PHP groups two-dimensional arrays according to key

We often get a two-dimensional array, we will find that the result and we want some deviation, may need to be based on a two-dimensional array of a field in the group grouping.

First look at the following array,

Array ([0] = = Array ([id] = 1[wo_id] = 2[evaluate_id] = 1[type] + Group 1[ctime] = 2016-12-02 11:39:34) [1  ] = = Array ([id] = 2[wo_id] = 31[evaluate_id] = 2[type] + Group 1[ctime] = 2016-12-12 11:39:50) [2] = = Array ([id] = 3[wo_id] = 31[evaluate_id] = 4[type] = Group 2[ctime] = 2016-12-02 11:40:01) [3] = = Array ( [ID] [4[wo_id] = 2[evaluate_id] = 5[type] + Group 2[ctime] = 2016-12-07 10:21:40) [4] = = Array ([id] =&G T  5[WO_ID] [= 2[evaluate_id] = 3[type] = Group 2[ctime] = = 2016-12-07 10:21:51) [5] = = Array ([id] + 6[wo_id] = 2[evaluate_id] = 2[type] + Group 3[ctime] = 2016-12-07 10:21:56) [6] = = Array ([id] = 7[wo_id] + 4 [evaluate_id] = 2[type] + group 3[ctime] (2016-12-07-10:22:10))

Here is a very typical example, if I want the data in the array to be separated according to the type (grouping), if not grouped, may be very redundant loop, so the following a grouping function:

public static function Array_group_by ($arr, $key) {$grouped = [];foreach ($arr as $value) {$grouped [$value [$key]][] = $valu e;} Recursively build a nested grouping if more parameters be supplied//each grouped array value was grouped according to The next sequential Keyif (Func_num_args () > 2) {$args = Func_get_args (); foreach ($grouped as $key = = $value) {$parm s = Array_merge ([$value], Array_slice ($args, 2, Func_num_args ())); $grouped [$key] = Call_user_func_array (' Array_group_ By ', $parms);}} return $grouped;}

$arr: two-dimensional array

$key: Key that needs to be grouped

The resulting results are:

Array ([group 2] = = Array ([0] = = Array ([id] = 1[wo_id] = 2[evaluate_id] = 1[ctime] = 2016-12-02 11:39:34[ Type] = + Group 2) [1] = = Array ([id] = 2[wo_id] = 31[evaluate_id] = 2[ctime] = 2016-12-12 11:39:50[type] = > Group 2) [2] = = Array ([id] = 3[wo_id] = 31[evaluate_id] = 4[ctime] = 2016-12-02 11:40:01[type] = Group 2)) [Group 1] = = Array ([0] = = Array ([id] = 4[wo_id] = 2[evaluate_id] = 5[ctime] = 2016-12-07 10:21:40[typ  E] + = group 1) [1] = = Array ([id] = 5[wo_id] [2[evaluate_id] = 3[ctime] = 2016-12-07 10:21:51[type] = Group 1)))

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