(PHP 3 >= 3.0.8, PHP 4, PHP 5 <= 5.0.4)
Saves the current environment. It works like the postscript command gsave. Very useful if you want to translate or rotate an object without effecting other objects.
pdf_document
The document handle, returned by cpdf_open().
如果成功则返回 TRUE，失败则返回 FALSE。
