[SilverDragonTears]

I edited my post with the correct warning, in case you didn't see that.

<?php


//***************//
//  START SCRIPT //
//***************//
$mysidia->user->getstatus();
if(!$mysidia->user->isloggedin){
   // The user is not logged in, show generic login error message
   $mysidia->displayerror("guest");
}
else
if($mysidia->user->status->canshop == "no"){
   // The user's permission to browse shops is banned, show error message
   $mysidia->page->settitle($lang->global_guest_title);
   $mysidia->page->addcontent($lang->denied);
}  
elseif(!$mysidia->input->get("shopname")){
   // The user has yet to enter a shop, so we may as well list the shop
   $mysidia->page->settitle($lang->access);
   $mysidia->page->addcontent($lang->type);
   $shoplist = new Shoplist($mysidia->input->post("shoptype"));
   $shoplist->display();
}
elseif(!$mysidia->input->get("itemname") and !$mysidia->input->get("adopttype")){
   // The user has entered a shop but not yet specified the item or adoptables to purchase
   $shoptype = $mysidia->db->select("shops", array("shoptype"), "shopname = '{$mysidia->input->get(shopname)}'")->fetchColumn();
   $shoplist = new Shoplist($shoptype);
   $shop = $shoplist->createshop($mysidia->input->get("shopname"));
   $mysidia->page->settitle($lang->welcome);
   $shop->display();
}
elseif($mysidia->input->get("itemname") and !$mysidia->input->get("adopttype")){
   // The user has specified an item to purchase, let's process this request
   $shop = new Itemshop($mysidia->input->get("shopname"));
   $item = $shop->getitem($mysidia->input->get("itemname"));
   $item->assign($mysidia->user->username);
   $oldquantity = $item->getoldquantity();
   $newquantity = $oldquantity + $mysidia->input->post("quantity");
   
   if(!is_numeric($mysidia->input->post("quantity"))){
      $mysidia->page->settitle($lang->global_action_title);
	  $mysidia->page->addcontent($lang->invalid_quantity);
   }
   elseif($newquantity > $item->cap){
      $mysidia->page->settitle($lang->global_error);
	  $mysidia->page->addcontent($lang->full_quantity);   
   }
   elseif($shop->purchase($item)){
      // The item is purchased successfully, now let's process the request
	  $mysidia->page->addcontent("{$lang->purchase_item}{$item->getcost($shop->salestax)} {$mysidia->settings->cost}");
   }
   else{
      $mysidia->page->settitle($lang->global_error);
	  $mysidia->page->addcontent($lang->money);  
   }   
}
elseif(!$mysidia->input->get("itemname") and $mysidia->input->get("adopttype")){
   // The user has specified an adoptable to purchase, let's process this request
   $shop = new Adoptshop($mysidia->input->get("shopname"));
   $adopt = $shop->getadopt($mysidia->input->get("adopttype"));
   $adopt->assign($mysidia->user->username);
   
   if($shop->purchase($adopt)){
      // The adoptable is purchased successfully, now let'ss process the request
	  $mysidia->page->addcontent("{$lang->purchase_adopt}{$adopt->getcost($shop->salestax)} {$mysidia->settings->cost}");
   }
   else{
      $mysidia->page->settitle($lang->global_error);
	  $mysidia->page->addcontent($lang->money);
   }
}
else{
   // Invalid action specified, show generic error message
   $mysidia->displayerror("action");
}

//***************//
//  OUTPUT PAGE  //
//***************//

$mysidia->output();

?>