obtener el contenido por id del post

gistfile1.phtml

<div class="post-resume">
<?php 

	$my_postid = get_the_ID();//This is page id or post id
	$content_post = get_post($my_postid);
	$content = $content_post->post_content;
	$content = apply_filters('the_content', $content);
	$content = str_replace(']]>', ']]&gt;', $content);
	echo wp_trim_words( $content, 40, '<a href="'. get_permalink() .'"> ...Read More</a>' );
?>
</div>