PHP and XML RPC – Searching for values

Many servers provide xmlrpc interfaces which allow other web applications to call and execute functions. It is actually quite simple once you get the hang of it. The servers also return the response and any variables as xmlrpc response messages which are xml responses basically

There are probably a lot of ways to get this done, but this actually turned out pretty well using a combination of the phpxmlrpc library and the Domdoc class in php.

Let us say that the server url is https://rpc.server.com/admin/admin at port 4567.
In order to make the call you first have to download the phpxmlrpc library from http://phpxmlrpc.sourceforge.net/ and extract it to a folder in your web directory root.

In the beginning you may want to turn the debugging feature of the rpc client on. To do uncomment the setDebug line in the code.

<?php

//error_reporting(E_ALL);

//ini_set("display_errors", 1);

require_once('xmlrpc-2.2.2/lib/xmlrpc.inc');

//You do not need to set the transport as https here.

$xmlrpc_client=new xmlrpc_client('admin/admin', 'rpc.server.com',4567);

//$xmlrpc_client->setDebug(1);

//An xmlrpc call without any parameters is below.

$xmlrpc_msg=new xmlrpcmsg('rpcFunctionName');

//the next one is an xmlrpc call with parameters.

//$xmlrpc_msg=new xmlrpcmsg('rpcFunctionName', array(new xmlrpcval(7, "int"),new xmlrpcval("", "string"),new xmlrpcval(2, "int")));

//Here is where you set the transport as https. Look at the manual for more options

$xmlrpc_resp=$xmlrpc_client->send($xmlrpc_msg, 200, 'https');

if ($xmlrpc_resp==False)

{

print "No response";

die ('Error');

}

if (!$xmlrpc_resp->faultCode())

{

//If you just want the xml, print out the return value from serialize()

//print $xmlrpc_resp->serialize() ;

$dom=new DomDocument();

$dom->loadXML($xmlrpc_resp->serialize());

//examine the xml to find out the path to the actual things you need.

$xpathString = "//methodResponse/params/param/value/struct/member[name='a_value']/value/string";

$xp=new DOMXPath($dom);

$domNodeList = $xp->query($xpathString);

foreach($domNodeList as $domNode){

//You may need to do more xpath queries as $xp->query($anotherXpathstr, $domNode). search will be done under $domNode

$server_name=$domNode->nodeValue ;

}

}

else

{

print "Error: " . $xmlrpc_resp->faultString();

}

?>

Also do look up the documentation for xmlrpc_client property return_type.