<?php foreach($products as $product) : ?>

<li><a href="<?php echo base_url(); ?>main/products/<?php echo $product->id; ?>">
<?php echo $product->name; ?> </a></li>

<?php endforeach; ?>

<ul> on every 20 records</ul>

<?php
 *$i = 0;*
 echo "<ul>";
 foreach($products as $product) :
 if($i % 20 == 0) echo "</ul><ul>";
?>
<li><a href="<?php echo base_url(); ?>main/products/<?php echo $product->id; ?>">
<?php echo $product->name; ?> </a></li>
<?php
 //if($i % 20 == 0) echo "</ul>";
 $i += 1;
 endforeach;
 echo "</ul>";
 ?>

<?php $products = array('1','2','3','4','5','6','8', 9, 10, 11, 12);?>
<?php $count = 0?>
<?php foreach($products as $product) : ?>
<?php $count = $count + 1; ?>
<?= (($count == 5) ? "<ul>" : '' )?>
<li><a href="<?php echo base_url(); ?>main/products/"></a></li>

<?= (($count == 5) ? "</ul>" : '')?>
<?php (($count == 5) ? $count = 0 : '' )?>
<?php endforeach; ?>

<?php
     $i = 1;
     echo "<ul>";
     foreach($products as $product) :
     if($i % 20 == 0) echo "</ul><ul>";
    ?>
    <li><a href="<?php echo base_url(); ?>main/products/<?php echo $product->id; ?>">
    <?php echo $product->name; ?> </a></li>
    <?php
     $i += 1;
      endforeach; echo "</ul>"; ?>