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Keys

hphp/hack/manual/apis/Classes/HH/Map/keys.md

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:::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 keys of the current Map

Hack
public function keys(): Vector<Tk>;

Returns

Examples

basic-usage.hack
$m = Map {
  'red' => '#ff0000',
  'green' => '#00ff00',
  'blue' => '#0000ff',
  'yellow' => '#ffff00',
};
\var_dump($m->keys());
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