Exclude Category (red) from Related Posts | Total WordPress Theme

gistfile1.txt

// Exclude "red" term from related blog posts.
add_filter( 'wpex_blog_post_related_query_args', function( $args ) {

    $exclude_terms = array(
        'relation'  => 'AND',
        array(
            'taxonomy' => 'category',
            'field'    => 'slug',
            'terms'    => array( 'red' ),
            'operator' => 'NOT IN',
        ),
    );

    if ( isset( $args['tax_query'] ) ) {
        $args['tax_query'] = array_merge( $args['tax_query'], $exclude_terms );
    } else {
        $args['tax_query'] = $exclude_terms;
    }

    return $args;
} );