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I have a page which lists all tags (artist names) for a certain category along with links to that artists work. Each post only has one tag if that helps simplify things.

I am trying to order the tags by the last name rather than the first. An example of the tag might be "Claude Monet" - but currently that is sorted as "C" rather than by "M".

The closest post with a solution is at Taxonomy terms sort by... Last name! however I can't get that to work.

Currently my code is as follows:

<?php 
$post_tags = array();
$the_query = new WP_Query( 'posts_per_page=-1&cat=28' );
if ( $the_query->have_posts() ) : 
    while ( $the_query->have_posts() ) : $the_query->the_post(); 
        $posttags = get_the_tags();
        foreach( $posttags as $posttag )  {
            $post_tags[$posttag->slug] = $posttag->name;
        }
    endwhile;
endif;
?>

<ul class="artistList" data-filter-group="tags">
    <?php  natcasesort($post_tags);
    foreach( $post_tags as $tagslug => $tagname ){ ?>
        <li><a href="<?php echo site_url(); ?>/for-sale/<?php echo $tagslug;?>" data-filter-value="<?php echo     $tagslug;?>"><?php echo $tagname;?></a></li>
    <?php } ?>    
</ul>

I am not very skilled with this stuff. From the previously linked taxonomy article it seems like I could make a filter in the functions file to ensure a sort by last word (wpse_last_word) and then use the array sort, but I am stumped at actually executing if that is indeed a valid solution.

Where am I going wrong?

Thanks much in advance

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