(PECL ps >= 1.1.0)
ps_setlinewidth — Sets width of a line
$psdoc
   , float $width
   ) : boolSets the line width for all following drawing operations.
psdocResource identifier of the postscript file as returned by ps_new().
widthThe width of lines in points.
   成功时返回 TRUE, 或者在失败时返回 FALSE。