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isDefaultNamespace

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.

Tells whether namespaceURI is the default namespace

public function isDefaultNamespace(
  string $namespaceuri,
): bool;

Parameters​

  • string $namespaceuri - The namespace URI to look for.

Returns​

  • bool - - Return TRUE if namespaceURI is the default namespace, FALSE otherwise.