Neos\Flow\Mvc\Routing\UriBuilder::mergeArgumentsWithRequestArguments PHP Method

    protected function mergeArgumentsWithRequestArguments(array $arguments)
    {
        if ($this->request !== $this->request->getMainRequest()) {
            $subRequest = $this->request;
            while ($subRequest instanceof ActionRequest) {
                $requestArguments = (array) $subRequest->getArguments();
                // Reset arguments for the request that is bound to this UriBuilder instance
                if ($subRequest === $this->request) {
                    if ($this->addQueryString === false) {
                        $requestArguments = [];
                    } else {
                        foreach ($this->argumentsToBeExcludedFromQueryString as $argumentToBeExcluded) {
                            unset($requestArguments[$argumentToBeExcluded]);
                        }
                    }
                } else {
                    // Remove all arguments of the current sub request if it's namespaced
                    if ($this->request->getArgumentNamespace() !== '') {
                        $requestNamespace = $this->getRequestNamespacePath($this->request);
                        if ($this->addQueryString === false) {
                            $requestArguments = Arrays::unsetValueByPath($requestArguments, $requestNamespace);
                        } else {
                            foreach ($this->argumentsToBeExcludedFromQueryString as $argumentToBeExcluded) {
                                $requestArguments = Arrays::unsetValueByPath($requestArguments, $requestNamespace . '.' . $argumentToBeExcluded);
                            }
                        }
                    }
                }
                // Merge special arguments (package, subpackage, controller & action) from main request
                $requestPackageKey = $subRequest->getControllerPackageKey();
                if (!empty($requestPackageKey)) {
                    $requestArguments['@package'] = $requestPackageKey;
                }
                $requestSubpackageKey = $subRequest->getControllerSubpackageKey();
                if (!empty($requestSubpackageKey)) {
                    $requestArguments['@subpackage'] = $requestSubpackageKey;
                }
                $requestControllerName = $subRequest->getControllerName();
                if (!empty($requestControllerName)) {
                    $requestArguments['@controller'] = $requestControllerName;
                }
                $requestActionName = $subRequest->getControllerActionName();
                if (!empty($requestActionName)) {
                    $requestArguments['@action'] = $requestActionName;
                }
                if (count($requestArguments) > 0) {
                    $requestArguments = $this->addNamespaceToArguments($requestArguments, $subRequest);
                    $arguments = Arrays::arrayMergeRecursiveOverrule($requestArguments, $arguments);
                }
                $subRequest = $subRequest->getParentRequest();
            }
        } elseif ($this->addQueryString === true) {
            $requestArguments = $this->request->getArguments();
            foreach ($this->argumentsToBeExcludedFromQueryString as $argumentToBeExcluded) {
                unset($requestArguments[$argumentToBeExcluded]);
            }
            if ($requestArguments !== []) {
                $arguments = Arrays::arrayMergeRecursiveOverrule($requestArguments, $arguments);
            }
        }
        return $arguments;
    }