<?php wp_tag_cloud( array( 'format' => 'list', 'smallest' => '11','largest' => '11','unit' => 'px','number' => '12') ); ?>
<?php $tag = wp_tag_cloud( array( 'format' => 'array', 'smallest' => '11','largest' => '11','unit' => 'px','number' => '12') ); ?>
<ul>
<?php
foreach ($tag as $key => $value) {
echo "<li>$value</li>";
}
?>
</ul>