ToImmMap

:::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 immutable map (ImmMap) based on the values of the current Set

public function toImmMap(): ImmMap<arraykey, Tv>;

Each key of the Map will be the same as its value.

Returns

• ImmMap<arraykey,Tv> - an ImmMap that that contains the values of the current Set, with each key of the Map being the same as its value.

Examples

$s = Set {'red', 'green', 'blue', 'yellow'};

$imm_map = $s->toImmMap();

\var_dump($imm_map is \HH\ImmMap<_, _>);
\var_dump($imm_map);