Show related post from "Related Posts for WordPress By Never5" WordPress Plugin

single.php

<?php // Show related post from "Related Posts for WordPress By Never5" WordPress Plugin

$p_id = get_the_ID();

$link_args = array(
    'post_type'      => 'rp4wp_link',
    'posts_per_page' => 6,
    'meta_query'     => array(
        array(
            'key'     => 'rp4wp_parent',
            'value'   => $p_id,
            'compare' => '=',
        )
    )
);

$wp_query = new WP_Query();
$posts = $wp_query->query( $link_args );
$child_ids = array();

foreach( $posts as $post ) {
    $child_ids[] = get_post_meta( $post->ID, 'rp4wp_child', true );
}

$args = array(
    'post__in' => $child_ids,
    'orderby' => 'post__in', 
    'posts_per_page' => 6
);

$the_query = new WP_Query( $args );

while ( $the_query->have_posts() ) {
    $the_query->the_post();
    get_template_part( 'template-parts/content', 'card' );
}

wp_reset_postdata();