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(PECL pdflib >= 2.0.0)
PDF_shading — Define blend
$pdfdoc
, string $shtype
, float $x0
, float $y0
, float $x1
, float $y1
, float $c1
, float $c2
, float $c3
, float $c4
, string $optlist
)Defines a blend from the current fill color to another color.
This function requires PDF 1.4 or above.