mfn_content_pos()t by post id code example
Example: wp get post content by id
$post_id = 5// example post id
$post_content = get_post($post_id);
$content = $post_content->post_content;
echo apply_filters('the_content',$content);
$post_id = 5// example post id
$post_content = get_post($post_id);
$content = $post_content->post_content;
echo apply_filters('the_content',$content);