arrayCombinations example

if (!isset($configurations[$product->getNumber()]) || !isset($prices[$product->getId()])) {
                    continue;
                }

                $configuration = $configurations[$product->getNumber()];
                $groups = $this->getFilteredGroups($configuration, $variantFacet);

                if (empty($groups)) {
                    continue;
                }

                $combinations = self::arrayCombinations($groups);

                $combinationPrices[$key][$product->getNumber()] = $this->getCombinationPrices(
                    $configuration,
                    $prices[$product->getId()],
                    $combinations,
                    $variantFacet
                );
            }
        }

        $contexts = $this->getPriceContexts($shop);