Php 非常简单的购物车，删除按钮

我正在编写销售软件，它将遍历一组页面，在某些页面上列出要销售的项目，当您单击“购买”时，它基本上只是将一个隐藏变量传递到下一个页面以设置为会话变量，然后当您到达末尾时，它的调用将报告给数据库。然而，我的雇主希望我包括一个购物车，这个购物车应该显示物品名称、sku和你正在购买的任何物品的价格，以及一个删除按钮，这样做脚本的人就不需要返回整个过程来删除一个物品。目前，我已将购物车设置为显示所有内容，这相当简单。但我不知道如何让删除按钮工作。以下是购物车的代码：

        $total = 0;
    //TEST CODE:
    $_SESSION['itemname-addon'] = "Test addon";
    $_SESSION ['price-addon'] = 10.00;
    $_SESSION ['sku-addon'] = "1234h";

    $_SESSION['itemname-addon1'] = "Test addon1";
    $_SESSION ['price-addon1'] = 99.90;
    $_SESSION ['sku-addon1'] = "1111";

    $_SESSION['itemname-addon2'] = "Test addon2";
    $_SESSION ['price-addon2'] = 19.10;
    $_SESSION ['sku-addon2'] = "123";
    //end test code


    $items = Array
    (
            "0"=> Array
            (
                "name" => $_SESSION['itemname-mo'],
                "price" => $_SESSION ['price-mo'],
                "sku" => $_SESSION ['sku-mo']
            ),
            "1" => Array
            (
                "name" => $_SESSION['itemname-addon'],
                "price" => $_SESSION ['price-addon'],
                "sku" => $_SESSION ['sku-addon']
            ),
            "2" => Array
            (
                "name" => $_SESSION['itemname-addon1'],
                "price" => $_SESSION ['price-addon1'],
                "sku" => $_SESSION ['sku-addon1']
            ),
            "3" => Array
            (
                "name" => $_SESSION['itemname-addon2'],
                "price" => $_SESSION ['price-addon2'],
                "sku" => $_SESSION ['sku-addon2']
            )

        );

    $a_length = count($items);

    for($x = 0; $x<$a_length; $x++){
    $total +=$items[$x]['price']; 
    }
    $formattedtotal = number_format($total,2,'.','');
    for($i = 0; $i < $a_length; $i++){
    $name = $items[$i]['name'];
    $price = $items[$i]['price'];
    $sku = $items[$i]['sku'];
    displaycart($name,$price,$sku);
    }
    echo "<br />
    <b>Sub Total:</b> 
    $$formattedtotal";

        function displaycart($name,$price,$sku){

            if($name != null || $price != null || $sku != null){

            if ($name == "no sale" || $price == "no sale" || $sku == "no sale"){
            echo ""; 
            }
            else{
                $formattedprice = number_format($price,2,'.','');
                echo "$name: $$formattedprice ($sku)";
                echo "<form action=\"\" method=\"post\">";
                echo "<button type=\"submit\" />Remove</button><br />";
                echo "</form>";
            }

            }
        }

$total=0；
//测试代码：
$\会话['itemname-addon']=“测试加载项”；
$\会话['price-addon']=10.00；
$\会话['sku-addon']=“1234h”；
$\会话['itemname-addon1']=“测试addon1”；
$\会话['price-addon1']=99.90；
$\会话['sku-addon1']=“1111”；
$\会话['itemname-addon2']=“测试addon2”；
$\会话['price-addon2']=19.10；
$\会话['sku-addon2']=“123”；
//结束测试代码
$items=数组
(
“0”=>数组
(
“name”=>$\u会话['itemname-mo']，
“价格”=>$\u会话['price-mo']，
“sku”=>$\u会话['sku-mo']
),
“1”=>数组
(
“name”=>$\u会话['itemname-addon']，
“price”=>$\u会话['price-addon']，
“sku”=>$\u会话['sku-addon']
),
“2”=>数组
(
“name”=>$\u会话['itemname-addon1']，
“price”=>$\u会话['price-addon1']，
“sku”=>$\u会话['sku-addon1']
),
“3”=>数组
(
“name”=>$\u会话['itemname-addon2']，
“price”=>$\u会话['price-addon2']，
“sku”=>$\u会话['sku-addon2']
)
);
$a_长度=计数（$items）；
对于（$x=0；$x），您可以在会话变量上使用数组，以便将格式更改为

$_SESSION[items][] = ("name"=>$name, "sku"=>$sku, "price"->$price)

在
函数displaycart（）中添加元素

echo "<input type='hidden' name='delete_sku' value='$sku'>\n";

$delete_sku = $_POST[delete_sku]; // the posted ID sent from delete form
$i = 0;
foreach ($_SESSION[items] as $item) {
    if ($item['sku'] == $delete_sku) {
        unset ($_SESSION[$i]);  // remove the item from the session array
    }
    $i++;
}
print_r ($_SESSION);