私は配列を持っています:
Array
(
[0] => Array
(
[id] => 81
[placed] => 2013-09-19 16:32:53
[sub_total] => 786
)
[1] => Array
(
[id] => 80
[placed] => 2013-09-19 16:32:06
[sub_total] => 780
)
[2] => Array
(
[id] => 79
[placed] => 2013-09-18 17:06:48
[sub_total] => 786
)
[3] => Array
(
[id] => 78
[placed] => 2013-09-18 17:05:02
[sub_total] => 756
)
[4] => Array
(
[id] => 77
[placed] => 2013-09-17 17:02:53
[sub_total] => 786
)
[5] => Array
(
[id] => 76
[placed] => 2013-09-16 17:02:53
[sub_total] => 756
)
)
このデータを日付別にグループ化し、小計を集計して出力配列を取得することは可能ですか:
Array
(
[0] => Array
(
[placed] => 2013-09-19
[sub_total] => 786 + 780
)
[2] => Array
(
[placed] => 2013-09-18
[sub_total] => 786 + 756
)
[3] => Array
(
[placed] => 2013-09-17 17:02:53
[sub_total] => 786
)
[4] => Array
(
[placed] => 2013-09-16 17:02:53
[sub_total] => 756
)
)