Question

（这篇文章可能会有很长的篇幅，但请耐心等待，并帮助我找到解决方案）

我有一个产品表，有各种参数，主要参数是它的大小和成本。每个产品尺寸分为3个部分，即小型，中型和大型，其成本也可根据产品的尺寸分为3个部分。为此，我创建了另一个表格产品，其中包含每种产品的尺寸和成本。

prodsize表的小视图是

我有另一个购物车，它包含用户订购的产品的价值

购物车表的小视图

现在我希望将这两个表组合在一起，并有一个数组，显示每个大小的大小以及用户为特定产品的每个大小订购的数量。为此，我写了下面的代码

$sql = "SELECT catname,GROUP_CONCAT(prodsize) as sizes,GROUP_CONCAT(cost) as price,prodname,prodimg,catid,productid FROM productsize where catid='".$catid."' group by productid";
    $result = mysqli_query($con, $sql);
    if (mysqli_num_rows($result) > 0) 
        {
            while($row = mysqli_fetch_assoc($result))
                {
                    $pid=$row['productid'];
                    $rows['catname'] = $row['catname'];
                    $rows['sizes'] = $row['sizes'];
                    $rows['price'] = $row['price'];
                    $rows['prodname'] = $row['prodname'];
                    $rows['prodimg'] = $row['prodimg']; 
                    $rows['catid'] = $row['catid'];     
                    $rows['productid'] = $row['productid'];

                    $user_sql = "SELECT group_concat(prodsize) as purchased_size,group_concat(quantity) as purchased_quantity,catid,userid FROM `cart` where userid='$userid' and catid='$catid' and productid='$pid'";

                    $user_result = mysqli_query($con, $user_sql);
                    if (mysqli_num_rows($user_result) > 0) 
                        {   
                            while($user_row = mysqli_fetch_assoc($user_result))
                                {
                                    $rows['purchased_size'] = $user_row['purchased_size'];
                                    $rows['purchased_quantity'] = $user_row['purchased_quantity'];
                                    $rows['userid'] = $user_row['userid'];
                                }
                        }

                    $post_rows[]=$rows;     
                }       
                echo "<pre>";
                print_r($post_rows);
                echo "</pre>";
        }

我通过print_r（$ post_rows）获得的数组是

Array
(
    [0] => Array
        (
            [catname] => Main Course
            [sizes] => small,medium,large
            [price] => 130,170,200
            [prodname] => pies
            [prodimg] => 
            [catid] => 2
            [productid] => 13
            [purchased_size] => small,large
            [purchased_quantity] => 1,1
            [userid] => 1
        )

    [1] => Array
        (
            [catname] => Main Course
            [sizes] => small,medium,large
            [price] => 50,90,110
            [prodname] => Squash
            [prodimg] => 
            [catid] => 2
            [productid] => 14
            [purchased_size] => medium
            [purchased_quantity] => 1
            [userid] => 1
        )

    [2] => Array
        (
            [catname] => Main Course
            [sizes] => small,medium
            [price] => 70,110
            [prodname] => corns
            [prodimg] => 
            [catid] => 2
            [productid] => 15
            [purchased_size] => 
            [purchased_quantity] => 
            [userid] => 
        )
)

现在，我想要的更改位于[purchased_size]和[purchased_quantity]。我要那个如果用户尚未为特定产品购买任何内容，那么[purchased_size]和[purchased_quantity]中的值应为0,0,0，如果用户购买了一种尺寸的产品，就像壁球一样，用户选择媒介然后[purchase_size]和[purchase_quantity]中的其他值shouuld转0,0如果他订购了2个尺寸，那么[purchase_size]和[purchase_quantity]中的第3个值应该为0

所以新数组应该看起来像下面给出的数组（IMP点，尺寸和成本的顺序应该是固定的，即小，中，大）

Array
(
    [0] => Array
        (
            [catname] => Main Course
            [sizes] => small,medium,large
            [price] => 130,170,200
            [prodname] => pies
            [prodimg] => 
            [catid] => 2
            [productid] => 13
            [purchased_size] => small,0,large
            [purchased_quantity] => 1,0,1
            [userid] => 1
        )

    [1] => Array
        (
            [catname] => Main Course
            [sizes] => small,medium,large
            [price] => 50,90,110
            [prodname] => Squash
            [prodimg] => 
            [catid] => 2
            [productid] => 14
            [purchased_size] => 0,medium,0
            [purchased_quantity] => 0,1,0
            [userid] => 1
        )

    [2] => Array
        (
            [catname] => Main Course
            [sizes] => small,medium
            [price] => 70,110
            [prodname] => corns
            [prodimg] => 
            [catid] => 2
            [productid] => 15
            [purchased_size] => 0,0,0
            [purchased_quantity] => 0,0,0
            [userid] => 
        )

)

Answer 1

这里的问题在于你做事的方式，最终你会遇到一些麻烦，因为你正在处理从你的数据库中获取的数据，并重新格式化它以适应目的的细微差别，而不仅仅是存储＆amp;首先以正确的方式检索数据。

对于您正在处理的每种产品/尺寸，理想情况下，产品表中应该有单独的产品ID，因此您可以跟踪库存水平等，并在每个有形商品的购物车/购物篮场景中处理数量......无论如何直接回答您的问题，此代码为您的特定目的进行所需的转换：

$rows['sizes'] = 'small,medium,large';
$available_sizes = explode(',', $rows['sizes']);
$rows['purchased_size'] = 'medium';
$purchased_sizes = explode(',', $rows['purchased_size']);
$rows['purchased_quantity'] = 1;
$purchased_quantity = explode(',', $rows['purchased_quantity']);

echo '<pre>';
echo '$purchased_sizes: ' . print_r($purchased_sizes, true);
echo '</pre>';
echo '<pre>';
echo '$purchased_quantity: ' . print_r($purchased_quantity, true);
echo '</pre>';

$rows['purchased_size'] = '';
$rows['purchased_quantity'] = '';
foreach ($available_sizes as $key => $size) {
    $rows['purchased_size'] .= in_array($size, $purchased_sizes) ? $size : 0;
    $rows['purchased_quantity'] .= in_array($size, $purchased_sizes) ? array_shift($purchased_quantity) : 0;
    if ($key != count($available_sizes)-1) {
        $rows['purchased_size'] .= ',';
        $rows['purchased_quantity'] .= ',';
    }
}

echo '<pre>';
echo '$rows[purchased_size]: ' . print_r($rows['purchased_size'], true);
echo '</pre>';
echo '<pre>';
echo '$rows[purchased_quantity]: ' . print_r($rows['purchased_quantity'], true);
echo '</pre>';

以上输出：

$purchased_sizes: Array
(
    [0] => medium
)
$purchased_quantity: Array
(
    [0] => 1
)
$rows[purchased_size]: 0,medium,0
$rows[purchased_quantity]: 0,1,0

在数组中添加其他值

1 个答案: