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Converts between objects and arrays by mapping properties.

The normalization process looks for all the object's properties (public and private). The result is a map from property names to property values. Property values are normalized through the serializer.

The denormalization first looks at the constructor of the given class to see if any of the parameters have the same name as one of the properties. The constructor is then called with all parameters or an exception is thrown if any required parameters were not present as properties. Then the denormalizer walks through the given map of property names to property values to see if a property with the corresponding name exists. If found, the property gets the value.

CloneableFinalInstantiable
Constants
public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::ALLOW_EXTRA_ATTRIBUTES = 'allow_extra_attributes'
 

If ATTRIBUTES are specified, and the source has fields that are not part of that list, either ignore those attributes (true) or throw an ExtraAttributesException (false).

public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::ATTRIBUTES = 'attributes'
 

Limit (de)normalize to the specified names.

For nested structures, this list needs to reflect the object tree.

public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::CALLBACKS = 'callbacks'
 

Hashmap of field name => callable to (de)normalize this field.

The callable is called if the field is encountered with the arguments:

  • mixed $attributeValue value of this field
  • object|string $object the whole object being normalized or the object's class being denormalized
  • string $attributeName name of the attribute being (de)normalized
  • string $format the requested format
  • array $context the serialization context
public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::CIRCULAR_REFERENCE_HANDLER = 'circular_reference_handler'
 

Handler to call when a circular reference has been detected.

If you specify no handler, a CircularReferenceException is thrown.

The method will be called with ($object, $format, $context) and its return value is returned as the result of the normalize call.

public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::CIRCULAR_REFERENCE_LIMIT = 'circular_reference_limit'
 

How many loops of circular reference to allow while normalizing.

The default value of 1 means that when we encounter the same object a second time, we consider that a circular reference.

You can raise this value for special cases, e.g. in combination with the max depth setting of the object normalizer.

public Symfony\Component\Serializer\Normalizer\DenormalizerInterface::COLLECT_DENORMALIZATION_ERRORS = 'collect_denormalization_errors'
public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::DEEP_OBJECT_TO_POPULATE = 'deep_object_to_populate'
 

Flag to tell the denormalizer to also populate existing objects on attributes of the main object.

Setting this to true is only useful if you also specify the root object in OBJECT_TO_POPULATE.

public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::DEFAULT_CONSTRUCTOR_ARGUMENTS = 'default_constructor_arguments'
 

Hashmap of default values for constructor arguments.

The names need to match the parameter names in the constructor arguments.

public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::DEPTH_KEY_PATTERN = 'depth_%s::%s'
 

How to track the current depth in the context.

public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::DISABLE_TYPE_ENFORCEMENT = 'disable_type_enforcement'
 

While denormalizing, we can verify that type matches.

You can disable this by setting this flag to true.

public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::ENABLE_MAX_DEPTH = 'enable_max_depth'
 

Set to true to respect the max depth metadata on fields.

public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::EXCLUDE_FROM_CACHE_KEY = 'exclude_from_cache_key'
 

Specify which context key are not relevant to determine which attributes of an object to (de)normalize.

public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::FILTER_BOOL = 'filter_bool'
 

Flag to control whether a non-boolean value should be filtered using the filter_var function with the {@see https://www.php.net/manual/fr/filter.filters.validate.php} \FILTER_VALIDATE_BOOL filter before casting it to a boolean.

"0", "false", "off", "no" and "" will be cast to false. "1", "true", "on" and "yes" will be cast to true.

public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::GROUPS = 'groups'
 

Only (de)normalize attributes that are in the specified groups.

public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::IGNORED_ATTRIBUTES = 'ignored_attributes'
 

Skip the specified attributes when normalizing an object tree.

This list is applied to each element of nested structures.

Note: The behaviour for nested structures is different from ATTRIBUTES for historical reason. Aligning the behaviour would be a BC break.

public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::MAX_DEPTH_HANDLER = 'max_depth_handler'
 

Callback to allow to set a value for an attribute when the max depth has been reached.

If no callback is given, the attribute is skipped. If a callable is given, its return value is used (even if null).

