LookupPrefix

:::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. :::

Gets the namespace prefix of the node based on the namespace URI

public function lookupPrefix(
  string $namespaceURI,
): string;

Parameters

• string $namespaceURI

Returns

• mixed - - The prefix of the namespace.