(PECL ps >= 1.1.0)
ps_open_file — Opens a file for output
$psdoc, string $filename = ?): boolCreates a new file on disk and writes the PostScript document into it. The file will be closed when ps_close() is called.
psdocResource identifier of the postscript file as returned by ps_new().
filename
The name of the postscript file.
If filename is not passed the document will be
created in memory and all output will go straight to the browser.
成功時(shí)返回 true， 或者在失敗時(shí)返回 false。