Web Technology Experts Notes

Tuesday, 13 January 2015

How to create webservice in php with SOAP Technology

Here we will learn how to create a SOAP based web service and know how to use a web service created with SOAP.

For creating webservice you must know the basics of following.
What is Web Services
Web Services is Interaction between two machines over a network. It use SOAP, REST, and XML-RPC as a means of communication. A Web service always needs a network for its operation.
Know Difference between WebService and API

What is SOAP
SOAP stands for Simple Object Access Protocol. SOAP is an XML-based protocol for exchanging information between two computers over the internet. It enables you to Remote Procedure Calls (RPC) transported via HTTP.
More About SOAP

Now Follow the following Simple Steps:
1. Donwnload the library File from http://sourceforge.net/projects/nusoap/.
2. Unzip/extract the downloaded zip file.
3. Copy the "lib" folder from unziped folder and past in root folder of your project.
Suppose your project is myproject:
Project Location: D:\wamp\www\myproject
Library Location: D:\wamp\www\myproject\lib
4.Create two files soapServer.php and soapClient.php into myproject folder.
5. Add Following code in soapServer.php

/* Include library file **/ 
require_once ('lib/nusoap.php'); 

/** create the object of SoapServer **/
$serverObj = new soap_server;
$namespace = 'http://localhost/myproject/soapServer.php?wsdl';
$serverObj->configureWSDL('get_messageString', $namespace); 

//register a function that works on server 
$serverObj->register('get_message'); 

// create the function 
function get_message($your_name) 
{ 
return "Hello {$your_name}!"; 
} 

if ( !isset( $HTTP_RAW_POST_DATA ) ){
  $HTTP_RAW_POST_DATA =file_get_contents('php://input' );
} 
// create HTTP listener 
$serverObj->service($HTTP_RAW_POST_DATA);

6. Add Following code in soapClient.php

require_once ('lib/nusoap.php'); 
//Give it value at parameter 
$param = array( 'your_name' => 'Web Technology Experts Notes');

try{
      //Create object that referer a web services 
    $clientObj = new soapclient('http://localhost/myproject/soapServer.php'); 
    //Call a function at server and send parameters too 
    $response = $clientObj->call('get_message',$param); 
    //Process result 
    if($clientObj->fault){ 
      echo "FAULT: Code: ($clientObj->faultcode)"; 
      echo "String: ".$clientObj->faultstring; 
    }else { 
      echo $response; 
      } 
}catch(Exception $e){
    echo $e->getMessage();
}

7. soapClient.php will use as client whereas soapServer.php will be used as server.