Display the Featured Image after the first paragraph in WordPress

wp-post-thumbnail-after-paragraph.php

<?php get_header(); ?>
<div>
	<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
	<h1><?php the_title(); ?></h1>
	<?php
		$after_p_img = 1;
		$content = apply_filters('the_content', $post->post_content);
		if(substr_count($content, '<p>') > $after_p_img){
			$contents = explode("</p>", $content);
			$p_count = 1;
			foreach($contents as $content){
				echo $content;
				if($p_count == $after_p_img){
					if ( has_post_thumbnail() ) {
						the_post_thumbnail();
					}
				}
				echo "</p>";
				$p_count++;
			}
		} 
	?>
	<?php the_content(); ?>
	<?php endwhile; endif; ?>
</div>
<?php get_footer(); ?>