The array is in a format that can be directly used in BaseChart.gradientColor2 and DrawArea.gradientColor2. Its contents (in hex) is:
00 FFE743 60 FFFFE0 B0 FFF0B0 100 FFE743
See Color Specification on how colors are represented in ChartDirector.
ChartDirector 5.1 (PHP Edition)
phpchartdir.goldGradient
Description