sort array base on its object value tha contains timestamp

first I query 2 different queries.

$first = first::where('id',$request->first_id)->select('name','created_at')->get();
$second = second::where('id', $request->second_id)->select('name','created_at')->get();

and then merge the two arrays

$data_combine = array_merge($first->toArray(), $second->toArray());

Now, I want to sort ascending the combine array base on there 'created_at' value, e.g '2016-05-06 16:43:46'. Any help, ideas, clues, recommendation, suggestions please?

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