Group and order by count?

[XFFA.IR Bot]

For a table having data as the following:

user_id
2
4
1
5
6
3
1
6

I'm using the following query and grouping by user_id

PHP:

$d = \XF::finder('Asprin\FB:Foo')->fetch();
$grouped = $d->groupBy('user_id');
\XF::dump($grouped);

This is giving me the following output:
Code:

array:6 [▼
  6 => array:2 [▶]
  5 => array:1 [▶]...

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