# The ReflectionType class

(PHP 7, PHP 8)

## Introduction

The ReflectionType class reports information about a function's parameter/return type or a class's property type. The Reflection extension declares the following subtypes:

- ReflectionNamedType (as of PHP 7.1.0)
- ReflectionUnionType (as of PHP 8.0.0)
- ReflectionIntersectionType (as of PHP 8.1.0)

## Class synopsis

abstract class ReflectionType implements Stringable {
/* Methods */
public allowsNull(): bool
public __toString(): string
}

## Changelog

Version | Description
--- | ---
8.0.0 | ReflectionType has become abstract and ReflectionType::isBuiltin() has been moved to ReflectionNamedType::isBuiltin().

## Table of Contents

- ReflectionType::allowsNull — Checks if null is allowed
- ReflectionType::__toString — To string

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