有人可以帮助我吗？因为我想不通。
假设我有一个包含两个表的数据库，一个是类别，一个是产品
category table
cat_id category_name
1 animals
2 fruits
3 vegetables
product table
pro_id category_id product_name
1 2 mango
2 3 beans
3 2 apple
4 1 cat
我尝试在类别表上按cat_id选择猫ID顺序当猫桌循环播放时....{我尝试使用cat_id在产品表上选择产品当产品表循环时..{我只想把它放在一个好的格式的数组中}
}
示例结果为
Array
(
[fruits] => Array
(
from cat_id --> [2] => Array
(
[pro_id] => 1
[name] => mango
)
from cat_id --> [2] => Array
( [id] => 3
[name] => apple
)
),
[vegetables] => Array
(
from cat_id --> [3] => Array
(
[pro_id] => 2
[name] => beans
)
),
[animals] => Array
(
from cat_id --> [1] => Array
(
[pro_id] => 4
[name] => cat
)
)
)
我将首先检索类别并遍历这些类别，然后检索每个类别的产品。 像这样：
$result = Array();
$sql = "SELECT * FROM category ORDER BY category_name";
// db query here (however you are doing that)
foreach ($categories as $category)
{
$result[$category['category_name']] = Array();
$sql = "SELECT * FROM product WHERE category_id = $category[cat_id] ORDER BY product_name";
// db query here (however you are doing that)
foreach ($products as $product)
$result[$category['category_name']][$product['pro_id']] = $product['product_name'];
}
这将为您提供如下输出：
Array(
'fruits' => Array(
1 => 'mango',
3 => 'apple',
)
etc.
如果您需要保留类别 ID 等，请根据需要进行调整。