A comprehensive tutorial explaining in great details the methods of implementing the full set of API functionality for Google Search, using PHP. Sample app, and downloadable scripts demonstrate every aspect of the subject matter presented in the tutorial.
Tutorial Details:
Google Search API, PHP and some fun!
It?s old news, but for those who?ve been living in a cave, Google has a search API (launched back in the summer of 2002), that you can access via any programming language to add search functionality to your web apps. Long back, I decided to build a PHP application for that, and for those who wanna have some fun with it, and learn some web services api programming with php et. al. I?ve put down an article along with a sample app and some scripts that you can download and tweak to your heart?s content.
Signing up for a developer license
The very first thing that you would want to do is to sign up for a Google Web API developer?s license and acquire a license key. This is an absolute necessity, as every search request sent to the google server through your application would have to send your key with it. This is done so as to restrict you to a maximum number of search requests for a given time frame, which has been set at 1000 queries for a 24-hour period.
Once you?ve signed up and received your license key, take good care of it, don?t lose it or share it with anyone. You should also download the API developer?s kit, which contains API usage examples, and a very important piece of data: a WSDL file, which actually defines the web service. Before, we go any further, we will briefly look at a few buzzwords surrounding web services in general.
WSDL, SOAP and the rest of the gang
WSDL, an acronym for Web Services Description Language, is a simple XML document that defines a web service: where it is located, what it does, the format of the request that it expects, the format of the response that it generates and a whole host of other things that we will learn in a short while.
Since the Google API functionality is exposed via a web service, in order to actually query this service a series of SOAP based request-response remote procedure calls would have to be executed at both ends of the communication line - at your end as the consumer of the web service, and at Google?s end as the service provider.
SOAP therefore is responsible for handling the lower level details of encapsulating and delivering data from a client to a server, and vice versa. This communication happens over the simple HTTP protocol, and thus facilitates the building of nice web applications with the Google API, using a scripting language like PHP, and a SOAP client library.
The Process
A web services client encapsulates a request, translating it into a format suitable for consumption by a web service and relays this request over HTTP to the SOAP server. The SOAP server decodes the SOAP request containing the procedure calls to execute, executes them, packages it?s response as a SOAP packet, and hands over the packet back to the client. The client then translates this packet into a format that can be used by the application.
This process, as you can see, is fairly straight forward. In fact the availability of easy-to-use SOAP client libraries in PHP makes developing Google API applications a breeze, as we shall presently see.
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