(PHP 4 >= 4.0.6, PHP 5)
imagesetthickness() sets the thickness of the lines drawn when drawing rectangles, polygons, ellipses etc. etc. to thickness pixels.
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
Nota: This function requires GD 2.0.1 or later.