WordPress | Comma seperated list of all categories assigned to a post without links

category-list.php

<?php
if ( has_category() ) {
    echo '<span>';
    $categories = get_the_category();
    $total = count( $categories );
    $catcount = 1;
    foreach( $categories as $category ) {
        $catname = $category->cat_name;
        echo $catname;
        if ( $catcount != $total ) {
            echo ', '; // if NOT last print a comma
        }
        $catcount++;
    } // end foreach
    echo '</span>';
} // end if has_category
?>

Just the categories assigned to a post

I rarely need to do this, but when I do it always seems a struggle to find out how.