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ReadByteAsync

hphp/hack/manual/hsl/Classes/HH.Lib.IO/BufferedReader/readByteAsync.md

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:::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

Hack
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

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