I'm trying to display related posts on my taxonomy page, but not sure how to work out the second loop. I have shared taxonomys among posts, and on this page it shows post type A with tags "Light".

Some of the posts with tags "Light" are NOT post type A. So I have the following:

<?php $related = array(); ?>
<?php while (have_posts()) : the_post(); ?>
    <?php if(get_post_type() == 'Type_B' || get_post_type() == 'Type_C'){
        array_push($related, $post);
    } ?>
<?php endwhile; ?>

This works fine. But then later down on the page where I want to loop type B and C I thought it would be simple to make a similar loop. But the wp_query array seems to be special? Even though my array contains posts.

    while($related->have_posts()) { $related->the_post();

I get the following error: Fatal error: Uncaught Error: Call to a member function have_posts() on array

I've tried $relatedList = new WP_query($related); but it's not right. Any tips?

Edit: Hm seems like I might have been going about this the wrong way. Where I have my second loop I still have access to the main loop, so I could just do an reveres post-if-check there. Is this what I should be doing? (code-standard-wise)

1 Answer 1


The main problem here is that $wp_query is not an array. It's and instance of WP_Query class. That's why it has some methods like have_posts, the_post, and so on...

On the other hand, your $related is normal PHP array, so it doesn't have any methods - so if you try to call any method, you're getting fatal error.

Since the posts are already added to $related array, the easies way to deal with them would be to just loop through that array:

if ( ! empty($related) ) {
    foreach ( $related as $post) {
        // you can't use template tags in here unless you use setup_postdata function
  • I see, thank you! Of course, forgot the basic programming stuff right there smh.
    – Camathon
    May 27, 2018 at 0:35

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