schmittjoh / JMSSerializerBundle

                                    ->ifArray()->then(function($v) {

                                        $options = 0;

                                        foreach ($v as $option) {

                                            if (is_numeric($option)) {

                                                $options |= (int) $option;

                                            } elseif (defined($option)) {

                                                $options |= constant($option);

                                            } else {

                                                throw new InvalidArgumentException('Expected either an integer representing one of the JSON_ constants, or a string of the constant itself.');

                                            }

                                        }

                                        return $options;

                                ->end()

                                ->beforeNormalization()

                                    ->ifString()->then(function($v) {

                                        if (is_numeric($v)) {

                                            $value = (int) $v;

                                        } elseif (defined($v)) {

                                            $value = constant($v);

                                        } else {

                                            throw new InvalidArgumentException('Expected either an integer representing one of the JSON_ constants, or a string of the constant itself.');

                                        }

                                        return $value;

                                    })