php - 如何在 PHP 的关联数组中更新特定键的值？

Question

我有一个名为 $data 的关联数组

Array
(
    [0] => Array
        (
            [transaction_user_id] => 359691e27b23f8ef3f8e1c50315cd506
            [transaction_no] => 19500912050218
            [transaction_total_amount] => 589.00
            [transaction_date] => 1335932419
            [transaction_status] => cancelled
        )

    [1] => Array
        (
            [transaction_user_id] => 9def02e6337b888d6dbe5617a172c18d
            [transaction_no] => 36010512050819
            [transaction_total_amount] => 79.00
            [transaction_date] => 1336476696
            [transaction_status] => cancelled
        )

    [2] => Array
        (
            [transaction_user_id] => 9def02e6337b888d6dbe5617a172c18d
            [transaction_no] => 19020512050820
            [transaction_total_amount] => 299.00
            [transaction_date] => 1336476739
            [transaction_status] => cancelled
        )

    [3] => Array
        (
            [transaction_user_id] => 9def02e6337b888d6dbe5617a172c18d
            [transaction_no] => 27050512050821
            [transaction_total_amount] => 79.00
            [transaction_date] => 1336476927
            [transaction_status] => cancelled
        )

    [4] => Array
        (
            [transaction_user_id] => 8e9050a3646c98342b9ba079fba80982
            [transaction_no] => 12070512050822
            [transaction_total_amount] => 129.00
            [transaction_date] => 1336477032
            [transaction_status] => cancelled
        )

)

我想将键 [transaction_date] 的值转换为用户可读的格式(即 mm/dd/yyyy)。为此，我在返回整个数组的函数中编写了以下代码:

 foreach($data as $value)
 {
    $value[transaction_date]=date('d/m/Y',$value[transaction_date]);
 }
    
 return $data;

我的问题是我得到了相同的数组，但没有更改所有数组元素的 [transaction_date] 的值。实际上，预计会返回具有 [transaction_date] 更新值的数组。谁能帮我解决这个问题？提前致谢。

Answer 1

将您的 foreach 更改为类似的内容，在执行操作后，您不会将数据分配回返回变量 $data。

foreach($data as $key => $value)
{
  $data[$key]['transaction_date'] = date('d/m/Y',$value['transaction_date']);
}

Codepad DEMO.