PhpParser\NodeTraverser::traverse PHP Method

    public function traverse(array $nodes)
    {
        foreach ($this->visitors as $visitor) {
            if (null !== ($return = $visitor->beforeTraverse($nodes))) {
                $nodes = $return;
            }
        }
        $nodes = $this->traverseArray($nodes);
        foreach ($this->visitors as $visitor) {
            if (null !== ($return = $visitor->afterTraverse($nodes))) {
                $nodes = $return;
            }
        }
        return $nodes;
    }

 /**
  * @param Node\Stmt\Class_ $node
  *
  * @return Node\Stmt\Class_
  */
 public function resolveConstructor(Node\Stmt\Class_ $node)
 {
     foreach ($node->stmts as $key => $stmt) {
         if ($stmt instanceof Node\Stmt\ClassMethod && $stmt->name === '__construct') {
             // this will make problems we need an layer above which chains the variable resolvers
             // because we need may need more than this resolver
             // skip constructor if is abstract
             if ($stmt->isAbstract()) {
                 return $node;
             }
             // change recursivly the nodes
             $subTraverser = new NodeTraverser();
             foreach ($this->visitors as $visitor) {
                 $subTraverser->addVisitor($visitor);
             }
             // the table switches to a method scope
             // $x = ... will be treated normal
             // $this->x = ... will be stored in the above class scope and is available afterwards
             $this->table->enterScope(new TableScope(TableScope::CLASS_METHOD_SCOPE));
             $subTraverser->traverse($stmt->params);
             $nodes = $subTraverser->traverse($stmt->stmts);
             $this->table->leaveScope();
             //override the old statement
             $stmt->stmts = $nodes;
             // override the classmethod statement in class
             $node->stmts[$key] = $stmt;
             // return the changed node to override it
             return $node;
         }
     }
     // no constructor defined
     return $node;
 }