Creates a rectangle filled with color in the given
image starting at point 1 and ending at point 2.
0, 0 is the top left corner of the image.
An image resource, returned by one of the image creation functions,
such as imagecreatetruecolor().
x-coordinate for point 1
y-coordinate for point 1
x-coordinate for point 2
y-coordinate for point 2
The fill color. A color identifier created with
TRUE on success or
FALSE on failure.