Keys

:::info[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 Vector containing the values of the current Set

public function keys(): Vector<arraykey>;

Sets don't have keys, so this will return the values.

This method is interchangeable with toVector() and values().

Returns

• Vector<arraykey> - a Vector (integer-indexed) containing the values of the current Set.

Examples

This example shows that keys() returns a Vector of the Set's values because Sets don't have keys:

$s = Set {'red', 'green', 'blue', 'yellow'};
\var_dump($s->keys());