Help Parsing Data

[refiking]

I am trying to echo a product id from an array, but can't seem to figure out what I need to do here.  Here is what I get when I run the query:

 

Array ( [23{1}17{2}36{3}37{4}24] => Array ( [qty] => 1 [attributes] => Array ( [1] => 17 [2] => 36 [3] => 37 [4] => 24 ) ) [81{1}17{8}50{2}23{3}37{4}24] => Array ( [qty] => 1 [attributes] => Array ( [1] => 17 [8] => 50 [2] => 23 [3] => 37 [4] => 24 ) ) )

2

8

 

 

I am trying to get 23<br>81, basically just the product id (everything before the {).  Here is the code that produced the results above:

 

  print_r($cart->contents); echo '<br>';
  //print_r($order->products);
  $array = $cart->contents;//$order->products;
	foreach ($array as $i => $value) {
    		echo $i[0].'<br>';
	}