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我正在使用 PHP 和 Zend_PDF 在线生成 PDF 文档。我怎样才能给这些文件加上时间戳并添加数字签名？也可以使用另一个库进行时间戳记。目前我刚刚找到商业产品！
Zend Framework does not support the creation of digital certificates for PDF files. See the following link for more information, along with a link to a free third party solution:
http://www.framework.zend.com/issues/browse/ZF-10950