(3.0.8 - 3.0.18 only, PHP 4 >= 4.0.0)
void cpdf_setgray (int pdf document, float gray value)
void cpdf_setgray
The cpdf_setgray_stroke() function sets the current drawing and filling color to the given gray value.
See also cpdf_setrgbcolor_stroke(), cpdf_setrgbcolor_fill().