To extract data from an XML-RPC response and transform them into PHP variables, we will use xmlrpc_encode_request()'s complementary function, xmlrpc_decode(). xmlrpc_encode_request() was smart enough to take variables, whether they are primitive variables, arrays, or structures, and transform them into an XML-RPC request.
xmlrpc_decode() will take an XML-RPC response, look for the type of data being returned for example, whether they are simple primitives, structures, or arrays, and return either a straight PHP value (if primitive) or an array of values (if they are an XML-RPC struct or array). xmlrpc_decode() will also process XML-RPC response errors. Using another function, xmlrpc_is_fault(), we can evaluate the return value to see if it is an error and handle them accordingly.
Let’s create a function to demonstrate both xmlrpc_decode() and xmlrpc_is_fault().
function processXMLRPCResponse($xmlrpcResponse) {
$data = xmlrpc_decode($xmlrpcResponse);
if (xmlrpc_is_fault...