Question

我已经尝试了几天（并且在这里阅读了大约20篇文章）并且似乎找到了我的问题的解决方案。我需要使用foreach循环遍历会话数组来检索三个（可能更多）键值对，我还需要在后续查询中使用它。

我需要这个，因为我们的商品价格取决于多个因素。

我最初使用for循环创建了一个购物车。这适用于我需要的东西（你会在下面看到）但我在尝试删除项目时遇到了麻烦。我从这里的问题帖子中了解到，我必须使用foreach循环。我相应地更改了它并且它有效，但是只有当我有一个键值对时。

有没有办法通过foreach循环实现我需要的东西？如果是这样，怎么样？

这是我在购物车会话数组中需要的内容：

$_SESSION['shop_cart'][$prodid]=$quantity;
$_SESSION['shop_cart']['season_price']=$season_priceid;

OR？

$_SESSION['shop_cart']['prodid']=$prodid;
$_SESSION['shop_cart']['quantity']=$quantity;
$_SESSION['shop_cart']['season_price']=$season_priceid; //This is the third variable I need

这是我的代码，包含foreach循环（包含前一个for循环的注释/注释），但只能使用一个键值对。

$prodid = $_POST['prodid'];
$quantity = $_POST['quantity'];
$season_priceid=$_POST['season_priceid'];
$empty= $_POST['empty']; 
$removed = $_POST['remove'];
$counter= $_POST['counter'];

if(isset($prodid))
{
 $_SESSION['shop_cart'][$prodid] = $quantity; 
}

   if (isset($empty ))
    {
    unset($_SESSION['shop_cart']);
    }


if (!isset($_SESSION['shop_cart']))//Checking if Session is Set or empty
   {
      unset($_SESSION['shop_cart']);
      echo "Cart is empty";
   }
   else
   {
      if(count($_SESSION['shop_cart'])==NULL || count($_SESSION['shop_cart'])==0 )
      {
         echo "Cart is empty";
      }
   }



    if (isset($removed)) 
    {
    foreach ($_SESSION['shop_cart'] as $cart_line_item => $item)
       {
        if($prodid==$item['prodid'])
            {
            unset($_SESSION['shop_cart'][$cart_line_item]); 
            continue;
            }   
        }
    }


  $_SESSION['shop_cart'][$prodid] = $quantity;           



$total=0; //For Price

 if (isset($_SESSION['shop_cart']))  
  {
    /*
    for($i=0;$i<count($_SESSION['shop_cart']);$i++) //The previous FOR LOOP works but cannot delete items correctly
    */
    foreach ($_SESSION['shop_cart'] as $prodid => $quantity)
    {
        /* //This is how the cart-display array was created with the FOR LOOP. As you can see here, I need three values to show in my cart array
        $prodid=$_SESSION['shop_cart'][$i]['prodid'];
        $quantity=$_SESSION['shop_cart'][$i]['quantity'];
        $season_priceid =$_SESSION['shop_cart'][$i]['season_priceid'];
        */

        $query = "SELECT prodid, description, price FROM products, seasons WHERE prodid = $prodid AND season_id= $season_priceid"; //###I NEED THIS THIRD VARIABLE next variable to get the right price)###
        $result = mysqli_query($hook, $query);
        $row = mysqli_fetch_assoc($result);
        $prodid = $row['prodid'];
        $price = $row['price'];
        $description= $row['description'];


        $subtotal = $price * $quantity;
                     $total += $subtotal;

echo "$description($prodid)---Quantity: $quantity--- $$price";      

echo "<form action=\"$_SERVER[SCRIPT_NAME]\" method=\"post\" >";
echo "<INPUT TYPE=\"submit\" name=\"remove\" VALUE=\"Remove\">";
echo "<input type=\"hidden\" name=\"prodid\" value=$prodid />\n";
echo "</FORM>";

echo "--------------------------<br/><br/>";

    }                                                             
  }

echo "TOTAL $total <br/><br/>";

echo '<pre>'. var_dump( $_SESSION['shop_cart']).'<pre/>';

echo "<br/>";

echo "<form action=\"$_SERVER[SCRIPT_NAME]\" method=\"post\" >";
echo "<INPUT TYPE=\"submit\" name=\"empty\" VALUE=\"Empty Cart \">";
echo "</FORM>";

尝试以下但没有任何作用：

    foreach ($shop_cart as $key =>$val) {           
                $season_priceid = $key['season_priceid'];
            //OR
                $season_priceid = $val['season_priceid'];     
        }

///////////

    foreach ($shop_cart as $val) {
        $season_priceid = $val['season_priceid'];
    }


///////////

    foreach ($shop_cart as $cart_arrays) {
                $season_priceid =$shop_cart['season_priceid'];
    }

如果这有助于我的数组使用不同的循环看起来像：

FOR LOOP ARRAY
array(3) { [0]=> array(3) { ["prodid"]=> string(2) "13" ["quantity"]=> string(1) "1" ["season_priceid"]=> NULL } [1]=> array(3) { ["prodid"]=> string(1) "6" ["quantity"]=> string(1) "1" ["season_priceid"]=> NULL } [2]=> array(3) { ["prodid"]=> string(1) "2" ["quantity"]=> string(1) "1" ["season_priceid"]=> NULL } }


FOREACH ARRAY (but I need a third element/value : "season_priceid")
array(3) { [2]=> string(1) "1" [6]=> string(1) "1" [3]=> string(1) "1" }

Answer 1

因此，您的代码中的真正问题是您的会话中的season_priceid为NULL。这意味着您设置season_priceid的代码无法正常工作。由于您的代码没有显示您的会话设置，我无法帮助您，但以下是我建议您设置购物车会话数据的方式：

'shop_cart' => array (
    '14' => array ( // 14 is product id
        'quantity' => 1,
        'season_priceid' => 1
    ),
    '15' => array ( // 15 is product id
        'quantity' => 1,
        'season_priceid' => 1
    ),
)

这样你可以像这样循环购物车：

foreach ($_SESSION['shop_cart'] as $prodid => $product) {
    echo $prodid;                    // product id
    echo $product['quantity'];       // quantity
    echo $product['season_priceid']; // season price id

    // to delete the product from the session
    unset($_SESSION['shop_cart'][$prodid];

   // to edit the product quantity
   $_SESSION['shop_cart'][$prodid]['quantity'] = 2;
}

使用Foreach循环检索多个键值对

1 个答案: