(PHP 5 >= 5.1.2, PECL xmlwriter >= 0.1.0)
XMLWriter::startDocument — Create document tag
Object oriented style:
Procedural style:
Starts a document.
仅用于过程调用。resource 是被修改的 XMLWriter 资源。此资源来自对 xmlwriter_open_uri() 或 xmlwriter_open_memory() 的调用
The version number of the document as part of the XML declaration. Defaults to 1.0.
The encoding of the document as part of the XML declaration. NULL by default.
yes or no. NULL by default.
如果成功则返回 TRUE,失败则返回 FALSE。