如何将商品添加到购物车后递增会话 ID 变量

我正在使用一个购物车项目，用户可以在其中将多个项目添加到购物车并从购物车中删除该项目我正在使用会话添加一件商品后，我在每件商品上逐个递增 ID 将新商品添加到购物车中代码工作正常，当我尝试从物品托盘中删除商品时，只有在删除时才有问题 它只删除一个项目 这是我的代码

<?php
session_start();
if(!empty($_GET["action"])) {
switch($_GET["action"]) {
   case "add":
   if(!isset($_SESSION['cart'])) {
           $item_id_session = 1;
           $_SESSION['cart'] = array();
    }
    else
        {
            $count = count($_SESSION['cart']); 
            $item_id_session = $count++;
        }
            $item = array();
            $item['item_id_session']= $item_id_session ;
            $item['title']=$_REQUEST['title'];
            $item['length_m']  =$_REQUEST['length_m'];
            $item['length_md']=$_REQUEST['length_md'];
            $item['length_cm'] =$_REQUEST['length_cm'];
            $item['length_cmd']=$_REQUEST['length_cmd'];
            $item['width_m']=$_REQUEST['width_m'];
            $item['width_md']=$_REQUEST['width_md'];
            $item['width_cm']=$_REQUEST['width_cm'];
            $item['width_cmd']=$_REQUEST['width_cmd'];
            $item['height_m']=$_REQUEST['height_m'];
            $item['height_md']=$_REQUEST['height_md'];
            $item['height_cm']=$_REQUEST['height_cm'];
            $item['height_cmd']=$_REQUEST['height_cmd'];
            $item['weight']=$_REQUEST['weight'];
            $item['weightd']=$_REQUEST['weightd'];
            $item['quantity']=$_REQUEST['quantity'];
            $item['image']=$_FILES["image"]["name"];
            $target_dir = "profile_images/";
            $item['image']= "profile_images/" . $_FILES["image"]["name"];
            $imageFileType = pathinfo($item['image'],PATHINFO_EXTENSION);
            $check = getimagesize($_FILES["image"]["tmp_name"]);
         if($check !== false) {
         echo "File is an image - " . $check["mime"] . ".";
        //$uploadOk = 1;
         move_uploaded_file($_FILES["image"]["tmp_name"], $item['image']);
         echo "The file ". basename( $_FILES["image"]["name"]). " has been uploaded.";
         }
           $_SESSION['cart'][] = $item;
   break;
   case "remove":
     if(!empty($_SESSION["cart"])) {
      foreach($_SESSION["cart"] as $k => $v) {
          if($_GET['item_id_session'] == $k)
            unset($_SESSION["cart"][$k]); 
            unset($_SESSION['cart'][$item_id_session]);      
          if(empty($_SESSION["cart"]))
            unset($_SESSION["cart"]);
      }
    }
   break;
     }
}
?>

这是我的删除按钮代码

    <a href="step3.php?action=remove&id=<?php echo $item["item_id_session"];?>"class="product-title">
    <span class="glyphicon glyphicon-trash pull-right"></span>
    </a>