<?php $articles_categories_body = R::getAll('SELECT * FROM articles_categories'); ?>

<?php foreach( $articles_categories_body as $key => $articles_categories_body_item ): ?>
<div class="container">
  <?php if ($key % 2 == 1): ?>
  <div class="row left">
    <?php
      if ($articles_categories_body_item['id'] % 2 == 0)
        {
          echo $articles_categories_body_item['title'];
        }
    ?>
  </div>
  <?php else: ?>
  <div class="row right">
    <?php
      if ($articles_categories_body_item['id'] % 2 != 0)
        {
          echo $articles_categories_body_item['title'];
        }
    ?>
  </div>
<?php endif; ?>
</div>
<?php endforeach; ?>