php array sorting by date stdClass Object - php

Question

I have an array of something like this:
Array ( [0] => stdClass Object ( [id] => 41 [title] => test2 [alias] => test2 [catid] => 8 [published] => 1 [introtext] =>
test2
[fulltext] => [video] => [gallery] => [extra_fields] => [] [extra_fields_search] => [created] => 2012-08-27 16:37:51 [created_by] => 62 [created_by_alias] => [checked_out] => 0 [checked_out_time] => 0000-00-00 00:00:00 [modified] => 0000-00-00 00:00:00 [modified_by] => 0 [publish_up] => 2012-08-27 16:37:51 [publish_down] => 0000-00-00 00:00:00 [trash] => 0 [access] => 1 [ordering] => 15 [featured] => 0 [featured_ordering] => 0 [image_caption] => [image_credits] => [video_caption] => [video_credits] => [hits] => 0 [params] => JParameter Object ( [_raw:protected] =>
and etc in that array ( it has alot of things in it ).
Now it is displaying like this
Item | date
Item | date
Item | date
What I want to do is take that array and sort it by aggregate date
Somethink like this
Aggr date
Item | date
Item | date
Aggr date
Item | date
Item | date
Is this even possible given this array ?

Answer 1

Is this what you are looking for?
$newArray = array();
foreach ($myArrayOfStdClasses as $key => $obj) {
$newArray[date('Y-m-d', strtotime($obj->created]))[] = array('title' => $obj->tile, 'date' => $obj->created);
}

Answer 2

You can use usort to define your sorting function:
usort($items, function($item1, $item2){
if($item1->created == $item2->created)
return 0;
return $item1->created < $item2->created ? -1 : 1;
});
This will just sort them. Then on output as you loop through them you can do the aggregation based on day, hour, month however...