Sams Teach Yourself PHP, MySQL® and Apache All in One

Q&A

Q1:

How do I use dynamic data to create the slices of a pie chart?

A1:

When creating any image, the start points and drawing lengths do not need to be statically indicated—they can be variables whose values are determined by a database, user input, or calculations within the script. For example, this code creates a red, filled arc of 90[dg]: ImageFilledArc($myImage, 50, 50, 100, 50, 0, 90, $red, IMG_ARC_PIE); You could set this up so that the red filled arc at the top of the pie will hold the percentage of the total for May Sales in a variable called $may_sales_pct. The line then becomes something like this: ImageFilledArc($myImage, 50, 50, 100, 50, 0, $may_sales_pct, $red, IMG_ARC_PIE); The number then is filled in from the calculations ...