如何在PHP中访问特定的键->值对并从关联数组中排除特定的键->值对？

Question

我有一个名为$_SESSION[BASE_SESSION_NAME]['my_cart']的关联数组。作为参考，我按如下方式打印数组：

Array
(
    [6f993b72511c37f4ab4d7273066b8160] => Array
        (
            [pack_id] => 6f993b72511c37f4ab4d7273066b8160
            [pack_type] => test
            [pack_type_id] => 4
            [pack_name] => NEET XII Biology
            [pack_price] => 459.00
            [pack_validity] => Array
                (
                    [years] => 1
                    [months] => 0
                    [days] => 0
                )

        )

    [cart_summary] => Array
        (
            [total_no_packages] => 3
            [total_pack_price] => 1557
            [final_total_pack_price] => 1557
            [total_pack_discount] => 0
            [apply_deal_code] => 0
            [no_of_discounted_packages] => 0
        )

    [67f76ffae26ffdcde7a392c5534c972a] => Array
        (
            [pack_id] => 67f76ffae26ffdcde7a392c5534c972a
            [pack_type] => test
            [pack_type_id] => 4
            [pack_name] => NEET XII Chemistry
            [pack_price] => 599.00
            [pack_validity] => Array
                (
                    [years] => 1
                    [months] => 0
                    [days] => 0
                )

        )

    [31dc7c5d9b9cb5a2ba968e74efd4a475] => Array
        (
            [pack_id] => 31dc7c5d9b9cb5a2ba968e74efd4a475
            [pack_type] => test
            [pack_type_id] => 4
            [pack_name] => NEET XII Physics
            [pack_price] => 499.00
            [pack_validity] => Array
                (
                    [years] => 1
                    [months] => 0
                    [days] => 0
                )

        )

)

现在，我只想访问具有pack_id值或值为ok的键pack_id。例如，值31dc7c5d9b9cb5a2ba68e74efd4a475或来自i.e.for pack_id的值[pack_id] => 31dc7c5d9b9cb5a2ba968e74efd4a475。但问题是，还有一个数组具有键[cart_summary]，我不想使用该数组中的任何内容。我必须在每一个这样的pack_id上触发一个查询。所以我想在循环的帮助下触发一个查询。有人能帮我解决这个问题吗？提前谢谢。我想使用的查询如下：

SELECT package_type.package_type_name
FROM package_type
JOIN test_packages ON package_type.package_type_id = test_packages.test_pack_type_id
WHERE test_packages.test_pack_id = '$propsed_pack_id'

Answer 1

下面是您在注释中请求的关联数组的foreach

$mycart = $_SESSION[BASE_SESSION_NAME]['my_cart'];// where $mycart is the array structure
                                                  //as shown above in the question
foreach($mycart as $key=>$value)
{
     //where $key holds the pack_id i.e. the array key value
     $propsed_pack_id = $value['pack_id'];
     if($key != "cart_summary")
     {
         //execute you sql query
         $query = "SELECT package_type.package_type_name
         FROM package_type
         JOIN test_packages ON package_type.package_type_id =    
         test_packages.test_pack_type_id
         WHERE test_packages.test_pack_id = '$propsed_pack_id'";
         ......

     }
 }

我希望这能对你有所帮助。

Answer 2

unset($arr["item"])从名为$arr的数组中删除键为" item“的项。

Answer 3

一种方法是您可以直接检查'cart-summary‘，正如saran banerjee所说的那样。

但是我建议，你可以在数组中检查'pack_id‘键，而不是硬编码检查'cart-summary’。如果存在，则对该pack_id执行查询，否则不执行。

$mycart = $_SESSION[BASE_SESSION_NAME]['my_cart']; 

foreach($mycart as $key=>$value)
{
     //where $key holds the pack_id 
     $propsed_pack_id = isset($value['pack_id']) ? $value['pack_id'] : '';
     if($propsed_pack_id != "")
     {
         //execute you sql query
         $query = "SELECT package_type.package_type_name
         FROM package_type
         JOIN test_packages ON package_type.package_type_id =    
         test_packages.test_pack_type_id
         WHERE test_packages.test_pack_id = '$propsed_pack_id'";

     }
 }