WriteImpl

:::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. :::

An immediate unordered write

protected function writeImpl(
  string $bytes,
): int;

Parameters

• string $bytes

Returns

• the - number of bytes written on success, which may be 0