Adds "Get thumb and title from related" callback into available callbacks list in Dynamic Field widget

jet-engine-thumbnail-title-from-related-callback.php

<?php

/**
 * Add "Get thumb and title from related" callback into available callbacks list
 */
function jet_add_rel_callback( $callbacks ) {
	$callbacks['jet_rel_thumb_callback'] = 'Get thumb and title from related';
	return $callbacks;
}

/**
 * Return thumbnail and post title for pased related posts list
 */
function jet_rel_thumb_callback( $posts ) {

	if ( empty( $posts ) ) {
		return;
	}

	$result = '';

	foreach ( $posts as $post_id ) {

		if ( ! has_post_thumbnail( $post_id ) ) {
			continue;
		}

		$result .= '<div class="rel-post-wrap">';
		$result .= get_the_post_thumbnail( $post_id, 'full', array( 'alt' => get_the_title( $post_id ) ) );
		$result .= '<div class="rel-post-title">' . get_the_title( $post_id ) . '</div>';
		$result .= '</div>';
	}

	return $result;

}