PDF_setgray()

(PHP 4, PECL pdflib >= 1.0.0)

Set color to gray[deprecated]

说明

PDF_setgray(resource $p,float $g): bool

Sets the current fill and stroke color to a gray value between 0 and 1 inclusive.成功时返回TRUE，或者在失败时返回FALSE。

This function is deprecated since PDFlib version 4, use PDF_setcolor() instead.

pdf_setgray double values start at 0 for black and end at 1 for white so for any shade of gray simply pick a value inbetween these 2 numbers