Displaying internal linkbacks on WordPress

I have written a lot of blog posts. In some of those posts I link to other posts on my site. What's the easiest way of displaying those internal incoming links?

Here's what it looks like:

Code

All we need to do is search WordPress for the URl of the current page. Loop through the results. Then display those links.

 PHP$the_query = new WP_Query(
    array(
        's' => get_the_permalink(), // This post
        'post_type' => 'post',      // Only posts, not pages
        "posts_per_page" => "-1",   // Get all results
        "order" => "ASC"            // Oldest first
    )
);

//  Nothing to do if there are no inbound links
if ( !$the_query->have_posts() ) {
    return;
}

//  Loop through the posts
while ( $the_query->have_posts() ) {
    //  Set it up
    $the_query->the_post();
    $id            = get_the_ID();
    $title         = esc_html( get_the_title() );
    $url           = get_the_permalink();
    $comment_date  = get_the_date( "c" );
    $comment_year  = get_the_date( "Y" );

    //  Get the thumbnail
    if ( has_post_thumbnail( $id) ) {
        $thumb = get_the_post_thumbnail( $rid, 'full', 
            array( "class"   => "related-post-img",
                   "loading" => "lazy" //   Lazy loading and other attributes
            ) 
        );
    } else {
        $thumb = null;
    }

    //  Create the HTML for the incoming link
    echo <<<color: #795E26;">EOT
    <li>
        <a href="$url">
            $thumb
            $title
        </a>
        <time datetime="$comment_date">$comment_year</time>
    </li>
    color: #795E26;">EOT;

}

In order to reduce duplicates, you may also want to disable self-ping. Here's some code you can stick in your functions.php:

 PHPfunction no_self_ping( &$links ) {

    $home = esc_url( home_url() );

    // Process each link in the content and remove if it matches the current site URL
    foreach ( $links as $l => $link ) {
        if ( 0 === strpos( $link, $home ) ) {
            unset( $links[ $l ] );
        }
    }
}
add_action( 'pre_ping', 'no_self_ping' );