(PHP 5 <= 5.3.0, PECL ming SVN)
SWFMovie::saveToFile —
$x
   [, int $compression = -1
  ] )This function is currently not documented; only its argument list is available.
X
compressionThe compression level can be a value between 0 and 9, defining the SWF compression similar to gzip compression.
This parameter is only available as of Flash MX (6).
   Return the number of bytes written or FALSE on error.