Online PHP editor | output for REn2f

<?php $_rows = array(); $_sub_categories = array(); for($i = 1; $i <= 28; $i++) { if(in_array($i, array(1,2))) { $_rows['row1'][] = 'Category '.$i; } if(in_array($i, array(3,4,5))) { $_rows['row2'][] = 'Category '.$i; } if(in_array($i, array(6,7,8))) { $_rows['row3'][] = 'Category '.$i; } if(in_array($i, array(9,10,11))) { $_rows['row4'][] = 'Category '.$i; } if(in_array($i, array(12,13))) { $_rows['row5'][] = 'Category '.$i; } if(in_array($i, array(14,15,16))) { $_rows['row6'][] = 'Category '.$i; } if(in_array($i, array(17,18,19))) { $_rows['row7'][] = 'Category '.$i; } if(in_array($i, array(20,21,22))) { $_rows['row8'][] = 'Category '.$i; } if(in_array($i, array(23,24,25))) { $_rows['row9'][] = 'Category '.$i; } if(in_array($i, array(26,27,28))) { $_rows['row10'][] = 'Category '.$i; } } foreach($_rows as $_row) { if(in_array($_row, array('row1'))) { $_sub_categories[] = $_row; } if(in_array($_row, array('row2','row3','row4'))) { $_sub_categories[] = $_row; } if(in_array($_row, array('row5'))) { $_sub_categories[] = $_row; } if(in_array($_row, array('row6','row7','row8','row9','row10'))) { $_sub_categories[] = $_row; } } foreach($_sub_categories as $_row):?> <ul> <?php $j = 0; ?> <?php foreach($_row as $_sub_category): $j++; ?> <li <?php if($j==1) { echo 'class="first"'; } ?>><?php echo $_sub_category; ?></li> <?php endforeach; ?> </ul> <?php endforeach; ?>