Need MySQL db for php script - php

Question

I want to make a shop for my website, so I need MySQL.
I want to take 50 Golds from the user, and give 5 atkdmg.
My current script looks like this:
<?php
ob_start();
session_start();
print('<meta http-equiv="content-type" content="text/html; charset=UTF-8"
/>');
include('config.php');
if(isset($_SESSION['rank']) && $_SESSION['rank'] >= 1)
{
if(isset($_SESSION['Gold']) && $_SESSION['Gold'] >= 50)
{
mysql_query("UPDATE users SET Gold = $_SESSION[Gold]-50 WHERE id =
$_SESSION[id];");
mysql_query("UPDATE users SET AtkDmg = $_SESSION[AtkDmg] + 5' WHERE id =
$_SESSION[id];");
} else header('location: shop.php');
} else header('location: login.php');
mysql_close()
?>
What is session? here it is:
<?php
ob_start();
session_start();
include('config.php');
include('login_form.php');
if(isset($_POST["login"])){
$nickname = $_POST["nickname"];
$password = md5($_POST["password"]);
$lekerdezes = mysql_query("SELECT * FROM users WHERE nickname =
'".mysql_real_escape_string($nickname)."' AND password = '$password'");
$vanelekerdezes = mysql_num_rows($lekerdezes);
if ($vanelekerdezes>0)
{
header('location: login.php');
$adatok=mysql_fetch_assoc($lekerdezes);
$_SESSION["id"]=$adatok["id"];
$_SESSION['bann'] = 0;
$_SESSION["nickname"]=$adatok["nickname"];
$_SESSION["rank"]=$adatok["rank"];
$_SESSION["Gold"]=$adatok["Gold"];
$_SESSION["AtkDmg"]=$adatok["AtkDmg"];
}
else
{
print 'Hibás felhasználónév vagy jelszó!';
print mysql_error();
}
} else if(isset($_SESSION["nickname"])){
header('location: home.php');
}
?>
I hope you can help me, I'm still learning PHP, so maybe that's why I can't fix this simple thing... So if you would write: learn PHP, I'm already doing that :)

Answer 1

First, adjust the session var:
$gold = $_SESSION['Gold'] = $_SESSION['Gold'] - 50;
$attackDamage = $_SESSION['AtkDmg'] = $_SESSION['AtkDmg'] + 5;
Edit your SQL strings like this:
"UPDATE users SET AtkDmg = $attackDamage etc etc