bool imagearc ( resource image, int cx, int cy, int w, int h, int s, int e, int color )
imagearc() draws a partial ellipse centered at
cx, cy (top left is
0, 0) in the image represented by image.
and h specifies the ellipse's width and
height respectively while the start and end points are specified
in degrees indicated by the s and
e arguments. 0° is located at the three-o'clock
position, and the arc is drawn clockwise.
Example 1. Drawing a circle with imagearc()
// create a 200*200 image $img = imagecreatetruecolor(200, 200);