FormInterface offsetGet(string $name) Returns the child with the given name (implements the \ArrayAccess interface). Parameters string $name The name of the child Return Value FormInterface The child form Exceptions OutOfBoundsException If the named child does not exist.

FormField offsetGet(string $name) Gets the value of a field. Parameters string $name The field name Return Value FormField The associated Field instance Exceptions InvalidArgumentException if the field does not exist

offsetSet(string $name, string|array $value) Sets the value of a field. Parameters string $name The field name string|array $value The value of the field Exceptions InvalidArgumentException if the field does not exist

offsetSet(string $name, FormInterface $child) Adds a child to the form (implements the \ArrayAccess interface). Parameters string $name Ignored. The name of the child is used FormInterface $child The child to be added Exceptions AlreadySubmittedException If the form has already been submitted. LogicException When trying to add a child to a non-compound form. See also self::add()

bool isRoot() Returns whether the field is the root of the form tree. Return Value bool

bool isValid() Returns whether the form and all children are valid. If the form is not submitted, this method always returns false. Return Value bool

bool isSubmitted() Returns whether the form is submitted. Return Value bool true if the form is submitted, false otherwise

bool isSynchronized() Returns whether the data in the different formats is synchronized. If the data is not synchronized, you can get the transformation failure by calling {@link getTransformationFailure()}. Return Value bool

bool offsetExists(string $name) Returns true if the named field exists. Parameters string $name The field name Return Value bool true if the field exists, false otherwise

FormInterface initialize() Initializes the form tree. Should be called on the root form after constructing the tree. Return Value FormInterface The form instance