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122 ” XMLReader Extension Loading a Document The focal class of the XMLReader extension is aptly named XMLReader. It doesn’t declare a constructor, but rather offers two methods for introducing XML data into it. Both of these methods have two additional parameters. The second parameter is a string specifying the encoding scheme for the input document. It is optional and defaults to ’UTF-8’ if unspecified or specified as null. V a l i values d for this parameter aren’t included in the PHP manual, but can be found in the reference for the underlying libxml2 library at http://www.xmlsoft.org/encoding.html#Default. The third parameter is an integer value that can be set in bitmask fashion using constants from the libxml extension. This is the preferred method to configure the parser o v e r using the deprecated setParserProperty() method. The specific constants that can be used to form the bitmask (using the bitwise OR operator |) are listed below. Descriptions for them can be found at http://php.net/manual/en/libxml.constants.php. • LIBXML_COMPACT • LIBXML_DTDATTR • LIBXML_DTDLOAD • LIBXML_DTDVALID • LIBXML_NOBLANKS • LIBXML_NOCDATA • LIBXML_NOENT
XMLReader Extension ” 123 • LIBXML_NOERROR • LIBXML_NONET • LIBXML_NOWARNING • LIBXML_NSCLEAN • LIBXML_XINCLUDE As an example, a call that configured the parser to suppress errors and warnings might look like this. I t e r a t i o n The XMLReader instance acts as both an iterator o v e r the entire document as well as a data object for the current node pointed to by that iterator. It contains a set of read-only properties (described at http://php.net/manual/en/class.xmlreader.php#xmlreader.props) that represent those of the current node and are updated as the iterator position changes. The read() method attempts to move the iterator position to the next node and returns a boolean value indicating whether or not it was successful. That is, it returns
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php|architect’s Guide to Web Scra
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php|ar chitect’s Guide to W eb Sc
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vi ” CONTENTS Referring URLs . .
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viii ” CONTENTS HTTP Authenticati
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x ” CONTENTS Chapter 14 — PCRE
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xiv ” CONTENTS pleted. Each had a
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For ewor d W eb scraping is the fut
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Chapter 1 Introduction If you are l
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Introduction ” 3 in some instance
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Introduction ” 5 • Chapters 3-7
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PEAR::HTTP_Client ” 63 • sendRe
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