Soap Making Classes

Introduction to SOAP Web Services with PHP5

Note that while services such as Google and PEAR SOAP are technically still in beta, so you can find the odd mistake from time to time. There are other SOAP client libraries available, including the PHP5 SOAP extension and NuSOAP, and while implementation details are different, the basic theory is the same as that presented here.

Setting up the PEAR SOAP module

Before we can start using SOAP, it is better to ensure that both himself and the PEAR SOAP module are available. The PEAR package manager is installed by default with PHP 4.3.0 and later, but if you are using an older version or not in the system check the PEAR manual.

Once you've installed the package manager, which have to download the SOAP package. In most systems, you can just enter pear install SOAP into a console window. At least that's the theory. A Unless there is a stable version of SOAP available, you get the message in any stable release to the state equal to that found for SOAP. Try pear install SOAP beta to obtain the most current version of the package at the time of writing, although it is in beta, or tell PEAR to accept without complaint betas writing beta pear config set preferred state.

You can also get one or more messages from package requires, followed by Dependencies. In this case, try the pear install command again but add the dependencies of the command line. For example, if PEAR complained that the net DIME package is missing, try using pear DIME net install instead of SOAP.

Obtain a license key

Once you have installed the SOAP module, the next step is to download the Web APIs Google Developers Kit and registration to get a license key. This button allows you to 1000 SOAP requests per day for free. Visit Google Web API HTTP API www.google.co.uk and follow the instructions on the site.

Extracting the developer kit and put it in a convenient location. It contains samples for accessing the service. NET and Java but most of the documentation that applies equally to call Google from PHP.

Decoding the WSDL file

In the developer kit main directory is called GoogleSearch.wsdl a WSDL file, which can be opened in a text editor or XML browser. This file defines exactly what services we can call via SOAP, but documentation from Google is probably easier to read.

However, we can also see what the SOAP module makes this file. Create a new page and enter the following PHP.

We once SOAP Client.php
WSDL SOAP WSDL GoogleSearch.wsdl.
Content-Type header plain text
generateProxyCode echowsdl.

Location somewhere in your server along with GoogleSearch.wsdl and access through your web browser. Assuming everything is working well, you should get a lot of output in php. This code is the result of the client class to SOAP WSDL analyze the WSDL file and convert it to PHP functions. This tells us what we can call functions in a rather more readable than the WSDL document, and is particularly useful if you are using a WSDL service poorly documented.

So how does the code let s go through it step by step.

1. First Instead, load the SOAP client. If this gives an error, it probably means SOAP isn't installed correctly and you should read the instructions above or PEAR Manual.

2. Then create an instance of the class of SOAP WSDL based on the file GoogleSearch.wsdl. This is one of the main classes we will use throughout this tutorial analyzes the WSDL file and represents as PHP.

3. Finally, the output of the proxy code as plain text. As can be seen at the start, SOAP the proxy is a class that represents the WSDL calls available as PHP functions.

Spell checking with Google

If you've been using Google for a time and type as erratically as me, you probably noticed You mean the line that appears if you misspell a word in a search. Thanks to the service Google web spell checker can add this to our PHP applications but to be honest, it would probably be better to use pspell in a real application. Type the following code, with its own license key as the first string.

, T Simple is not the first line is trivial and the following two are the same as the previous example. The fourth line creates the proxy object based on the code we've seen, so you can make SOAP requests by calling its methods. Finally, we call doSpellingSuggestion and output the result. Access to this page on your web browser, and you should see the word dictionary on their own.

You may see instead of objects, in which case SOAP has encountered a problem and returns a SOAP fault. We shall see in dealing with these failures in a time in the future, but for now check if you have entered the correct license key and not managed to fill its 1000 queries per day limit.

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