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]][] = $value;}// Recursively build a nested grouping if more parameters are supplied// Each grouped array value is grouped according to the next sequential keyif (func_num_args() > 2) {$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错新站长站网站的支持!
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