<?php
's1','s2','s3','s4','d1','d2','d3','d4','t1','t2','t3','t4'
);
$n = 0;
echo '<div>';
foreach($array as $item ) {
if( $n%4 === 0 && $n !== 0 ) {
echo '</div><div>';
}
echo $item . ' ';
$n++;
}
echo '</div>';
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