fpdf.rect(float x, float y, float w, float h [, string style])

Outputs a rectangle. It can be drawn (border only), filled (with no border) or both.

x:

Abscissa of upper-left corner. y: Ordinate of upper-left corner. w: Width. h: Height. style: Style of rendering. Possible values are:

D or empty string: draw. This is the default value. F: fill DF or FD: draw and fill

Cell.