Book Image

RESTful PHP Web Services

By : Samisa Abeysinghe
Book Image

RESTful PHP Web Services

By: Samisa Abeysinghe

Overview of this book

<p>Representational State Transfer (REST) is a form of software architecture; systems that follow it are often called RESTful. It is the architectural style that drives the World Wide Web (the motivation for REST was to capture elements that made the Web successful), and RESTful web services use simple protocols already familiar to web developers. RESTful web services are found in lots of places with big name Web APIs such as Flickr, and Yahoo search following a REST-based approach.<br /><br />With any architectural style or approach, struggling with its basic concepts is just one problem – implementation in your favorite language is another, and that's where this book comes in. If you're a PHP developer, this book will show you how to create and consume RESTful web services in PHP, and make your services work well in the context of the Web.<br /><br />You will learn about the basic concepts of REST, and then look at PHP tools, libraries and techniques for working with RESTful web services. You will see how to use other RESTful services from your PHP applications, and also how to engineer your PHP applications to make them RESTful.<br /><br />This book is about implementing RESTful web services in PHP, and so the book is packed with example code and careful explanations.</p>

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RESTful PHP Web Services
Samisa Abeysinghe
Oct, 2008 | 220 pages
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Table of Contents (15 chapters)
RESTful PHP Web Services
RESTful PHP Web Services
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
Preface
Preface
Free Chapter
1
Introduction to REST
Introduction to REST
Programmable Web
HTTP and Web Services
What is REST?
HTTP Methods
The Need for RESTful Web Services
REST Tools and Frameworks in PHP
Summary
2
REST with PHP—A First Look
REST with PHP—A First Look
HTTP with PHP
Building the Request with XML Tools
Processing the Response
Consuming Flickr
Summary
3
REST in the Real World
REST in the Real World
Types of Services Available
Consuming Real-World Services
Mashups
Summary
4
Resource-Oriented Services
Resource-Oriented Services
Designing Services
Simplified Library System
System Implementation
Summary
5
Resource-Oriented Clients
Resource-Oriented Clients
Designing Clients
Resource Design
System Implementation
Summary
6
Resource-Oriented Clients and Services with Zend Framework
Resource-Oriented Clients and Services with Zend Framework
Installing Zend Framework
Services with Zend_Rest_Server
Clients with Zend_Rest_Client
Library System with Zend REST classes
Summary
7
Debugging REST Web Services
Debugging REST Web Services
Message Tracing
Errors in Building XML
Errors in Parsing XML
Best Practices
Summary
WSO2 Web Services Framework for PHP
WSO2 Web Services Framework for PHP
Installing WSF/PHP
Implementing Services
Implementing Clients
SOAP Service and Client
Summary
RESTClient class
RESTClient class
get Method
post Method
put Method
delete Method
Complete RESTClient Class
get Example
post Example
Yahoo Search Client Example
Summary
Index
Index

delete Method

The delete method takes two parameters, the service URL and request parameters to be used with delete request to the service.

As in the case of GET requests, we use the request parameters and build the URL with the request parameters in place.

        $params_str = "?";
if (is_array($params)) {
foreach ($params as $key => $value) {
                $params_str .= urlencode($key) . "=" . urlencode($value) . "&";
            }
} else {
            $params_str .= $params;
        }

        $url .= $params_str;

Then if CURL is present, we send the DELETE request to the service URL with CURL.

if ($this->with_curl) {
            $curl = curl_init();
            curl_setopt($curl, CURLOPT_URL, $url);
            curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "delete");
            curl_setopt($curl, CURLOPT_USERAGENT, RESTClient :: USER_AGENT);
            $result = curl_exec($curl);
            curl_close($curl);
        }

If CURL is not present, we use the fopen logic.

        } else {
            $opts = array (
                'http' => array (
                    'method' => "DELETE",
                    'header' => "User-Agent: " . RESTClient :: USER_AGENT . "\r\n"
                )
            );

            $context = stream_context_create($opts);

            $fp = fopen($url, 'r', false, $context);
            $result = fpassthru($fp);
            fclose($fp); 


        }
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