*/ public static function getFunctionIds() : array; /** * Use this hook for informing whether or not a global function exists. If you know the function does * not exist, return false. If you aren't sure if it exists or not, return null and the default analysis * will continue to determine if the function actually exists. * * @return ?bool */ public static function doesFunctionExist( StatementsSource $statements_source, string $function_id ); }