $db_name) or die('nie polaczylem sie');

if(isset($_POST['submit'])){
   mysqli_query($db,"insert into gra (cena, nazwa, dane_gry) values   ({$_POST['cena']},{$_POST['nazwa']},{$_POST['dane_gry']})");

}
?>