The arguments are:

  • mixed $attributeValue value of this field
  • object $object the whole object being normalized
  • string $attributeName name of the attribute being normalized
  • string $format the requested format
  • array $context the serialization context
public Symfony\Component\Serializer\Normalizer\PropertyNormalizer::NORMALIZE_PRIVATE = 4
public Symfony\Component\Serializer\Normalizer\PropertyNormalizer::NORMALIZE_PROTECTED = 2
public Symfony\Component\Serializer\Normalizer\PropertyNormalizer::NORMALIZE_PUBLIC = 1
public Symfony\Component\Serializer\Normalizer\PropertyNormalizer::NORMALIZE_VISIBILITY = 'normalize_visibility'
 

Flag to control whether fields should be output based on visibility.

public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::OBJECT_TO_POPULATE = 'object_to_populate'
 

Instead of creating a new instance of an object, update the specified object.

If you have a nested structure, child objects will be overwritten with new instances unless you set DEEP_OBJECT_TO_POPULATE to true.

public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::PRESERVE_EMPTY_OBJECTS = 'preserve_empty_objects'
 

Flag to control whether an empty object should be kept as an object (in JSON: {}) or converted to a list (in JSON: []).

public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::REQUIRE_ALL_PROPERTIES = 'require_all_properties'
 

Require all properties to be listed in the input instead of falling back to null for nullable ones.

public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::SKIP_NULL_VALUES = 'skip_null_values'
 

Flag to control whether fields with the value null should be output when normalizing or omitted.

public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::SKIP_UNINITIALIZED_VALUES = 'skip_uninitialized_values'
 

Flag to control whether uninitialized PHP>=7.4 typed class properties should be excluded when normalizing.

Methods
public __construct(?Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface $classMetadataFactory = NULL, ?Symfony\Component\Serializer\NameConverter\NameConverterInterface $nameConverter = NULL, ?Symfony\Component\PropertyInfo\PropertyTypeExtractorInterface $propertyTypeExtractor = NULL, ?Symfony\Component\Serializer\Mapping\ClassDiscriminatorResolverInterface $classDiscriminatorResolver = NULL, ?callable $objectClassResolver = NULL, array $defaultContext = [])
public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::denormalize(?mixed $data, string $type, ?string $format = NULL, array $context = []) : ?mixed
public getSupportedTypes(?string $format) : array
public Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::normalize(?mixed $data, ?string $format = NULL, array $context = []) : ArrayObject|array|string|int|float|bool|?null
public Symfony\Component\Serializer\Normalizer\AbstractNormalizer::setSerializer(Symfony\Component\Serializer\SerializerInterface $serializer) : void
public supportsDenormalization(?mixed $data, string $type, ?string $format = NULL, array $context = []) : bool
public supportsNormalization(?mixed $data, ?string $format = NULL, array $context = []) : bool
Constants
protected Symfony\Component\Serializer\Normalizer\AbstractNormalizer::CIRCULAR_REFERENCE_LIMIT_COUNTERS = 'circular_reference_limit_counters'
 
  • internal
Properties
protected ?Symfony\Component\Serializer\Mapping\ClassDiscriminatorResolverInterface Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::$classDiscriminatorResolver
protected ?Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface Symfony\Component\Serializer\Normalizer\AbstractNormalizer::$classMetadataFactory
protected array Symfony\Component\Serializer\Normalizer\AbstractNormalizer::$defaultContext = ['allow_extra_attributes' => true, 'circular_reference_handler' => NULL, 'circular_reference_limit' => 1, 'ignored_attributes' => []]
protected ?Symfony\Component\Serializer\NameConverter\NameConverterInterface Symfony\Component\Serializer\Normalizer\AbstractNormalizer::$nameConverter
protected ?Symfony\Component\Serializer\SerializerInterface Symfony\Component\Serializer\Normalizer\AbstractNormalizer::$serializer = NULL
Methods
protected final Symfony\Component\Serializer\Normalizer\AbstractNormalizer::applyCallbacks(?mixed $value, object|string $object, string $attribute, ?string $format, array $context) : ?mixed
protected final Symfony\Component\Serializer\Normalizer\AbstractNormalizer::applyFilterBool(ReflectionParameter $parameter, ?mixed $value, array $context) : ?mixed
protected Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::createChildContext(array $parentContext, string $attribute, ?string $format) : array
 

Overwritten to update the cache key for the child.

