PHPParser_NodeTraverser::addVisitor PHP Method

    public function addVisitor(PHPParser_NodeVisitor $visitor)
    {
        $this->visitors[] = $visitor;
    }

 /**
  * Creates a new traverser object and adds visitors.
  *
  * @return \PHPParser_NodeTraverser
  */
 protected function createTraverser()
 {
     $node_traverser = new \PHPParser_NodeTraverser();
     $node_traverser->addVisitor(new \PHPParser_NodeVisitor_NameResolver());
     foreach ($this->visitors as $visitor) {
         $node_traverser->addVisitor($visitor);
     }
     return $node_traverser;
 }