Hide error message if cart is empty in WooCommerce - php

Question

In WooCommerce, I am using a function that show an error message and prevent to checkout, if product from one specific category is alone in cart items.
But the error message remain displayed even if cart is empty.
How can I disable this function if cart is empty?
Here is my code:
function sv_wc_prevent_checkout_for_category() {
// set the slug of the category for which we disallow checkout
$category = 'clothing';
// get the product category
$product_cat = get_term_by( 'slug', $category, 'product_cat' );
// sanity check to prevent fatals if the term doesn't exist
if ( is_wp_error( $product_cat ) ) {
return;
}
$category_name = '' . $product_cat->name . '';
// check if this category is the only thing in the cart
if ( sv_wc_is_category_alone_in_cart( $category ) ) {
// render a notice to explain why checkout is blocked
wc_add_notice( sprintf( 'Hi there! Looks like your cart only contains products from the %1$s category – you must purchase a product from another category to check out.', $category_name ), 'error' );
}
}
add_action( 'woocommerce_check_cart_items', 'sv_wc_prevent_checkout_for_category' );
/**
* Checks if a cart contains exclusively products in a given category
*
* #param string $category the slug of the product category
* #return bool - true if the cart only contains the given category
*/
function sv_wc_is_category_alone_in_cart( $category ) {
// check each cart item for our category
foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
// if a product is not in our category, bail out since we know the category is not alone
if ( ! has_term( $category, 'product_cat', $cart_item['data']->id ) ) {
return false;
}
}
// if we're here, all items in the cart are in our category
return true;
}
Thanks

Answer 1

To avoid error message showing when cart is empty, you need to add in your first function condition ! WC()->cart->is_empty() this way:
// Check if this category is the only thing in the cart (when cart is not empty)
if ( sv_wc_is_category_alone_in_cart( $category ) && ! WC()->cart->is_empty() ) { // <= <=
So your first function code will be:
function sv_wc_prevent_checkout_for_category() {
// set the slug of the category for which we disallow checkout
$category = 'clothing';
// get the product category
$product_cat = get_term_by( 'slug', $category, 'product_cat' );
// sanity check to prevent fatals if the term doesn't exist
if ( is_wp_error( $product_cat ) ) {
return;
}
$category_name = '' . $product_cat->name . '';
// Check if this category is the only thing in the cart (when cart is not empty)
if ( sv_wc_is_category_alone_in_cart( $category ) && ! WC()->cart->is_empty() ) { // <==
// render a notice to explain why checkout is blocked
wc_add_notice( sprintf( 'Hi there! Looks like your cart only contains products from the %1$s category – you must purchase a product from another category to check out.', $category_name ), 'error' );
}
}
add_action( 'woocommerce_check_cart_items', 'sv_wc_prevent_checkout_for_category' );