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getEnumUnderlyingType

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

Returns the underlying type of this ReflectionClass, given that it represents an enum

public function getEnumUnderlyingType(): string;

If it does not, it throws.

Returns​

  • string - the string representation of the underlying type.