从数组中获取唯一值

I currently have an array that looks like the one below but I only want to display show results in the array from which are unique (description), I presume with array_unique? but I keep getting the same results?

Here is my array:

$taglist = array(5) { 
[0]=> array(5) { 
    ["id"]=> string(2) "27" 
    ["page_id"]=> string(2) "18" 
    ["description"]=> string(10) "Web Design" 
    ["slug"]=> string(10) "web-design" 
    ["visibility"]=> string(7) "visible"
} 
[1]=> array(5) { 
    ["id"]=> string(2) "29" 
    ["page_id"]=> string(2) "18" 
    ["description"]=> string(3) "Tutorials" 
    ["slug"]=> string(3) "tutorials" 
    ["visibility"]=> string(7) "visible"
}
[2]=> array(5) {
    ["id"]=> string(2) "31"
    ["page_id"]=> string(2) "21"
    ["description"]=> string(3) "tag" 
    ["slug"]=> string(3) "tag"
    ["visibility"]=> string(7) "visible"
}
[3]=> array(5) { 
    ["id"]=> string(2) "32" 
    ["page_id"]=> string(2) "21" 
    ["description"]=> string(10) "Web Design" 
    ["slug"]=> string(10) "web-design" 
    ["visibility"]=> string(7) "visible"
}
}

Here is my while:

$items      = array();
$results    = $taglist;

foreach ($results as $result)
{
$items[]= $result['description'];
$items  = array_unique($items);
}

echo '<ul>';
while ($tag_item = current($items))
{
echo '<li><a href="/'.$page['slug'].'/tag/'.$tag_item['slug'].'/">'.$tag_item['description'].'</a></li>';
    next($items);
}
echo '</ul>';