How This Book Is Structured
For you to get the most out of XML and Web services in PHP, this book is really grouped into three sections. The first section contains terminology and technical information about XML. This includes the concepts and structure of an XML document, validation, and other XML technologies commonly used. The chapters covering this information are based on various specifications. These specifications often use cryptic language and are difficult to understand, so I distill the information in clear terms.
The next group of chapters covers how to parse and manipulate XML documents using some of the extensions in PHP. I explain each extension and its API in detail with real-world examples to help reenforce the concepts covered. I also compare and contrast the extensions, providing you with some insight about where a particular extension excels and how it may not be the correct one to use in a particular situation.
The last group of chapters covers Web services. Although only a single native Web service extension exists in PHP (SOAP), I will provide in-depth coverage of additional technologies using
the extensions from earlier chapters. In addition, I will cover how to integrate with the Yahoo, Google, Amazon, and eBay Web services. Specifically, the chapters break down as follows:
Chapter 1, “Introduction to XML and Web Services”: This chapter provides some background information about XML and Web services. In addition, the chapter defines what these terms mean, explains the history of how they came about, and shows some examples of how XML is used in the real world.
Chapter 2, “XML Structure”: The XML 1.0 specification defines what XML is and the structure of documents but uses language that is not always so straightforward. This chapter explains the structure of an XML document in simple terms and provides some lucid examples. In addition, this chapter introduces some terminology used throughout the book.
Chapter 3, “Validation”: This chapter explains the use of validation in XML using Document Type Definitions (DTDs), XML Schemas, and RELAX NG.
Chapter 4, “XPath, XPointer, XInclude, and the Future”: The focus of this chapter is explaining how to write XPath expressions to query an XML document. You can use XPath with a few of the PHP extensions, and XPath serves as the foundation for XSLT in Chapter 10. The chapter also explains both XPointer and XInclude, which allow for more advanced XML processing.
Chapter 5, “PHP and XML”: This chapter introduces the new XML support in PHP 5.
It explains much of the functionality shared by the XML-based extensions, such as parser options, error handling, PHP streams, and document encoding.
Chapter 6,“Document Object Model (DOM)”: This chapter provides an in-depth look at using the DOM extension and shows how it is used to manipulate an XML document.
Chapter 7, “SimpleXML”: The SimpleXML extension provides a simple interface for working with XML documents. This chapter explains how to use the extension to access virtually any type of XML document, including more complex ones that use namespaces.
Chapter 8, “Simple API for XML (SAX)”: This chapter explains how to work with the xml extension and covers issues you may encounter when migrating an application that uses this extension from PHP 4 to PHP 5.
Chapter 9, “XMLReader”: The XMLReader extension is a lightweight parser and an alternative to the xml extension covered in Chapter 8. This chapter explains and demonstrates how to process an XML document using this extension.
Chapter 10, “Extensible Stylesheet Language Transformation (XSLT)”: You can transform XML documents using XSLT. This chapter begins by explaining the XSLT specification in easy-to-understand terms. Then, this chapter shows how to use the XSL extension in PHP to perform transformations.
Chapter 11, “Effective and Efficient Processing”: With a number of different extensions that can be used to work with XML in PHP, it is often difficult to decide which one to use. This chapter explains the differences between the extensions and continues with tips and tricks that can be used to optimally work with XML in PHP.
Chapter 12, “XML Security”: Data integrity and data security are topics that every developer must be concerned with when writing applications. In this chapter, you will learn how to work with digital signatures and encryption as they pertain to XML.
Chapter 13, “PEAR and XML”: The PHP Extension and Application Repository (PEAR) is a collection of software that can be used when writing an application. This chapter introduces PEAR and explores some of the XML packages it provides.
Chapter 14, “Content Syndication: RSS and Atom”: Content syndication has become popular with the explosion of weblogs (blogs). This chapter examines the three formats that are used to syndicate data and shows how to create and consume syndicated feeds using the PHP extensions.
Chapter 15, “Web Distributed Data Exchange (WDDX)”: This chapter explains what WDDX is and how you can use the wddx extension to exchange data between systems.
Chapter 16, “XML-RPC”: This chapter examines the structure and exchange of XML-RPC documents. You will then learn about the xmlrpc extension and how you can use it to communicate with remote systems.
Chapter 17, “Representational State Transfer (REST)”: Representational State Transfer (REST) is a simple method to create and consume Web services. I demonstrate how to create and consume REST-based services. In particular, you will see how to consume some real services from both Yahoo and Amazon.
Chapter 18, “SOAP”: SOAP allows for the creation of complex Web services. The specifications involved are also quite complex. In this chapter, I show examples of both the Web Services Description Language (WSDL) specification and the SOAP specification. Using this knowledge, you will see how to use the SOAP extension in PHP using realworld examples from eBay and Google.
Chapter 19,“Universal Description,Discovery, and Integration (UDDI)”: UDDI is a technology meant to make working with Web services easier. This chapter shows how you can use PHP to access and maintain records in a UDDI registry.
Chapter 20, “PEAR and Web Services”: Chapter 13 introduces PEAR and its XML packages;this chapter introduces you to some packages that you can use to create and consume a variety of Web services.
Chapter 21, “Other XML Technologies and Extensions”: There are too many XML-based technologies to cover in a single book. In this chapter, I will introduce you to the XMLWriter and SDO XML Data Access Service extensions as well as show how to work with Ajax and Wireless Application Protocol (WAP) using PHP.