We must not mix up the attribute cache between parent and children.

  • internal
protected Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::denormalizeParameter(ReflectionClass $class, ReflectionParameter $parameter, string $parameterName, ?mixed $parameterData, array $context, ?string $format = NULL) : ?mixed
 
  • internal
protected extractAttributes(object $object, ?string $format = NULL, array $context = []) : array
protected Symfony\Component\Serializer\Normalizer\AbstractNormalizer::extractObjectToPopulate(string $class, array $context, ?string $key = NULL) : ?object
 

Extract the object_to_populate field from the context if it exists and is an instance of the provided $class.

  • param string $class The class the object should be
  • param string|null $key They in which to look for the object to populate. Keeps backwards compatibility with AbstractNormalizer.
protected Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::getAllowedAttributes(object|string $classOrObject, array $context, bool $attributesAsString = false) : array|bool
protected Symfony\Component\Serializer\Normalizer\AbstractNormalizer::getAttributeDenormalizationContext(string $class, string $attribute, array $context) : array
 

Computes the denormalization context merged with current one. Metadata always wins over global context, as more specific.

  • internal
protected Symfony\Component\Serializer\Normalizer\AbstractNormalizer::getAttributeMetadata(object|string $objectOrClass, string $attribute) : ?Symfony\Component\Serializer\Mapping\AttributeMetadataInterface
 
  • internal
protected Symfony\Component\Serializer\Normalizer\AbstractNormalizer::getAttributeNormalizationContext(object $object, string $attribute, array $context) : array
 

Computes the normalization context merged with current one. Metadata always wins over global context, as more specific.

  • internal
protected Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::getAttributes(object $object, ?string $format, array $context) : array
 

Gets and caches attributes for the given object, format and context.

  • return string[]
protected getAttributeValue(object $object, string $attribute, ?string $format = NULL, array $context = []) : ?mixed
protected Symfony\Component\Serializer\Normalizer\AbstractNormalizer::getConstructor(array $data, string $class, array $context, ReflectionClass $reflectionClass, array|bool $allowedAttributes) : ?ReflectionMethod
 

Returns the method to use to construct an object. This method must be either the object constructor or static.

protected Symfony\Component\Serializer\Normalizer\AbstractNormalizer::getGroups(array $context) : array
protected Symfony\Component\Serializer\Normalizer\AbstractNormalizer::handleCircularReference(object $object, ?string $format = NULL, array $context = []) : ?mixed
 

Handles a circular reference.

If a circular reference handler is set, it will be called. Otherwise, a {@class CircularReferenceException} will be thrown.

  • final
  • throws \CircularReferenceException
protected Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::instantiateObject(array $data, string $class, array $context, ReflectionClass $reflectionClass, array|bool $allowedAttributes, ?string $format = NULL) : object
protected isAllowedAttribute(object|string $classOrObject, string $attribute, ?string $format = NULL, array $context = []) : bool
protected Symfony\Component\Serializer\Normalizer\AbstractNormalizer::isCircularReference(object $object, array $context) : bool
 

Detects if the configured circular reference limit is reached.

  • throws \CircularReferenceException
protected Symfony\Component\Serializer\Normalizer\AbstractNormalizer::prepareForDenormalization(?mixed $data) : array
 

Normalizes the given data to an array. It's particularly useful during the denormalization process.

protected setAttributeValue(object $object, string $attribute, ?mixed $value, ?string $format = NULL, array $context = []) : void
protected final Symfony\Component\Serializer\Normalizer\AbstractNormalizer::validateCallbackContext(array $context, string $contextType = '') : void
 

Validate callbacks set in context.

  • param string $contextType Used to specify which context is invalid in exceptions
  • throws \InvalidArgumentException
Methods
private getReflectionProperty(object|string $classOrObject, string $attribute) : ReflectionProperty
 
  • throws \ReflectionException
private supports(string $class) : bool
 

Checks if the given class has any non-static property.

© 2025 Bruce Wells