                        array_push($nodes[$level], $childNode);
                    }
                }
            }
            $level--;
            if ($level && isset($closingNodes[$level])) {
                while($node = array_pop($closingNodes[$level])) {
                    $this->createEndNode($node, $tokens);
                }
            }
        } while ($level > 0);
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.