(PHP 5, PHP 7, PHP 8)
$exclusive = false
   , bool $withComments = false
   , array|null $xpath = null
   , array|null $nsPrefixes = null
   ) : string|false$uri
   , bool $exclusive = false
   , bool $withComments = false
   , array|null $xpath = null
   , array|null $nsPrefixes = null
   ) : int|false