LookupNamespaceUri - Hhvm

:::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 URI of the node based on the prefix

Hack

public function lookupNamespaceUri(
  mixed $namespaceuri,
): string;

Parameters

mixed $namespaceuri - The prefix of the namespace.

Returns

mixed - - The namespace URI of the node.