php – 无法正确创建数组

我有2个表产品和购物车.我加入了2个表并创建了一个单个数组,但是这个数组的一部分我没有正确获取数据.产品尺寸表有4种尺寸(小,中,大,每件)的产品.

我从2个表中得到的数组就像下面的数组一样,这里的主要部分是4个数组： – size,cost,purchasesize,purchasequantity 0索引值应保留为small,1为medium 2为large和3为perpiece.

Array
(
    [0] => Array
        (
            [productid] => 1
            [size] => Array
                (
                    [0] => small //reserved for small
                    [1] => medium //reserved for medium
                    [2] => large //reserved for large
                    [3] => 0 //reserved for perpiece
                )
            [cost] => Array
                (
                    [0] => 10 //reserved for small
                    [1] => 20 //reserved for medium
                    [2] => 30 //reserved for large
                    [3] => 0 //reserved for perpiece
                )
            [purchasedsize] => Array
                (
                    [0] => small //reserved for small
                    [1] => 0 //reserved for medium
                    [2] => large //reserved for large
                    [3] => 0 //reserved for perpiece
                )
            [purchasedquantity] => Array
                (
                    [0] => 2 //reserved for small
                    [1] => 0 //reserved for medium
                    [2] => 3 //reserved for large
                    [3] => 0 //reserved for perpiece
                )
        )
)

问题是这种定位适用于阵列尺寸和成本,但在购买尺寸,购买数量,如果购物车有尺寸perpiece的产品,那么它转移到索引值0

数组变得如下所示,但在购买数量和购买数量下,应该是指数值3

Array
(
    [0] => Array
        (
            [productid] => 2
            [size] => Array
                (
                    [0] => 0
                    [1] => 0
                    [2] => 0
                    [3] => perpiece
                )
            [cost] => Array
                (
                    [0] => 0
                    [1] => 0
                    [2] => 0
                    [3] => 40
                )
            [purchasedsize] => Array
                (
                    [0] => perpiece
                    [1] => 0
                    [2] => 0
                    [3] => 0
                )
            [purchasedquantity] => Array
                (
                    [0] => 1
                    [1] => 0
                    [2] => 0
                    [3] => 0
                )
        )
)

产品化表

id  productid   prodsize   cost
1     1          small      10
2     1          medium     20
3     1          large      30
4     2          perpiece   40

购物车表

id  productid  prodsize  prodcost  quantity
1     1         small      10        2
2     1         large      30        3
3     2         perpiece   40        1

我正在使用的代码是

$sql= "SELECT p.productid,GROUP_CONCAT(p.prodsize ORDER BY p.id ASC) as size,GROUP_CONCAT(p.cost ORDER BY p.id ASC) as cost,GROUP_CONCAT(c.prodsize,'-',c.quantity) as cart_details,GROUP_CONCAT(DISTINCT(c.userid)) as user_id FROM productsize p LEFT JOIN cart c ON(c.productid = p.productid AND p.prodsize = c.prodsize) GROUP BY p.productid ORDER BY user_id DESC,p.productid ASC";
$result = mysql_query($sql);
if (mysql_num_rows($result) > 0) 
    {
        $i = 0;
        while($row = mysql_fetch_assoc($result))
            {
                $rows[$i]['productid'] =  $row['productid'];
                $final_size = array_fill(0,4,'0');
                $final_cost = array_fill(0,'0');


                $size = explode(',',$row['size']);
                $cost = explode(',$row['cost']);

                foreach($size as $k=>$sizecol) {
                    switch($sizecol) {
                        case 'Small':
                            $array_key = '0';
                            break;
                        case 'Medium':
                            $array_key = '1';
                            break;
                        case 'Large':
                            $array_key = '2';
                            break;
                        case 'Perpiece':
                            $array_key = '3';
                            break;
                    }
                    $final_size[$array_key] = $sizecol;
                    $final_cost[$array_key] = $cost[$k];

                }


                $cart_details = explode(',$row['cart_details']);
                $purchasedsize = array_fill(0,'0'); 
                $purchasedquantity = array_fill(0,'0');
                foreach($cart_details as $cart) {
                    if($cart != '') {
                        $details = explode('-',$cart);
                        $key = array_search($details[0],$size);

                        $purchasedsize[$key] = $details[0];
                        $purchasedquantity[$key] = $details[1];
                    }

                }

                $rows[$i]['size'] = $final_size;
                $rows[$i]['cost'] = $final_cost;
                $rows[$i]['purchasedsize'] = $purchasedsize;
                $rows[$i]['purchasedquantity'] = $purchasedquantity;
                $rows[$i]['userid'] = $row['user_id'];

                $i++; 
            }   
    }