Using Parents Page Thumbnail URL

  • I’m using this code to grab the url of the thumbnail to insert it as a background image.

    <?php $thumb = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full' );?>
<div class='divName' style='background-image: url(<?php echo $thumb['0']; ?>);'>

    How do I add to this code to work like his:

    If parent > insert thumbnail URL.
    If child of parent has NO thumbnail > insert parent thumbnail URL.
    If child of parent has thumbnail > insert thumbnail URL.

    I’m sorta new to WP so I’m not sure how to go about doing this.

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