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WriteImpl

hphp/hack/manual/hsl/Interfaces/HH.Lib.IO/WriteHandle/writeImpl.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. :::

An immediate unordered write

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

Parameters

  • string $bytes

Returns

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