And Sign before foreach loop

[vinpkl]

hi

i got this code while googling on net

 foreach ($_SESSION["cart_array"] as &$each_item) { 
            if ($each_item['item_id'] == $pid) {
                $each_item['quantity'] += 1;
                $wasFound = true;
                break;
            }

can someone tell me what does "&" sign before $each_item signifies

what is the use of "&" sign before $each_item in foreach loop

vineet