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脚本之家网站的支持！