<?php
's1','s2','s3','s4','d1','d2','d3','d4','t1','t2','t3','t4'
);
$n = 1;
foreach($array as $item ) {
$class = $n%5 === 0 || $n===1? ' class-5' : ''; ?>
<div class="class<?php echo $class?>">это ваш пост</div>
<?php $n++;
}
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