You only appear to be able to add up to 8 entries per gradient
PHP - Manual: SWFGradient::addEntry
2025-10-30
(PHP 5 < 5.3.0, PECL ming SVN)
SWFGradient::addEntry — Adds an entry to the gradient list
$ratio
   , int $red
   , int $green
   , int $blue
   [, int $alpha = 255
  ] ) : void此函数是实验性的。此函数的表象,包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担 。
   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. 
  
   red, green, blue
   is a color (RGB mode).
  
没有返回值。
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You only appear to be able to add up to 8 entries per gradient