How to target thumbnails of the first post in the loop

You can get first post class similarly as you are adding last post class.

In last post case, you were checking if current_post number is equal to post_count. But in this case when we want to get first post, we will check if current_post number in loop is equal to 0 or not.

<?php $extraFirstClass = $loop->current_post == '0' ? ' main-image-porfolio-main' : ''; ?>

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