FromKeysOf - Hhvm — ContextQMD

:::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. :::

Creates an ImmVector from the keys of the specified container

Hack

public static function fromKeysOf<Tk as arraykey>(
  ?KeyedContainer<Tk, mixed> $container,
): ImmVector<Tk>;

Every key in the provided KeyedContainer will appear sequentially in the returned ImmVector, with the next available integer key assigned to each.

Parameters

?KeyedContainer<Tk,mixed> $container - The container with the keys used to create the current ImmVector.

Returns

ImmVector<Tk> - An ImmVector built from the keys of the specified container.

Examples

See Vector::fromKeysOf for usage examples.