(PHP 5 >= 5.2.0)
XMLReader::readString — Reads the contents of the current node as a string
Reads the contents of the current node as a string.
此函数没有参数。
Returns the content of the current node as a string. Empty string on failure.
此函数仅在 PHP 与 libxml 20620 或以上版本编译时可用。