__toString

:::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 the string version of this ImmSet, which is "ImmSet"

public function __toString(): string;

Returns

• string - The string "ImmSet".

Examples

The string version of an ImmSet is always "ImmSet":

$is = ImmSet {1, 2, 3};
echo $is->__toString()."\n";

$is2 = ImmSet {'a', 'b', 'c'};
echo $is2->__toString()."\n";

$is3 = ImmSet {};
echo $is3->__toString()."\n";