Flush

:::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. :::

Flushes the current buffer

public function flush(
  bool $empty = true,
): mixed;

Parameters

• bool $empty = true - Whether to empty the buffer or no. Default is TRUE.

Returns

• mixed - - If you opened the writer in memory, this function returns the generated XML buffer, Else, if using URI, this function will write the buffer and return the number of written bytes.