How to display only 3 main categories, separated by commas, since they are marked in the post?

by Omniatom   Last Updated February 27, 2019 19:08 PM

I want to display only 3 categories (Ex: horses, dogs, birds), names only and comma separated, in my Post, since one of them, two or all tree are marked in the post.

    <span><?php
if ( 'in_category('horses') ) {
    echo "horses";
} ?></span><span><?php
if ( in_category('dogs') ) {
    echo "dogs";
} ?></span><span><?php
if ( in_category('birds') ) {
    echo "birds";
} 
?></span>


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