php - 如何匹配数组键并将值插入新数组？

Question

我有一个称为$transaction_count如下的数组：

Array
(
    [0] => Array
        (
            [transaction_status] => success
            [StatusCount] => 25
        )

    [1] => Array
        (
            [transaction_status] => inprocess
            [StatusCount] => 5
        )

    [2] => Array
        (
            [transaction_status] => cancelled
            [StatusCount] => 66
        )
    [3] => Array
        (
            [transaction_status] => fail
            [StatusCount] => 0
        )    
)

上面的数组是动态生成的，因此可以根据触发的查询更改数组键 ie0、1、2、3。也就是说，数组也可以采用以下形式或任何其他形式：

Array
    (

        [0] => Array
            (
                [transaction_status] => inprocess
                [StatusCount] => 5
            )


        [1] => Array
            (
                [transaction_status] => fail
                [StatusCount] => 0
            )    
    )

现在我想根据一个条件设置以下四个变量值。

$success_transaction_count, $inprocess_transaction_count, $cancelled_transaction_count, $failed_transaction_count

例如，如果数组$transaction_count如下：

Array
        (

        [0] => Array
            (
                [transaction_status] => fail
                [StatusCount] => 10

            )


        [1] => Array
            (
               [transaction_status] => cancelled
               [StatusCount] => 25
            )    
    )

因此，在上述情况下，值应设置如下：

$failed_transaction_count = 10

$cancelled_transaction_count = 25

由于不存在匹配键，因此不应设置其他两个变量。

我应该如何正确设置变量的值？

Answer 1

如果我正确理解了您想要的内容，这可能会起作用：

$transaction_count = array(
    array ("transaction_status" => "failed", "StatusCount" => 10),
    array ("transaction_status" => "cancelled", "StatusCount" => 25));

function set_counts ($input)
{
    foreach ($input as $pair)
    {
        // get back count for a given type
        $type = $pair["transaction_status"];
        $count = $pair["StatusCount"];

        // set the corresponding variable
        $var_name = $type."_transaction_count";
        global $$var_name;
        $$var_name = $count;
    }
}

set_counts ($transaction_count);

foreach (array("success", "inprocess",  "cancelled",  "failed") as $type)
{
    $var_name = $type."_transaction_count";
    $value = isset($$var_name) ? $$var_name : "not set";
    echo "$var_name: $value<br>";
}

输出：

success_transaction_count: not set
inprocess_transaction_count: not set
cancelled_transaction_count: 25
failed_transaction_count: 10

请注意，我宁愿设置所有状态计数（即未明确计数的那些设置为 0 而不是未定义），但我想你有你的理由。

Answer 2

尝试这个

$success_transaction_count=0;
$inprocess_transaction_count=0;
$cancelled_transaction_count=0;
$failed_transaction_count=0;

foreach($$transaction_count as $arr)
{
    if($arr['transaction_status']=='success')
    {
        $success_transaction_count += $arr['StatusCount'];
    }
    else if($arr['transaction_status']=='inprocess')
    {
        $inprocess_transaction_count += $arr['StatusCount'];
    }
    else if($arr['transaction_status']=='cancelled')
    {
        $cancelled_transaction_count += $arr['StatusCount'];
    }
    else if($arr['transaction_status']=='fail')
    {
        $failed_transaction_count += $arr['StatusCount'];
    }
}