php|architect's Guide to Web Scraping with PHP - Wind Business ...

124 ” XMLReader Extension
false once it reaches the end of the document. As such, it’s perfect for use in a while
loop as shown above.
N o d e s
As in other extensions, each node has a type that is stored in the reader’s
nodeType property. The types in which you are generally interested are still elements
(XMLReader::ELEMENT) and attributes (XMLReader::ATTRIBUTE), possibly also
text (XMLReader::TEXT) and CDATA (XMLReader::CDATA) elements as well. Additionally,
the XMLReader extension has a node type for ending elements (i.e. closing tags),
XMLReader::END_ELEMENT. It s importance will become more obvious in the next section.
The example below shows how to check the node type against
an appropriate constant. F o r a list of these constants, see
http://php.net/manual/en/class.xmlreader.php#xmlreader.constants.
localName);
var_dump($doc->value);
var_dump($doc->hasValue);
}
}
?>
Also like other extensions, nodes have names. There are two properties for this, name
and localName. The former represents the fully qualified name, including the namespace
specification, while the latter represents the node name by itself and is the one
you will generally want to use.
Elements and Attributes
Attribute nodes can have values. When the iterator points to an attribute node, the
value property will be populated with the node’s value and the hasValue property can
be used to check for its presence.