To show related articles you can use the plugin Better Related Posts, Yet Another Related Posts Plugin… However, with a plugin you will not display the related articles in content professional as the photo below? This article will guide you How to add “Related posts” in content of your WordPress blog:

Step 1: Install and active the plugin Related Posts by Taxonomy

Step 2: Add the following code to the functions.php of your blog

// Code for count the number of paragraph

function count_paragraph( $insertion, $paragraph_id, $content ) {

        $closing_p = '</p>';

        $paragraphs = explode( $closing_p, $content );

        foreach ($paragraphs as $index => $paragraph) {

                if ( trim( $paragraph ) ) {

                        $paragraphs[$index] .= $closing_p;

                }

                if ( $paragraph_id == $index + 1 ) {

                        $paragraphs[$index] .= $insertion;

                }

        }

 

        return implode( '', $paragraphs );

}

// Code for insert related post in content

add_filter( 'the_content', 'prefix_insert_post_ads' );

 

function prefix_insert_post_ads( $content ) {

 

        $related_posts= do_shortcode('[related_posts_by_tax title=""]');

 

        if ( is_single() ) {

                return count_paragraph( $related_posts, 1, $content );

        }

 

        return $content;

}