Code WooCommerce làm quá tải host

functions.php

/*
* Code Bỏ /product/ hoặc /cua-hang/ hoặc /shop/ ... có hỗ trợ dạng %product_cat%
* Thay /cua-hang/ bằng slug hiện tại của bạn
*/
function devvn_remove_slug( $post_link, $post ) {
    if ( !in_array( get_post_type($post), array( 'product' ) ) || 'publish' != $post->post_status ) {
        return $post_link;
    }
    if('product' == $post->post_type){
        $post_link = str_replace( '/san-pham/', '/', $post_link ); //Thay cua-hang bằng slug hiện tại của bạn
    }else{
        $post_link = str_replace( '/' . $post->post_type . '/', '/', $post_link );
    }
    return $post_link;
}
add_filter( 'post_type_link', 'devvn_remove_slug', 10, 2 );
/*Sửa lỗi 404 sau khi đã remove slug product hoặc cua-hang*/
function devvn_woo_product_rewrite_rules($flash = false) {
    global $wp_post_types, $wpdb;
    $siteLink = esc_url(home_url('/'));
    foreach ($wp_post_types as $type=>$custom_post) {
        if($type == 'product'){
            if ($custom_post->_builtin == false) {
                $querystr = "SELECT {$wpdb->posts}.post_name, {$wpdb->posts}.ID
                            FROM {$wpdb->posts} 
                            WHERE {$wpdb->posts}.post_status = 'publish' 
                            AND {$wpdb->posts}.post_type = '{$type}'";
                $posts = $wpdb->get_results($querystr, OBJECT);
                foreach ($posts as $post) {
                    $current_slug = get_permalink($post->ID);
                    $base_product = str_replace($siteLink,'',$current_slug);
                    add_rewrite_rule($base_product.'?$', "index.php?{$custom_post->query_var}={$post->post_name}", 'top');                    
                    add_rewrite_rule($base_product.'comment-page-([0-9]{1,})/?$', 'index.php?'.$custom_post->query_var.'='.$post->post_name.'&cpage=$matches[1]', 'top');
                    add_rewrite_rule($base_product.'(?:feed/)?(feed|rdf|rss|rss2|atom)/?$', 'index.php?'.$custom_post->query_var.'='.$post->post_name.'&feed=$matches[1]','top');
                }
            }
        }
    }
    if ($flash == true)
        flush_rewrite_rules(false);
}
add_action('init', 'devvn_woo_product_rewrite_rules');
/*Fix lỗi khi tạo sản phẩm mới bị 404*/
function devvn_woo_new_product_post_save($post_id){
    global $wp_post_types;
    $post_type = get_post_type($post_id);
    foreach ($wp_post_types as $type=>$custom_post) {
        if ($custom_post->_builtin == false && $type == $post_type) {
            devvn_woo_product_rewrite_rules(true);
        }
    }
}
add_action('wp_insert_post', 'devvn_woo_new_product_post_save');
 
 
// Remove Parent Category from Child Category URL
add_filter('term_link', 'devvn_no_category_parents', 1000, 3);
function devvn_no_category_parents($url, $term, $taxonomy) {
    if($taxonomy == 'category'){
        $term_nicename = $term->slug;
        $url = trailingslashit(get_option( 'home' )) . user_trailingslashit( $term_nicename, 'category' );
    }
    return $url;
}
// Rewrite url mới
function devvn_no_category_parents_rewrite_rules($flash = false) {
    $terms = get_terms( array(
        'taxonomy' => 'category',
        'post_type' => 'post',
        'hide_empty' => false,
    ));
    if($terms && !is_wp_error($terms)){
        foreach ($terms as $term){
            $term_slug = $term->slug;
            add_rewrite_rule($term_slug.'/?$', 'index.php?category_name='.$term_slug,'top');
            add_rewrite_rule($term_slug.'/page/([0-9]{1,})/?$', 'index.php?category_name='.$term_slug.'&paged=$matches[1]','top');
            add_rewrite_rule($term_slug.'/(?:feed/)?(feed|rdf|rss|rss2|atom)/?$', 'index.php?category_name='.$term_slug.'&feed=$matches[1]','top');
        }
    }
    if ($flash == true)
        flush_rewrite_rules(false);
}
add_action('init', 'devvn_no_category_parents_rewrite_rules');
 
/*Sửa lỗi khi tạo mới category bị 404*/
function devvn_new_category_edit_success() {
    devvn_no_category_parents_rewrite_rules(true);
}
add_action('created_category','devvn_new_category_edit_success');
add_action('edited_category','devvn_new_category_edit_success');
add_action('delete_category','devvn_new_category_edit_success');