Custom fields errors

//if required field of the table order and products or categories restriction
if($field->field_table == 'order' && ($field->field_products != 'all' || $field->field_categories != 'all')){
	$cartClass = hikashop_get('class.cart');
	$fieldClass = hikashop_get('class.field');

	$cart = $cartClass->loadFullCart(true);
	$inCart = false;

	$restricted_products = array ();
	$restricted_categories = array();
	//Product check
	if($field->field_products != 'all'){
		$restricted_products = explode(',', $field->field_products);
		$restricted_products = array_filter($restricted_products);

		foreach($cart->cart_products as $cart_product){
			if(in_array($cart_product->product_id, $restricted_products))
				$inCart = true;
		}
	}
	//Category check
	if($field->field_categories != 'all' && !$inCart){
		$restricted_categories = explode(',', $field->field_categories);
		$restricted_categories = array_filter($restricted_categories);

		$cart_categories = $fieldClass->getCategories('order', $cart);

		foreach($restricted_categories as $restricted_category){
			if($field->field_with_sub_categories && in_array($restricted_category, $cart_categories['parents']))
				$inCart = true;
			else if(!$field->field_with_sub_categories && in_array($restricted_category, $cart_categories['originals']))
				$inCart = true;
		}
	}

	if(!$inCart)
		return true;

}

function check(&$field,&$value,$oldvalue) {
	if(is_string($value))
		$value = trim($value);

	if(!$field->field_required || is_array($value) || strlen($value) || strlen($oldvalue))
		return true;