[Intrax search bar] The custom search bar for Intrax for searching on car brand/models #woocommerce

dsm_custom_sub_header_bar.php

add_shortcode('dsm_custom_sub_header_bar', 'dsm_custom_sub_header_bar_func');
function dsm_custom_sub_header_bar_func()
{
    global $woocommerce;

    $cat_args = array(
        'orderby' => 'name',
        'order' => 'asc',
        'hide_empty' => true,
        'parent' => 0
    );
    $blog_id = get_current_blog_id();
    switch_to_blog($blog_id);

    $product_categories = get_terms('product_cat', $cat_args);
    ob_start(); ?>

    <div class='dsm-sub-header'>
        <div class="container">
            <div class='left'>
                <p style="line-height:35px;">
                    <?php if (!is_front_page()) {
                        echo do_shortcode('[wpseo_breadcrumb]');
                    } ?>
                </p>
            </div>

            <div class='right '>
                <div style="line-height:35px;">
                    <p><?= __('Zoek uw product') ?>:</p>

                    <select name="dsm_merk" id="dsm_merk" class="dsm_merk hide-mobile">

                        <?php
                        $cookie_name = "intrax_category_search_parent";
                        if (isset($_COOKIE[$cookie_name])) {
                            echo $_COOKIE[$cookie_name];
                        } else { ?>
                            <option value=""><?= __('Selecteer een merk') ?></option>
                            <?php
                        }
                        ?>

                        <?php if (!empty($product_categories)): ?>
                            <?php foreach ($product_categories as $key => $category) :

                                $term_link = get_term_link($category, 'product_cat');

                                if ($blog_id == 2) {
                                    $term_link = str_replace("/producten/", "/products/", $term_link);
                                }
                                ?>
                                <option value="<?= $category->slug; ?>"
                                        data-link="<?= $term_link; ?>"><?= $category->name; ?></option>
                            <?php endforeach ?>
                        <?php endif ?>
                    </select>

                    <select name="dsm_model" id="dsm_model" class="dsm_model hide-mobile">

                        <?php
                        $cookie_name = "intrax_category_search_child";
                        if (isset($_COOKIE[$cookie_name]) && isset($_COOKIE['intrax_category_search_parent'])) {
                            echo $_COOKIE[$cookie_name];
                            $parent_cookie_slug = explode('"', $_COOKIE['intrax_category_search_parent'])[1];
                            echo get_all_child_categories_from_parent($parent_cookie_slug);
                        } else { ?>
                            <option value=""><?= __('Selecteer een model') ?></option>
                            <?php
                        }
                        ?>

                    </select>

                    <?php
                    $search_button_url = "/zoek-producten/";
                    if ($blog_id != 1) {
                        $search_button_url = "/en/search-products/";
                    }

                    $cookie_name = "intrax_category_search_url";
                    if (isset($_COOKIE[$cookie_name]) && !empty($_COOKIE[$cookie_name])) {
                        $search_button_url = $_COOKIE[$cookie_name];
                    } ?>

                    <a id="dsm_product_search" class='button button-primary dsm_product_search'
                       href="<?= $search_button_url; ?>"><?= __('Zoek producten') ?></a>
                </div>
            </div>
        </div>
    </div>
    <?php restore_current_blog();
    $result_html = ob_get_contents();
    ob_end_clean();

    return $result_html;
}