PHP Winkelwagen

(Voor de link naar de code, zie benenden)

Hallo,

Ik ben bezig met het bouwen van een webshop, maar ik heb een probleem met mijn winkelwagentje.
Ik heb geprobeerd om de producten in de winkelwagen te zetten/onthouden, met session's en array's, maar blijkbaar zit er ergens een fout.

Ik had dus de vraag, wat kan ik veranderen aan mijn script? Of moet ik een hele andere methode hiervoor gebruiken?

Alvast bedankt.

Code hieronder:

Product pagina:
<input name="art_amount" type="text" value="1"/>
<input type="hidden" name="art_id" value="<?=$info[0]['productid'];?>" />
<input type="hidden" name="articlenr"  value="<?=$info[0]['article_number'];?>" />
<input type="hidden" name="page_id" value="<?=$info[0]['id'];?>" />
<input type="hidden" name="art_price" value="<?=$info[0]['price'];?>" />
<input type="hidden" name="art_shippingcosts" value="<?=$info[0]['shipping_costs'];?>" />
<input type="hidden" name="current_url" value="<?=$_SERVER['REQUEST_URI'];?>" />
<input type="hidden" name="art_name" value="<?=$info[0]['title'];?>" />
<input type="hidden" name="tax" value="21" />
<input type="hidden" name="user_cmd" value="add_art" />

Addproduct functie:
<?php
function add_article()
{
	  global $settings;
	  $errmessg='';
	  if(isset($_POST['is_offerte']) && $_POST['is_offerte'] == '1'){
		$_SESSION['is_offerte']=1;
	  }else{
		$_SESSION['is_offerte']=0;
	  }


	  $article['artid']=(int)$_POST['art_id'];
	  $tax=$_POST['tax'];
	  $query="SELECT `price`,`discount` FROM `producten` WHERE `id`='".$article['artid']."' LIMIT 0,1";
	  $sql=mysql_query($query);
	  if(!$sql && mysql_num_rows($sql) != 1){
		  $errmessg.='Geen product gevonden!<br />';
		}else{
		  $row_product=mysql_fetch_assoc($sql);
		}

	  $art_url=id2url($article['artid']);

	  $discount=$row_product['discount'];
	  $art_price=(float)$row_product['price'];

	  if($discount > 0){
		  $art_price2 = $art_price - $discount;
		  $art_price = number_format($art_price2 + ($art_price2 / 100) * $tax, 2, ',', '');
	  }	

	  if(!$art_price){
		$errmessg.='<div class="contentcontent">Ongeldige prijs!</div>';
	  }else{
		$article['price']=$art_price;
	  }

	  $article['name']=$_POST['art_name'];
	  $article['articlenr']=$_POST['articlenr'];
	  if(isset($_POST['art_shippingcosts'])){
		$article['shippingcosts']=$_POST['art_shippingcosts'];
	  }else{
		$article['shippingcosts']=-1;
	  }

	  if(isset($_POST['art_amount'])){
		$article['amount']=(int)$_POST['art_amount'];
	  }else{
		$article['amount']=1;
	  }
	  $article['page_id']=(int)$_POST['page_id'];
	  if($article['amount'] < 1){
		$article['amount']=1;
	  }


	  if(isset($_SESSION['articles'])){
		$articles=$_SESSION['articles'];
	  }else{
		$articles=array();
	  }

	  if($errmessg == ''){
		foreach($articles as $artsessid=>$article_line){

			if($article_line['artid'] == $article['artid']){
				$article['amount']=$article['amount']+$article_line['amount'];
				unset($articles[$artsessid]);
			}

		}

		if ($article['name'] != '' && $article['amount'] >0){
				$articles['art_'.uniqid()]=$article;
				}

	  }

	  if($errmessg){
		echo '<div style="width:100%">'.$errmessg.'</div>';
		return false;
	  }else{
		$_SESSION['articles']=$articles;
	  }
  return true;
}
?>

Listproduct functie:
<?php
function list_articles()
{
	global $url, $settings;
	$is_included='list_articles';
	$discount=0;
	if(isset($_POST['current_url'])){
		if($_POST['current_url'] != '')
		{
			echo '<a class="terugwebshoplink" href="'.$_POST['current_url'].'">Terug naar webshop</a><br />';
		}
	}
	if(isset($_SESSION['articles'])){
	  $articles=$_SESSION['articles'];
	}else{
	  $articles=array();
	}
	foreach($_POST as $waarde=>$inhoud){
		if(substr($waarde,0,4) == 'del_' && substr($waarde,-2) == '_x') {
			$this->del_article(substr($waarde,4,-2));
			$articles=$_SESSION['articles'];
		}
	}
	
	$subtotaal=0;
	foreach($articles as $name=>$line){
			if (isset($_POST['number_'.$name]))
			{
				if($_POST['number_'.$name] != $line['amount'])
				{
					$line['amount']=$_POST['number_'.$name] ;
					$articles[$name]=$line;
					$_SESSION['articles']=$articles;
				}
			}
			$bedrag=$line['price'];
			$subtotaal=$subtotaal + ($bedrag * $line['amount']);
		}
	if(!SHOP_BTW_INCL){
		
	  $tax=($subtotaal / 100) * $settings['tax'];
	  $totaal=($subtotaal - $line['discount']) + $tax;
	}else{
	  $tax=($subtotaal / 100) * $settings['tax'];
	  $totaal=($subtotaal - $line['discount']) + $tax;
	}

	if (count($articles) >0){
	  include('classes_files/list_articles.php');
	}else{
	  echo 'Uw winkelwagen is leeg op het moment<br />';
	}
}
?>

Url2id funtie:
<?php
function id2url($paginaid){
	$i=0;
	$zoek_url='';
	while ($paginaid != 0 && $i<100) {
		$i++;
		$query1 = "SELECT `url`, `id`, `volg` FROM `pagina` WHERE `id` = '".$paginaid."' LIMIT 0,1";
		$result1 = mysql_query($query1) or die (mysql_error());
		while($row1 = mysql_fetch_array($result1)) {
			$zoek_url = $row1["url"] . "/" . $zoek_url;
			$paginaid = $row1["volg"];
		}
	}
	return $zoek_url;
}
?>