(PHP3 , PHP4 )
ImageRectangle -- Draw a rectangle
Description
int imagerectangle (int im, int x1, int y1, int x2, int y2, int col)
    
     ImageRectangle() creates a rectangle of color
     col in image im starting at upper left coordinate x1, y1 and
     ending at bottom right coordinate x2, y2.  0, 0 is the top left
     corner of the image.