fixes RPC client/server

Author: videlalvaro

php/rpc_client.php

@@ -22,7 +22,7 @@ public function __construct() {
 			array($this, 'on_response'));
 	}
 	public function on_response($rep) {
-		if($rep->properties['correlation_id'] == $this->corr_id) {
+		if($rep->get('correlation_id') == $this->corr_id) {
 			$this->response = $rep->body;
 		}
 	}

php/rpc_server.php

@@ -24,11 +24,11 @@ function fib($n) {
 
 	$msg = new AMQPMessage(
 		(string) fib($n),
-		array('correlation_id' => $req->properties['correlation_id'])
+		array('correlation_id' => $req->get('correlation_id'))
 		);
 
 	$req->delivery_info['channel']->basic_publish(
-		$msg, '', $req->properties['reply_to']);
+		$msg, '', $req->get('reply_to'));
 	$req->delivery_info['channel']->basic_ack(
 		$req->delivery_info['delivery_tag']);
 };