For More Information: www.packtpub.com/restful-php-web-services/book
Chapter 5 covers the steps that you would have to follow in designing and implementing
resource-oriented clients in detail. The design of the clients is governed by the design of
the service. And the client programmer needs to understand the semantics of the service,
which is usually communicated through service API documentation. In the examples of
this chapter, we will use the library service API designed in Chapter 4 to explain how we
could use an existing API while designing PHP applications.
Chapter 6 uses the REST classes provided with the Zend Framework to implement the
sample library system. The design of the service and client are covered, along with the
MVC concepts supported by the Zend Framework. We will discuss how resources map to
the model in MVC, and how HTTP verbs when combined with resource URIs map to the
controller in MVC. We will explore how to combine Zend_Rest_Server with
Zend_Controller to implement the business operations of the service and how to use
Zend_Rest_Client class to consume the services.
Chapter 7 looks into the use of tools to trace and look into the messages to figure out
possible problems with request and response pairs passed between clients and services.
That helps with debugging and troubleshooting of services and clients. We will also look
into how we could look at the XML documents to figure out possible problems in
building XML in this chapter, and discuss how we can locate problems in parsing
incoming XML messages.
Appendix A introduces the WSO2 Web Services Framework for PHP (WSO2 WSF/PHP)
and discusses how to use the WSF/PHP service API to implement the sample Library
system as a REST service and implement a REST client to consume it. We will also look
into using the SOAP features provided in the frameworks to implement a SOAP client to
consume the same service using SOAP-style messages. This chapter also discusses the
differences between REST and SOAP message styles, in brief.
Appendix B introduces a PHP class named RESTClient that can be used to consume
REST-style services. This class supports all key HTTP verbs,
GET, POST, PUT, and
DELETE. The advantage of using such a class is that it minimizes the complexity of your
client code. At the same time, you can re-use this class for all your REST-style client
implementations. This PHP class is sufficient for most simple REST-style client
programs, and requires no third-party libraries. However, if you want to implement
services and also want advanced clients, it is advised to use a more established
framework such as Zend Framework or WSO2 WSF/PHP introduced in Chapter 6 and
Appendix A of this book.
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