PHP怎么实现根据数组的值进行分组

PHP实现根据数组的值进行分组的方法

Array(
                    [0] => Array
                        (
                            [title] => 新闻投票分成
                            [gold] => +0.004095
                            [create_time] => 1545355432
                            [create_date] => 20181221
                        )
 
                    [1] => Array
                        (
                            [title] => 新闻投票分成
                            [gold] => +0.002801
                            [create_time] => 1545355432
                            [create_date] => 20181221
                        )
 
                    [2] => Array
                        (
                            [title] => 持币分红
                            [gold] => +0.837871
                            [create_time] => 1545194334
                            [create_date] => 20181219
                        )
 
                )

从数据库得到的数据，想根据日期进行分组

  $list = array();
            foreach($gold as $key=>$val){
                $val['create_time'] = date('Y-m-d H:i:s',$val['create_time']);
                $list[$val['create_date']]['time'] = $val['create_date'];
                $list[$val['create_date']]['data'][] = $val;
 
            }
        
            $ret = array();
          
            foreach ($list as $key => $value) {
              array_push($ret, $value);
            }

将得到 的数组循环分组，得到数据

Array
(
    [0] => Array
        (
            [time] => 20181221
            [data] => Array
                (
                    [0] => Array
                        (
                            [title] => 新闻投票分成
                            [gold] => +0.004095
                            [create_time] => 2018-12-21 09:23:52
                            [create_date] => 20181221
                        )
 
                    [1] => Array
                        (
                            [title] => 新闻投票分成
                            [gold] => +0.002801
                            [create_time] => 2018-12-21 09:23:52
                            [create_date] => 20181221
                        )
 
                    [2] => Array
                        (
                            [title] => 新闻投票分成
                            [gold] => +0.002069
                            [create_time] => 2018-12-21 09:23:52
                            [create_date] => 20181221
                        )
                )
 
        )
 
    [1] => Array
        (
            [time] => 20181219
            [data] => Array
                (
                    [0] => Array
                        (
                            [title] => 持币分红
                            [gold] => +0.837871
                            [create_time] => 2018-12-19 12:38:54
                            [create_date] => 20181219
                        )
 
                )
 
        )
 
)

实现根据时间分组，重点在循环的时候定义的类型。

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