Moving files from one webserver to another using PHP script

/**
 * PHP Migrate Site
 * Proof of Concept
 *
 * This class is used to migrate files including their permissions from one server
 * to another via FTP
 *
 * @author Aaron Saray (http://aaronsaray.com)
 */
class php_migrate_site
{
  /**
   * @var string the full filename of this file
   */
  protected $_self;
 
  /**
   * @var string The base directory of our files to move
   */
  protected $_basedir;
 
  /**
   * @var array the array of SPLFileInfo objects from self::$_basedir
   */
  protected $_files = array();
 
  /**
   * @var resource The connection to the ftp server for the new files
   */
  protected $_ftpConnection;
 
  /**
   * Constructor sets time limit, gets self, sets credentials
   */
  public function __construct()
  {
    set_time_limit(0);

    $this->_self = __FILE__;

    $this->_basedir = 'C:/DEVELOPMENT/local';
    $this->_ftp = array('username'=>'test', 'password'=>'', 'hostname'=>'localhost');
  }
        
  /**
   * main public method to launch process
   */
  public function go()
  {
    $this->_loadFiles();
    $this->_makeFTPConnection();
    $this->_copyFiles();
  }

  /**
   * Loads all of the files from basedir using a 
   * recursive directory iterator from SPL
   */
  protected function _loadFiles()
  {
    $this->_files = new RecursiveIteratorIterator(
      new RecursiveDirectoryIterator($this->_basedir),
      RecursiveIteratorIterator::SELF_FIRST
    );
  }

  /**
   * Connects to ftp server and stores connection to self::$_ftpConnection
   */
  protected function _makeFTPConnection()
  {
    $this->_ftpConnection = ftp_connect($this->_ftp['hostname']) 
                          or die('could not connect');
    ftp_login(
      $this->_ftpConnection, 
      $this->_ftp['username'], 
      $this->_ftp['password']
    );
  }

  /**
   * Copies files from local to ftp - applies permissions to them.
   */
  protected function _copyFiles()
  {
    foreach ($this->_files as $file) {
      $localFileName = $file->getPath() . DIRECTORY_SEPARATOR . $file->getFilename();
      $remoteFileName = str_ireplace($this->_basedir, '', $localFileName);

      /** don't move self **/
      if ($localFileName == $this->_self) continue;

      if ($file->isDir()) {
        ftp_mkdir($this->_ftpConnection, $remoteFileName);
      }
      else {
        ftp_put($this->_ftpConnection, $remoteFileName, $localFileName, FTP_BINARY);
      }

      $chmod = substr(sprintf('%o', $file->getPerms()), -4);
      ftp_chmod($this->_ftpConnection, $chmod, $remoteFileName);
    }
  }
}

/** create new instance and run php_migrate_site::go() method **/
$migrate = new php_migrate_site();
$migrate->go();