Decide Columns

<?php $loop = 0; ?>
<?php while(have_posts()): the_post(); ?>
    <?php $loop++; ?>
    <div class="<?php echo decideCols($loop); ?>">
        <?php the_title(); ?>
        <?php the_content(); ?>
    </div>
<?php endwhile; ?>

<?php
function decideCols($loop){
    switch($loop):
        case 1:
            return 'col-md-4';
            break;
        case 2:
            return 'col-md-8';
            break;
        case 3:
            return 'col-md-4';
            break;
        default:
            return 'col-md-whatever';
            break;
    endswitch;
}