DOWNLOAD THIS BOOK
For you to get the most out of XML and Web services in PHP, this book is really grouped into three sections. The first section contains terminology and technical information about XML. This includes the concepts and structure of an XML document, validation, and other XML technologies commonly used. The chapters covering this information are based on various specifications. These specifications often use cryptic language and are difficult to understand, so I distill the information in clear terms.
The next group of chapters covers how to parse and manipulate XML documents using some of the extensions in PHP. I explain each extension and its API in detail with real-world examples to help reenforce the concepts covered. I also compare and contrast the extensions, providing you with some insight about where a particular extension excels and how it may not be the correct one to use in a particular situation.
The last group of chapters covers Web services. Although only a single native Web service extension exists in PHP (SOAP), I will provide in-depth coverage of additional technologies using
the extensions from earlier chapters. In addition, I will cover how to integrate with the Yahoo, Google, Amazon, and eBay Web services. Specifically, the chapters break down as follows:
Chapter 1, “Introduction to XML and Web Services”: This chapter provides some background information about XML and Web services. In addition, the chapter defines what these terms mean, explains the history of how they came about, and shows some examples of how XML is used in the real world.
Chapter 2, “XML Structure”: The XML 1.0 specification defines what XML is and the structure of documents but uses language that is not always so straightforward. This chapter explains the structure of an XML document in simple terms and provides some lucid examples. In addition, this chapter introduces some terminology used throughout the book.
Chapter 3, “Validation”: This chapter explains the use of validation in XML using Document Type Definitions (DTDs), XML Schemas, and RELAX NG.
Chapter 4, “XPath, XPointer, XInclude, and the Future”: The focus of this chapter is explaining how to write XPath expressions to query an XML document. You can use XPath with a few of the PHP extensions, and XPath serves as the foundation for XSLT in Chapter 10. The chapter also explains both XPointer and XInclude, which allow for more advanced XML processing.
Chapter 5, “PHP and XML”: This chapter introduces the new XML support in PHP 5.
It explains much of the functionality shared by the XML-based extensions, such as parser options, error handling, PHP streams, and document encoding.
Chapter 6,“Document Object Model (DOM)”: This chapter provides an in-depth look at using the DOM extension and shows how it is used to manipulate an XML document.
Chapter 7, “SimpleXML”: The SimpleXML extension provides a simple interface for working with XML documents. This chapter explains how to use the extension to access virtually any type of XML document, including more complex ones that use namespaces.
Chapter 8, “Simple API for XML (SAX)”: This chapter explains how to work with the xml extension and covers issues you may encounter when migrating an application that uses this extension from PHP 4 to PHP 5.
Chapter 9, “XMLReader”: The XMLReader extension is a lightweight parser and an alternative to the xml extension covered in Chapter 8. This chapter explains and demonstrates how to process an XML document using this extension.
Chapter 10, “Extensible Stylesheet Language Transformation (XSLT)”: You can transform XML documents using XSLT. This chapter begins by explaining the XSLT specification in easy-to-understand terms. Then, this chapter shows how to use the XSL extension in PHP to perform transformations.
Chapter 11, “Effective and Efficient Processing”: With a number of different extensions that can be used to work with XML in PHP, it is often difficult to decide which one to use. This chapter explains the differences between the extensions and continues with tips and tricks that can be used to optimally work with XML in PHP.
Chapter 12, “XML Security”: Data integrity and data security are topics that every developer must be concerned with when writing applications. In this chapter, you will learn how to work with digital signatures and encryption as they pertain to XML.
Chapter 13, “PEAR and XML”: The PHP Extension and Application Repository (PEAR) is a collection of software that can be used when writing an application. This chapter introduces PEAR and explores some of the XML packages it provides.
Chapter 14, “Content Syndication: RSS and Atom”: Content syndication has become popular with the explosion of weblogs (blogs). This chapter examines the three formats that are used to syndicate data and shows how to create and consume syndicated feeds using the PHP extensions.
Chapter 15, “Web Distributed Data Exchange (WDDX)”: This chapter explains what WDDX is and how you can use the wddx extension to exchange data between systems.
Chapter 16, “XML-RPC”: This chapter examines the structure and exchange of XML-RPC documents. You will then learn about the xmlrpc extension and how you can use it to communicate with remote systems.
Chapter 17, “Representational State Transfer (REST)”: Representational State Transfer (REST) is a simple method to create and consume Web services. I demonstrate how to create and consume REST-based services. In particular, you will see how to consume some real services from both Yahoo and Amazon.
Chapter 18, “SOAP”: SOAP allows for the creation of complex Web services. The specifications involved are also quite complex. In this chapter, I show examples of both the Web Services Description Language (WSDL) specification and the SOAP specification. Using this knowledge, you will see how to use the SOAP extension in PHP using realworld examples from eBay and Google.
Chapter 19,“Universal Description,Discovery, and Integration (UDDI)”: UDDI is a technology meant to make working with Web services easier. This chapter shows how you can use PHP to access and maintain records in a UDDI registry.
Chapter 20, “PEAR and Web Services”: Chapter 13 introduces PEAR and its XML packages;this chapter introduces you to some packages that you can use to create and consume a variety of Web services.
Chapter 21, “Other XML Technologies and Extensions”: There are too many XML-based technologies to cover in a single book. In this chapter, I will introduce you to the XMLWriter and SDO XML Data Access Service extensions as well as show how to work with Ajax and Wireless Application Protocol (WAP) using PHP.
DOWNLOAD THIS BOOK
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