Help with shopping cart. Almost there!

[dachshund]

To add items to my shopping cart the user must select a size and then click 'add to basket'.

 

When they do this is adds the item and corresponding size to a string in this format 1s2 where 1 is the id and 2 is the size.

 

Multiple items would look like this 1s2,2s1,1s2

 

That's all fine. The problem I am now having is getting the code to recognise 1s2 exists twice in the string and putting the $qty to 2 for that item.

 

Here is my current code. Any help on this would be HUGELY appreciated as it's doing my head in!

 

Thanks!

 

<div id="view_basket">
			<ul>
			<?php
			$basket = $_SESSION['basket'];

			if ($basket) {
    			        $data = preg_split("#[s,]#", $basket);
    			        $data = array_chunk($data, 2);
    			
    			        foreach($data as $key => $val)
    			
        		        $contents[] = (isset($contents[$data])) ? $contents[$data] + 1 : 1;
			echo '<form action="basket.php?action=update" method="post">';
			echo '<table>';
			foreach ($data as $id=>$qty) {
			$sql = "SELECT * FROM store WHERE id LIKE '$id' AND live LIKE '0'";
			$result = mysql_query($sql);
			while ($rows = mysql_fetch_array($result))	{
			extract($rows);
			?>

				<li>
					<div id="view_basket_image">
					<img src="<?php echo $rows['indeximage']; ?>" />
					</div>

					<div id="view_basket_title">
					<span class="view_basket_brand"><?php echo $rows['brand']; ?> ·</span> <span class="view_basket_description"><?php echo $rows['title']; ?></span>
					</div>

					<div id="view_basket_qty">
					<input type="text" name="qty<?php echo $id; ?>" value="<?php echo $qty; ?>" size="3" maxlength="3" class="view_basket_qty" />
					</div>

					<div id="view_basket_price">
					<span class="view_basket_x">x</span>£<?php echo $rows['price']; ?>
					<?php
					/* WORK OUT ITEM WEIGHTS */
					$itemweight = $rows['weight'] * $qty;
					$totalweight += $rows['weight'] * $qty;
					?>
					</div>

					<div id="view_basket_itemtotal">
					<?php $itemtotalprice = $rows['price'] * $qty; $itemtotal = number_format($itemtotalprice, 2, '.', ','); echo '&pound'; echo $itemtotal;
					$total += $rows['price'] * $qty;
					?>
					</div>
					<div class="clear"></div>
				</li>
				<?php
				}
				}
				?>
			</ul>
		</div>
<?php
}
?>