# Related Posts Below Single Posts

> Lists three posts from the same categories at the end of each single post. No plugin, no extra database tables.

- Type: PHP
- Runs: Frontend only
- Category: [Content](https://wpide.com/library/category/content/)
- Tags: content, related-posts, engagement
- Author: WPIDE Team
- Installs: 0
- Updated: 2026-10-28
- Page: https://wpide.com/library/related-posts-after-content/

## Code

```php
add_filter( 'the_content', function ( $content ) {
    if ( ! is_singular( 'post' ) || ! in_the_loop() || ! is_main_query() ) {
        return $content;
    }

    $post_id    = get_the_ID();
    $categories = wp_get_post_categories( $post_id );

    if ( ! $categories ) {
        return $content;
    }

    $related = get_posts( array(
        'category__in'        => $categories,
        'post__not_in'        => array( $post_id ),
        'numberposts'         => 3,
        'ignore_sticky_posts' => true,
        'no_found_rows'       => true,
    ) );

    if ( ! $related ) {
        return $content;
    }

    $html = '<aside class="wpide-related-posts"><h3>Related posts</h3><ul>';

    foreach ( $related as $item ) {
        $html .= '<li><a href="' . esc_url( get_permalink( $item ) ) . '">' . esc_html( get_the_title( $item ) ) . '</a></li>';
    }

    return $content . $html . '</ul></aside>';
}, 20 );
```

## Notes

Change numberposts to show more or fewer posts.

## How to use it

Install the free WPIDE plugin (https://wordpress.org/plugins/wpide/), find "Related Posts Below Single Posts" in its snippet library and add it in one click; or create a new PHP snippet in WPIDE (or any code snippets plugin) and paste the code above. More snippets: https://wpide.com/library/