Filter multidimension array with conditional logic

Question

I have below array,

Array ( [0] => Array ( [location] => X33 [usernumber] => 1 [order] => XX [part_number] => Hi ) [1] => Array ( [location] => X33 [usernumber] => 1 [order] => XX [part_number] => 68730 ) [2] => Array ( [location] => W33 [usernumber] => 2 [order] => YY [part_number] => 68741) [3] => Array ( [location] => W33 [usernumber] => 2 [order] => YY [part_number] => Hello )

I want to filter this array with usernumber = 1, by this it will create 1 array with arrays which have usernumber = 1, similarly it will create for usernumber=2

I had users in DB and will search user in this array,

I tried below code,

$users = $this->admin_model->get_usersforshipment();
foreach ($users as $user) {

  $filtered = array_filter($csv_array, function($user)

   { //Below is retrurning as orignal $csv_array, not filtered,
    return !empty($user['usernumber']); 

  });

}

Desired output, when $users['usernumber] == 1

Array ( [0] => Array ( [location] => X33 [usernumber] => 1 [order] => XX [part_number] => Hi ) [1] => Array ( [location] => X33 [usernumber] => 1 [order] => XX [part_number] => 68730 ) )

Desired output, when $users['usernumber] == 2

Array ( [0] => Array ( [location] => W33 [usernumber] => 2 [order] => YY [part_number] => 68741) [1] => Array ( [location] => W33 [usernumber] => 2 [order] => YY [part_number] => Hello ) 

How can i filter only 2 arrays from Multi Dimension array?

Answer 1

Online Example, Description added after your feedback.

$arr = array(
        array ('location' => 'X33',
               'usernumber' => 1,
               'order' => 'XX', 
               'part_number' => 'Hi'
              ),
        array ('location' => 'X33',
               'usernumber' => 1,
               'order' => 'XX',
               'part_number' => '68730' 
               ),
        array ('location' => 'W33',
               'usernumber' => 2,
               'order' => 'YY',
               'part_number' => '68741'
               ),
        array ('location' => 'W33',
               'usernumber' => 2,
               'order' => 'YY',
               'part_number' => 'Hello'
              )
    );

$out = array();
$index = $arr[0]['usernumber'];
foreach($arr as $val){
    if($index != $val['usernumber'])
        $index = $val['usernumber'];
    $out[$index][] = $val;
}
echo '<pre>';
print_r($out);