(PECL ps >= 1.1.0)
ps_setflat — Sets flatness
$psdoc
, float $value
)
本函数还未编写文档，仅有参数列表。
psdocResource identifier of the postscript file as returned by ps_new().
value
The value must be between 0.2 and 1.
成功时返回 TRUE， 或者在失败时返回 FALSE。