Woocommerce Products Per Page Selector

functions.php

/* WooCommerce */

// Products per page
function woocommerce_catalog_page_ordering()
{ ?>
    <form action="/shop" method="POST" name="results">
        <select name="woocommerce-sort-by-columns" id="woocommerce-sort-by-columns" class="sortby" onchange="this.form.submit()">
            <?php   
                $shopCatalog_orderby = apply_filters('woocommerce_sortby_page', array(
                    ''  => __('Results per page', 'woocommerce'),
                    '2' => __('2 per page', 'woocommerce'),
                    '4' => __('4 per page', 'woocommerce'),
                    '6' => __('6 per page', 'woocommerce'),
                    '8' => __('8 per page', 'woocommerce'),
                ));
    
                foreach ($shopCatalog_orderby as $sort_id => $sort_name) {
                    $is_selected = (isset($_POST['woocommerce-sort-by-columns']) && (int) $_POST['woocommerce-sort-by-columns'] === (int) $sort_id) ? 'selected' : ((isset($_COOKIE['shop_pageResults']) && (int) $_COOKIE['shop_pageResults'] === (int) $sort_id) ? 'selected' : '');
                    echo '<option value="' . $sort_id . '" ' . selected( $_SESSION['sortby'], $sort_id, false ) . ' '.$is_selected.'>' . $sort_name . '</option>';
                }
            ?>
        </select>
    </form>
<?php } 

// Set Cookie
function dl_sort_by_page($count)
{
    if (isset($_COOKIE['shop_pageResults'])) { // if normal page load with cookie
        $count = $_COOKIE['shop_pageResults'];
    }
    
    if (isset($_POST['woocommerce-sort-by-columns'])) { //if form submitted
        setcookie('shop_pageResults', $_POST['woocommerce-sort-by-columns'], time()+1209600, '/', 'keigan.dev', false); //this will fail if any part of page has been output- hope this works!
        $count = $_POST['woocommerce-sort-by-columns'];
    }
    
    // else normal page load and no cookie
    return $count;
}

add_filter('loop_shop_per_page','dl_sort_by_page');
add_action('woocommerce_before_shop_loop', 'woocommerce_catalog_page_ordering', 20);