(PHP 3>= 3.0.8, PHP 4 >= 4.0.0)
cpdf_setgray_fill -- Sets filling color to gray value
Description
void 
cpdf_setgray_fill ( int pdf document, float value)
     The cpdf_setgray_fill() function sets the current
     gray value to fill a path.
    
     See also cpdf_setrgbcolor_fill().