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Changing Related Post Selection From Tags to Categories


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Hey Everyone.

I am hoping this is the right place to ask this question.

I am using a new WordPress theme and it has native related post coding in it. The problem is the code uses Post Tags as the selection value instead of Post Category. I was wondering if anyone could help me with this strip of code. I want to change it so the theme gets Posts in the same Category, instead of Posts with the same Tags.

* Display related posts.
* @return void
function stag_related_posts() {
    global $post;
    if( stag_rcp_user_has_no_access() )
    if( ! stag_theme_mod( 'post_settings', 'show_related_posts' ) )
    $tags = wp_get_post_tags( $post->ID );
    if ( count( $tags ) ) {
        $tags_ids = array();
        foreach($tags as $individual_tag) {
            $tag_ids[] = $individual_tag->term_id;
        $query = new WP_Query( array(
            'tag__in' => $tags_ids,
            'post__not_in' => array( $post->ID ),
            'posts_per_page' => absint( stag_theme_mod( 'post_settings', 'related_posts_count' ) ),
            'caller_get_posts' => 1
        ) );
        // Add filter to attach 'post-grid' class
        add_filter( 'stag_showing_related_posts', '__return_true' );
        if( $query->have_posts() ) :
            echo '<section class="related-posts" data-layout="2-2-2-2">';
            while( $query->have_posts() ) : $query->the_post();
                get_template_part( 'content', get_post_format() );
            echo '</section>';
    remove_all_filters( 'stag_showing_related_posts' );

I've tried simply replaces the words Tags with Categories, but it doesn't seem to do much.

Any help would be greatly, greatly, appreciated.

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