Contains

:::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. :::

:::warning Deprecated: Use Vector::containsKey() for key search or Vector::linearSearch() for value search. :::

Returns true if the specified key is present in the Vector, returns false otherwise

public function contains(
  mixed $key,
): bool;

Parameters

• mixed $key

Returns

• bool