A simple PHP FTP class to list and download files

ftp.php

<?php

class FTP {
  
    /**
     * Download() performs an automatic syncing of files and folders from a remote location
     * preserving folder and file names and structure
     * 
     * @param $local_dir: The directory to put the files, must be in app path and be writeable
     * @param   $remote_dir: The directory to start traversing from. Use "." for root dir
     * 
     * @return  null
     */
    public static function download($local_dir, $remote_dir, $ftp_conn) 
    {
    
      if ($remote_dir != ".") {
          if (ftp_chdir($ftp_conn, $remote_dir) == false) {
              echo ("Change Dir Failed: $dir<br />\r\n");
              return;
          }
          if (!(is_dir($dir)))
              mkdir($dir);
          chdir ($dir);
      }

      $contents = ftp_nlist($ftp_conn, ".");
      foreach ($contents as $file) {
     
          if ($file == '.' || $file == '..')
              continue;
         
          if (@ftp_chdir($ftp_conn, $file)) {
              ftp_chdir ($ftp_conn, "..");
              FTP::download($local_dir, $file, $ftp_conn);
          }
          else
              ftp_get($ftp_conn, "$local_dir/$file", $file, FTP_BINARY);
      }
         
      ftp_chdir ($ftp_conn, "..");
      chdir ("..");
  }

}