gistfile1.txt

Only add items in a category group only in to cart - WooCommerce 4

function sa45er_category_group_validation($valid, $product_id, $quantity) {
	global $woocommerce;
	if($woocommerce->cart->cart_contents_count == 0){
		 return $valid;
	}
	
	$target_cat_group = array(
		array(17,20), // Update your product category
		array(19,18), // Update your product category
	);
	
	$this_product_terms = get_the_terms( $product_id, 'product_cat' );
	foreach ($this_product_terms as $term) {
		$this_product_cat_ids[] = $term->term_id; 
	}        
			
	foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $values ) {
		$_product = $values['data'];
		$terms = get_the_terms( $_product->get_ID(), 'product_cat' );
		foreach ($terms as $term) {
			$cart_cat_ids[] = $term->term_id;  
		}       
	}
	
	$all_cats = array_merge($this_product_cat_ids,$cart_cat_ids);
	
	$result = array();
	foreach($target_cat_group as $target_cat_group_item){
			
		$intrsct = array_intersect($all_cats, $target_cat_group_item);
		
		if( !empty( $intrsct ) ){
			$result[] = $intrsct;
		}
			
	}
	
	if(count($result) > 1){
		wc_add_notice( 'You can\'t add this product with your current cart items.', 'error' );
		return false;
	}
	
	return $valid;
}
add_filter( 'woocommerce_add_to_cart_validation', 'sa45er_category_group_validation',10,3);