You only appear to be able to add up to 8 entries per gradient
(PHP 5 <= 5.3.0, PECL ming SVN)
SWFGradient::addEntry — Adds an entry to the gradient list
$alpha= 255 ] )
This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.
swfgradient::addentry() adds an entry to the gradient list.
ratio is a number between 0 and 1 indicating where in
the gradient this color appears. Thou shalt add entries in order of increasing ratio.
is a color (RGB mode).
No value is returned.