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lookupPrefix

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.