rewrite hell

permalink_fix.php

<?php
function features_rewrite_link($post_link, $id = 0)
{
    $post = get_post($id);
    if ( is_object( $post ) && $post->post_type == 'features' ){
        $terms = wp_get_object_terms($post->ID, 'product_cats');
        if ($terms) {
            return str_replace('%category%', $terms[0]->slug, $post_link);
        }
    }
    return $post_link;
}
add_filter('post_type_link', 'features_rewrite_link', 1, 3);

add_filter( 'post_type_link', function($post_link, $post, $leavename) {
    if ('products' == $post->post_type && 'publish' == $post->post_status) {
        $post_link = site_url('/') . $post->post_name .'/';
    }

    return $post_link;

}, 10, 3 );

function resources_cpt_generating_rule($wp_rewrite) {
    $rules = array();
    $terms = get_terms( array(
        'taxonomy' => 'product_cats',
        'hide_empty' => false,
    ) );
   
    $post_type = 'features';

    foreach ($terms as $term) {    
                
        $rules[$term->slug . '/([^/]*)$'] = 'index.php?post_type=' . $post_type. '&name=$matches[1]';
                        
    }

    // merge with global rules
    $wp_rewrite->rules = $rules + $wp_rewrite->rules;
}
add_filter('generate_rewrite_rules', 'resources_cpt_generating_rule');

add_action( 'parse_request', function ( $wp ) {
        // if we get a products request, we check if it is actually a product, if not it's a root level page, and we fix that in the vars
        if ( array_key_exists('products', $wp->query_vars) && array_key_exists('page', $wp->query_vars) ) {
            $custom_post = get_page_by_path( $wp->request, OBJECT);

            if ( $custom_post instanceof WP_Post ) {
                $terms = get_terms( array(
                    'taxonomy' => 'product_cats',
                    'hide_empty' => false,
                ) );
                foreach ($terms as $term) { 
                    $products_array[] = $term->slug;
                }
                if(empty(array_intersect($products_array, $wp->query_vars))){
                    unset($wp->query_vars['error'] );
                    unset($wp->query_vars['features']);
                    unset($wp->query_vars['post_type']);
                    unset($wp->query_vars['products']);
                    $wp->query_vars['post_type'] = 'page';
                    $wp->query_vars['page'] = $wp->query_vars['name'];

                }
                
            }            
        }
        // sometimes it kicks other post out as attachments, we handle that here as needed
        if ( array_key_exists('attachment', $wp->query_vars)) {
            $post_object = get_page_by_path($wp->query_vars['attachment'],OBJECT,'post');
            $wp->query_vars['post_type'] = $post_object->post_type;
            $wp->query_vars['name'] = $post_object->post_name;
            
        }

    return $wp;
} );