4th.php

<?php

foreach ($somethings as $thing) {
     $count = 1;
     if ($count == 4) {
         echo "<div class='thing'>";
?>
LOTS OF HTML CONTENT HERE
</div> <!-- close div -->
<?
         $count = 1;    
     } else {
         echo "<div>";
?>
LOTS OF HTML CONTENT HERE
</div> <!-- close div -->
<?
     }
     $count++;
}
?>