(PHP 4, PECL pdflib >= 1.0.0)
PDF_setgray_stroke — Set stroke color to gray [deprecated]
$p
    , float $g
    )
   Sets the current stroke color to a gray value between 0 and 1 inclusive.
   Returns TRUE on success or FALSE on failure.
  
This function is deprecated since PDFlib version 4, use PDF_setcolor() instead.