如何根据特定键(本例中为日期)的值对内部数组中的数组元素进行分组 - How to group array elements in inner arrays based on a value from specific key(date in this case)?

How to group array elements in inner arrays based on a value from specific key(date in this case)?

我有一个名为$events的关联数组，如下所示(以下是print_r($events);的输出):

注意:实际数组的大小非常大。出于演示的目的，我从中选取了一些元素。

Array
(
    [0] => Array
        (
            [group_name] => 
            [event_id] => 201
            [module_id] => event
            [user_id] => 991
            [title] => Zenda Vandan
            [location] => Satara, Maharashtra, India
            [country_iso] => MS
            [country_child_id] => 0
            [postal_code] => 
            [city] => 
            [time_stamp] => 1428315119 // 6 April 2015
        )
    [1] => Array
        (
            [group_name] => 
            [event_id] => 235
            [module_id] => event
            [user_id] => 901
            [title] => Bootstrap Feed Page
            [location] => Pune, Maharashtra, India
            [country_iso] => MS
            [country_child_id] => 0
            [postal_code] => 
            [city] => 
            [time_stamp] => 1436856285 // 14 July 2015
        )
    [2] => Array
        (
            [rsvp_id] => 0
            [event_id] => 236
            [module_id] => event
            [user_id] => 901
            [title] => Multiple Events
            [location] => Pune, Maharashtra, India
            [country_iso] => MS
            [country_child_id] => 0
            [postal_code] => 
            [city] => 
            [time_stamp] => 1436856356 // 14 July 2015
         )
     [3] => Array
        (
            [rsvp_id] => 0
            [event_id] => 237
            [module_id] => event
            [user_id] => 901
            [title] => Many Events
            [location] => Sangli, Maharashtra, India
            [country_iso] => MS
            [country_child_id] => 0
            [postal_code] => 
            [city] => 
            [time_stamp] => 1436856356 // 14 July 2015
         )
)

我想分组所有数组元素的日期明智，即从时间戳值的事件在同一日期应该分组在一起。下面应该是上述情况下所需的结果数组。

我应该如何以最优的方式得到它?

非常直接…

$result = [];
foreach($events as $event){
    //I included year in the date format so you years dont all end up in the same sub array
    $result[date('d M, l Y',$event['time_stamp'])][]=$event;
}
print_r($result);