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,
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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:
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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:
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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服务器之家网站的支持!
原文链接:http://www.cnblogs.com/bluebirds/archive/2016/12/09/6149029.html