一、概述及安装

The XMLReader extension is an XML Pull parser. The reader acts as a cursor going forward on the document stream and stopping at each node on the way.

It is important to note that internally, libxml uses the UTF-8 encoding and as such, the encoding of the retrieved contents will always be in UTF-8 encoding.

此扩展需要 libxml PHP 扩展。这表示需要使用 --enable-libxml ，尽管这将隐式完成因为 libxml 是缺省开启的。

The XMLReader extension was initially a PECL extension for PHP 5. It was later moved to the PHP source (bundled) as of PHP 5.1.0, and later enabled by default as of PHP 5.1.2.

此扩展默认为启用,编译时可通过下列选项禁用： --disable-xmlreader

二、XMLReader类及其成员函数

XMLReader::close — Close the XMLReader input

XMLReader::expand — Returns a copy of the current node as a DOM object

XMLReader::getAttribute — Get the value of a named attribute

XMLReader::getAttributeNo — Get the value of an attribute by index

XMLReader::getAttributeNs — Get the value of an attribute by localname and URI

XMLReader::getParserProperty — Indicates if specified property has been set

XMLReader::isValid — Indicates if the parsed document is valid

XMLReader::lookupNamespace — Lookup namespace for a prefix

XMLReader::moveToAttribute — Move cursor to a named attribute

XMLReader::moveToAttributeNo — Move cursor to an attribute by index

XMLReader::moveToAttributeNs — Move cursor to a named attribute

XMLReader::moveToElement — Position cursor on the parent Element of current Attribute

XMLReader::moveToFirstAttribute — Position cursor on the first Attribute

XMLReader::moveToNextAttribute — Position cursor on the next Attribute

XMLReader::next — Move cursor to next node skipping all subtrees

XMLReader::open — Set the URI containing the XML to parse

XMLReader::read — Move to next node in document

XMLReader::readInnerXML — Retrieve XML from current node

XMLReader::readOuterXML — Retrieve XML from current node, including it self

XMLReader::readString — Reads the contents of the current node as a string

XMLReader::setRelaxNGSchema — Set the filename or URI for a RelaxNG Schema

XMLReader::setRelaxNGSchemaSource — Set the data containing a RelaxNG Schema

XMLReader::setSchema — Validate document against XSD

XMLReader::XML — Set the data containing the XML to parse