PHP 5 in Practice

17. XML It's all you hear about these days: XMLExtensible Markup Language. In oversimplified terms, XML is basically a syntax that allows for the exchange of textual information between applications. The information is arranged in a treelike...

17.1. Parsing an XML File to Retrieve Data PHP actually provides a number of different ways to access the data from an XML document. The XML, XMLReader, and DOM XML extensions all offer different unique ways in which to navigate through an XML doc...

17.2. Performing Searches Through XML with XPath Directly accessing and traversing through an XML document, as described in Listing 17.1.1, is handy when you know the exact format and ordering of the document in question. Often you may be presen...

17.3. Validating an XML Document As shown in the previous examples, it is important that you understand the structure of an XML document to properly process it. This is why the concept of XML validation exists. You can use various proto-language...

17.4. Transforming XML into XHTML with XSLT XSL Transformations (or XSLT) are a manner in which you can turn an XML document directly into XHTML for display in a web browser. This is done via the creation of an XSL file, which is the XML equivalen...

17.5. Creating an RSS File RSS is a specific XML format that has been created for the sole purpose of syndicating "news" type information. It considers your information to be a channel and for that channel to have multiple items. Each it...

17.6. Creating an RSS Display Script for Websites RSS feeds are often used in nontraditional ways. Web browsers have various ways of displaying them, separate RSS software exists to read them, and even email clients are starting to display the o...