fetusz

i’ve just solve it, here the code:

<?php $cuenta = 1+$wp_query->current_post % 6; ?>
<article class="grid <?php if ($cuenta==3 || $cuenta==4){ echo 'rctngl'; } else { echo 'sqr'; } ?>">

The result is this:

<article class="grid sqr"></article>
<article class="grid sqr"></article>
<article class="grid rctngl"></article>
<article class="grid rctngl"></article>
<article class="grid sqr"></article>
<article class="grid sqr"></article>

and repeat…