[Kyttias]

What are:

• the names of both your currencies? (VAR_A, VAR_B)
• the name of the column you added to the shop table (which would be the same as the variable name you added to the top of the page)? (VAR_C)
• the name of the column in the users table that holds the amount of the secondary currency? (VAR_D)

I was thinking it'd be something vaguely like this?

public function purchase(Item $item){
$mysidia = Registry::get("mysidia");
if($item->owner != $mysidia->user->username) Throw new NoPermissionException('Something is very very wrong, please contact an admin asap.');
else{

if ($VAR_C == "VAR_A") {
$item->quantity = $mysidia->input->post("quantity");
$cost = $item->getcost($this->salestax, $item->quantity);
$moneyleft = $mysidia->user->money - $cost;
if($moneyleft >= 0 and $item->quantity > 0){
$purchase = $item->append($item->quantity, $item->owner);
$mysidia->db->update("users", array("money" => $moneyleft), "username = '{$item->owner}'");
$status = TRUE;
}
else throw new InvalidActionException($mysidia->lang->money);
}
if ($VAR_C == "VAR_B") {
$item->quantity = $mysidia->input->post("quantity");
$cost = $item->getcost($this->salestax, $item->quantity);
$moneyleft = $mysidia->user->VAR_D - $cost;
if($moneyleft >= 0 and $item->quantity > 0){
$purchase = $item->append($item->quantity, $item->owner);
$mysidia->db->update("users", array("money" => $moneyleft), "username = '{$item->owner}'");
$status = TRUE;
}
else throw new InvalidActionException($mysidia->lang->money);
}

}
return $status;
}