在线手册：中文英文

PDF_setgray

(PHP 4, PECL pdflib >= 1.0.0)

PDF_setgray — Set color to gray [deprecated]

bool PDF_setgray ( resource $p , float $g )

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.

在线手册：中文英文

PHP手册 - N: Set color to gray [deprecated]

leea at digitus dot com dot au (30-Jan-2001 03:37)

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