(PHP 4 >= 4.0.5, PECL pdflib >= 1.0.0)
PDF_setcolor — Set fill and stroke color
$p
    , string $fstype
    , string $colorspace
    , float $c1
    , float $c2
    , float $c3
    , float $c4
    )
   Sets the current color space and color. Returns TRUE on success or FALSE on failure.