Add multiple classes name to post thumbnail in Wordpress

Question

this is a wordpress problem. I know I can add a class to a wordpress featured image via this:

<?php the_post_thumbnail('post-thumbnail', ['class' => 'img-responsive']); ?>

However how do I add multiple? I tried using an array but it just displays array in inspecter and I am not sure if it worked. Please help. Thanks.

Answer 1

You could try it simply like this:

<?php the_post_thumbnail('post-thumbnail', ['class' => 'img-responsive my-other-class']); ?>