checkboxlist垂直列

I have an array that i want to convert to a checboxlist. i know i could sort $arr3 before i pass it into checBoxList() but i was just wondering if Yii has a built in way to sort it vertically instead of horizontally?

$arr3 = array('1'=1, '2'=>2,'3'=>3,'4'=>4,'5'=>5,'6'=>6);

echo $form->checkBoxList($model,'lat', $arr3,
                                                array(
                                                      'name'=>'distance',
                                                      'separator'=>'',
                                                      'template'=>'<span class="col-md-6 col-xs-12">{input}&nbsp;{label}</span>',
                                                      'uncheckValue'=>0
                                                )
                                    );

the current output looks like this

1    2
3    4
5    6

but i would like it to look like this

1    4
2    5
3    6

here is my HTML

<div class="col-md-6 col-xs-12">
        <input id="distance_0" value="1 km" name="distance[]" type="checkbox">&nbsp;<label for="distance_0">1 km</label>
</div>
<div class="col-md-6 col-xs-12">
    <input id="distance_1" value="2 km" name="distance[]" type="checkbox">&nbsp;<label for="distance_1">2 km</label>
</div>
<div class="col-md-6 col-xs-12">
    <input id="distance_2" value="3 km" name="distance[]" type="checkbox">&nbsp;
    <label for="distance_2">3 km</label>
</div>