WordPress: related posts by tags

relatedTags.php

<?php 
	$tags = wp_get_post_tags($post->ID);
	if ($tags) { ?>

	<div class="related-posts">
			
	<?php

		$first_tag = $tags[0]->term_id;
		$tagsIDs = array();

		foreach ($tags as $tag):

			$tagIDs[] = $tag->term_id;

		endforeach;

		$args=array(
			'tag__in' => $tagIDs,
			'post__not_in' => array($post->ID),
			'posts_per_page'=> 4,
		);
		$my_query = new WP_Query($args);
		if( $my_query->have_posts() ) {
			while ($my_query->have_posts()) : $my_query->the_post();

			if (has_post_thumbnail()) {
				$thumb_id = get_post_thumbnail_id();
				$thumb_url_array = wp_get_attachment_image_src($thumb_id, 'blog-element', true);
				$thumb_url = $thumb_url_array[0];
				$class = '';
			} else {
				$thumb_url = '';
				$class = 'no-image';
			}
		?>
			<div class="blog-element <?php echo $class; ?>" style="background-image: url(<?php echo $thumb_url; ?>);">
				<a class="back-drop" href="<?php the_permalink() ?>" title="Link to <?php the_title_attribute(); ?>">
					<h4><?php the_title(); ?></h4>

					<div class="meta">
						<p class="date"><?php the_time('j F, Y'); ?></p>
						<?php
							if(in_category('inspiring')) {
								echo "<p class='category'><span>all.</span>inspiring</p>";
							} elseif(in_category('news')) {
								echo "<p class='category'><span>all.</span>news</p>";
							}
						?>
					</div>
				</a>
			</div>
		<?php


			endwhile;
		} ?>

</div>