ReadByteAsync

:::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. :::

Read a single byte from the handle

public function readByteAsync(
  ?int $timeout_ns = NULL,
): Awaitable<string>;

Fails with EPIPE if the handle is closed or otherwise unreadable.

Parameters

• ?int $timeout_ns = NULL

Returns

• Awaitable<string>