src/Debug/FileStreamWrapper.php
public function dir_closedir()
    {
        if (!$this->handle) {
            return false;
        }
        self::restorePrev();
        \closedir($this->handle);
        self::register();
        $this->handle = null;
        return true;
    }
public function dir_closedir()
    {
        if (!$this->handle) {
            return false;
        }
        self::restorePrev();
        \closedir($this->handle);
        self::register();
        $this->handle = null;
        return true;
    }
Close the directory

@return boolean

@see http://php.net/manual/en/streamwrapper.dir-closedir.php