추가 구매 상품을 1개~2개만 구매할 수 있도록 설정하고 싶어요.

function mshop_diy_adjust_stock_quantity( $option, $product ) {
    $option['stock_quantity'] = 2;

    return $option;
}

add_filter( 'msdp_make_dropdown_option', 'mshop_diy_adjust_stock_quantity', 99, 2 );


function mshop_diy_adjust_woocommerce_cart_item_quantity( $product_quantity, $cart_item_key, $cart_item ) {
    if ( msdp_is_set_product( $cart_item ) && ! msdp_is_set_parent( $cart_item ) ) {
        if ( msdp_cart_contains_set_parent( $cart_item['msdp_set_id'] ) ) {
            ob_start();
            ?>
            <input type="hidden" id="" class="qty" name="" value="">
            <?php
            $product_quantity = ob_get_clean();
        }
    }

    return $product_quantity;
}

add_filter( 'woocommerce_cart_item_quantity', 'mshop_diy_adjust_woocommerce_cart_item_quantity', 99, 3 );