keys
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 a MutableVector containing the values of the current
MutableSet
public function keys(): MutableVector<arraykey>;
Sets don't have keys, so this will return the values.
This method is interchangeable with values().
Returns
MutableVector<arraykey>- aMutableVector(integer-indexed) containing the values of the currentMutableSet.