(PHP 5 < 5.3.0, PECL ming SVN)
$compression= -1 ] ) : int
This function is currently not documented; only its argument list is available.
The 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.