I used PHPExcel to generate chart i done that for generating of bar chart, so now what i want to do is to generate pie chart with the bar (column) chart. For example my bar chart display total student of each course, now i want to draw pie chart to show each category of student for each course. suppose course CCNA has 40 student which displayed in bar chart, now i should display the number of student above the 20 years and below the 20 years age in pie chart at the top of each related column in bar chart.
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