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hasConstant

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.

( excerpt from http://php.net/manual/en/reflectionclass.hasconstant.php )

public function hasConstant(
  string $name,
): bool;

Checks whether the class has a specific constant defined or not.

Parameters​

  • string $name

Returns​

  • bool - TRUE if the constant is defined, otherwise FALSE.