StartDocument

:::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. :::

Starts a document

public function startDocument(
  string $version = '1.0',
  string $encoding = NULL,
  string $standalone = NULL,
): bool;

Parameters

• string $version = '1.0' - The version number of the document as part of the XML declaration. Defaults to 1.0.
• string $encoding = NULL - The encoding of the document as part of the XML declaration. NULL by default.
• string $standalone = NULL - yes or no.

Returns

• bool - - Returns TRUE on success or FALSE on failure.