ToKeysArray

:::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 an array whose values are the keys of the current Map

public function toKeysArray(): varray<Tk>;

Returns

• varray<Tk> - an integer-indexed array containing the keys from the current Map.

Examples

$m = Map {
  'red' => '#ff0000',
  'green' => '#00ff00',
  'blue' => '#0000ff',
  'yellow' => '#ffff00',
};

$keys_array = $m->toKeysArray();

\var_dump(\HH\is_any_array($keys_array));
\var_dump($keys_array);