如何在PHP关联数组更新特定键的值？ [英] How to update specific key's value in an associative array in PHP?

问题描述

我有一个名为以下关联数组 $数据

I've a following associative array named $data

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
        )

)

和我想关键 [TRANSACTION_DATE] 的值转换为用户可读的格式（即MM / DD / YYYY）。为此，我写了下面的code在返回整个数组的函数：

and I want to convert the value of key [transaction_date] into user readable format (i.e. mm/dd/yyyy). For that I written the following code in a function which returns the whole array:

 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阵列，而不改变 [TRANSACTION_DATE] 的价值为所有的数组元素。使用更新的值其实阵列 [TRANSACTION_DATE] 预计将被退回。
谁能帮我解决这个问题？先谢谢了。

My problem is I'm getting the same array without changing the value of [transaction_date] for all the array elements. Actually array with updated values for [transaction_date] is expected to be returned. Can anyone help me out to resolve this issue? Thanks in advance.

推荐答案

您的foreach更改为这样的事情，你是不是分配的数据传回返回变量 $数据上执行操作之后。

Change your foreach to something like this, You are not assigning data back to your return variable $data after performing operation on that.

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

codePAD DEMO。

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