Question

任何人都知道如何动态地获得$ initial_array $ wanted_array？谢谢！

// $initial_array

Array
(
[0] => Array
    (
        [thingy] => 4
        [date] => 27/11/2013
    )

[1] => Array
    (
        [thingy] => 4
        [date] => 27/11/2013
    )

[2] => Array
    (
        [thingy] => 2
        [date] => 27/11/2015
    )

[3] => Array
    (
        [thingy] => 2
        [date] => 27/11/2015
    )

[4] => Array
    (
        [thingy] => 2
        [date] => 27/11/2015
    )
)

// $wanted_array
// The quantity key will count instances that array item in $initial_array

Array
(
[0] => Array
    (
        [thingy] => 4
        [date] => 27/11/2013
        [quantity] = 2
    )
[1] => Array
    (
        [thingy] => 2
        [date] => 27/11/2015
        [quantity] = 3
    )

Answer 1

我把它分解为两步。

根据日期排列数据并将结果存储在$ result变量中。

$result   = array();
foreach($array as $arr) {
   $result[$arr['date']][] =  $arr;
}

这给出了：

  Array
   (
     [27/11/2013] => Array
      (
        [0] => Array
            (
                [thingy] => 4
                [date] => 27/11/2013
            )

        [1] => Array
            (
                [thingy] => 4
                [date] => 27/11/2013
            )

    )

[27/11/2015] => Array
    (
        [0] => Array
            (
                [thingy] => 2
                [date] => 27/11/2015
            )

        [1] => Array
            (
                [thingy] => 2
                [date] => 27/11/2015
            )

        [2] => Array
            (
                [thingy] => 2
                [date] => 27/11/2015
            )

    )

   )

循环遍历数组并根据我们的需要对其进行格式化。请注意，子数组长度表示数量。

foreach($result as $res) {
   $final[] = array_merge(
      current($res), 
      array("quantity" => count($res))
   );
 }

输出：

Array
(
  [0] => Array
    (
        [thingy] => 4
        [date] => 27/11/2013
        [quantity] => 2
    )

[1] => Array
    (
        [thingy] => 2
        [date] => 27/11/2015
        [quantity] => 3
    )

)

数组唯一并计入多维ararys

1 个答案: