PHP 根据key 给二维数组分组


            我们经常拿到一个二维数组出来，会发现结果和自己想要的有些偏差，可能需要根据二维数组里的某个字段对数组分组。

先来看以下数组，





Array

(

[0] => Array

(

[id] => 1

[wo_id] => 2

[evaluate_id] => 1

[type] => 分组1

[ctime] => 2016-12-02 11:39:34

)

[1] => Array

(

[id] => 2

[wo_id] => 31

[evaluate_id] => 2

[type] => 分组1

[ctime] => 2016-12-12 11:39:50

)

[2] => Array

(

[id] => 3

[wo_id] => 31

[evaluate_id] => 4

[type] => 分组2

[ctime] => 2016-12-02 11:40:01

)

[3] => Array

(

[id] => 4

[wo_id] => 2

[evaluate_id] => 5

[type] => 分组2

[ctime] => 2016-12-07 10:21:40

)

[4] => Array

(

[id] => 5

[wo_id] => 2

[evaluate_id] => 3

[type] => 分组2

[ctime] => 2016-12-07 10:21:51

)

[5] => Array

(

[id] => 6

[wo_id] => 2

[evaluate_id] => 2

[type] => 分组3

[ctime] => 2016-12-07 10:21:56

)

[6] => Array

(

[id] => 7

[wo_id] => 4

[evaluate_id] => 2

[type] => 分组3

[ctime] => 2016-12-07 10:22:10

)

)



这里是一个很典型的例子，如果我希望把 数组中的数据 根据 type（分组） 分开处理，如果不分组，可能循环上会非常冗余，所以有了下面的一个分组函数：





　　public static function array_group_by($arr, $key)

{

$grouped = [];

foreach ($arr as $value) {

$grouped[$value[$key]][] = $value;

}

// Recursively build a nested grouping if more parameters are supplied

// Each grouped array value is grouped according to the next sequential key

if (func_num_args() > 2) {

$args = func_get_args();

foreach ($grouped as $key => $value) {

$parms = array_merge([$value], array_slice($args, 2, func_num_args()));

$grouped[$key] = call_user_func_array('array_group_by', $parms);

}

}

return $grouped;

}



$arr : 二维数组

$key: 需要分组的key

得到的结果是：





Array

(

[分组2] => Array

(

[0] => Array

(

[id] => 1

[wo_id] => 2

[evaluate_id] => 1

[ctime] => 2016-12-02 11:39:34

[type] => 分组2

)

[1] => Array

(

[id] => 2

[wo_id] => 31

[evaluate_id] => 2

[ctime] => 2016-12-12 11:39:50

[type] => 分组2

)

[2] => Array

(

[id] => 3

[wo_id] => 31

[evaluate_id] => 4

[ctime] => 2016-12-02 11:40:01

[type] => 分组2

)

)

[分组1] => Array

(

[0] => Array

(

[id] => 4

[wo_id] => 2

[evaluate_id] => 5

[ctime] => 2016-12-07 10:21:40

[type] => 分组1

)

[1] => Array

(

[id] => 5

[wo_id] => 2

[evaluate_id] => 3

[ctime] => 2016-12-07 10:21:51

[type] => 分组1

)

)

)



以上所述是小编给大家介绍的PHP 根据key 给二维数组分组，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对中文源码网网站的支持！