/**
  * {@inheritdoc}
  */
 public function getFunction($name, $namespace = '')
 {
     $parsedFunctions = $this->parserStorage->getFunctions();
     $function = $this->findElementByNameAndNamespace($parsedFunctions, $name, $namespace);
     if ($function && $function->isDocumented()) {
         return $function;
     }
     return null;
 }