14. XML and PHP
XML, the Extensible Markup Language, is one of the most used technologies for sharing data between computers and applications. XML provides a format for storing not just information but also information about the information (aka meta-information). XML, like HTML, is based on Standard Generalized Markup Language, or SGML, which means that you’ll see numerous similarities between the two (in fact, XHTML, is a combination of them). Early versions of PHP supported XML, PHP 4 improved upon that support, and PHP 5 took things even further.
This chapter begins with a basic introduction to XML: what it is, the proper XML syntax, and how to make your own XML document. From there, PHP will take over, both for reading and creating XML ...
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