只需要从我的购物车中删除一个产品，而不是所有具有相同ID的产品 - only need to delete one product from my cart, not all products with same ID

only need to delete one product from my cart, not all products with same ID

本文关键字：ID 一个我的购物车删除 | 更新日期: 2023-09-27

我不明白为什么这段代码不仅会删除通过URL传递的给定键的pizza_id。我回显$_GET['key']值来检查我是否有所需的数字，它工作得很好。键值来自另一个foreach $key=>$value循环，该循环构建了购物车，并有一个带有pizza id和$key的删除链接。

switch ($action) {
    case 'add':
        if ($cart) {
            $cart .= ','.$_GET['pizza_id'];
        } else {
            $cart = $_GET['pizza_id'];
        }
        break;
    case 'delete':
        echo "KEY: ".$_GET['key']."<br>";
        if ($cart) {
            $items = explode(',',$cart);
            $newcart = '';
            foreach ($items as $key => $item) 
            {
                if ($_GET['pizza_id'] != $item && $GET['key']!= $key ) 
                {
                    if ($newcart != '') 
                    {
                        $newcart .= ','.$item;
                    } 
                    else 
                    {
                        $newcart = $item;
                    }
                }
            }
            $cart = $newcart;
        }
        break;
}

编辑:也许我也应该提到的基础代码来自这个网页http://v3.thewatchmakerproject.com/journal/276/

至少，您不需要在foreach中使用$key。

if ($cart) {
    // you car is now an array of $items.
    $items = explode(',',$cart);
    $key = $_GET[ 'key' ];
    // are you sure pizza_id is correct too? You may want to echo/log it
    // if there is an $item which corresponds to $key, remove it.
    if( isset( $items[ $key ] ) )
          unset( $items[ $key ] );
    // this loop searches for all indexes of $_GET[ 'pizza_id' ] and removes them
    // comment this out if you don't want to do that. For some reason 
    // I missed it the first go round.
    while( ($pos = $array_search( $items, $_GET[ 'pizza_id' ] ) !== FALSE )
    {
        array_splice( $items, $pos, 1 );
    }
    // implode afterwards
    $cart = implode( ',', $items );
}

另一个评论者指出你的原始代码也有$GET['key']。10000年坏处。在开发期间，您是否将警告和错误输出设置为最大级别?

检查是否可以

foreach ($items as $key => $item) 
                            {
                if ($_GET['pizza_id'] != $item && $GET['key']!= $item )

我不明白你的问题…但是你的if条件有个错别字

$GET[

缺少下划线…