How to use this php class - php

Question

I need to use the functions of this class,I wrote a code but the output was empty,need echo data from all functions.
I correctly entered the connection requirements,script use Json-rpc for request,The port is open on the server
I don't know how to use this class
my class
<?php
require_once("jsonrpc.inc");
class IBSjsonrpcClient {
function IBSjsonrpcClient($server_ip="127.0.0.1", $auth_name="user", $auth_pass="pass", $auth_type="ADMIN", $server_port="1237", $timeout=1800){
$this->client = new jsonrpc_client($server_ip. ':' . $server_port);
$this->auth_name = $auth_name;
$this->auth_pass = $auth_pass;
$this->auth_type = $auth_type;
$this->timeout = $timeout;
}
function sendRequest($server_method, $params_arr){
/*
Send request to $server_method, with parameters $params_arr
$server_method: method to call ex admin.addNewAdmin
$params_arr: an array of parameters
*/
$params_arr["auth_name"] = $this->auth_name;
$params_arr["auth_pass"] = $this->auth_pass;
$params_arr["auth_type"] = $this->auth_type;
$response = $this->client->send($server_method, $params_arr, $this->timeout);
$result = $this->__returnResponse($response);
unset($response);
return $result;
}
function __returnResponse($response){
if ($response == FALSE)
return $this->__returnError("Error occured while connecting to server");
else if ($response->faultCode() != 0)
return $this->__returnError($response->faultString());
else
return $this->__returnSuccess($response->value());
}
function __returnError($err_str){
return array(FALSE, $err_str);
}
function __returnSuccess($value){
return array(TRUE, $value);
}
function getUserInfoByUserID($user_id){
return $this->sendRequest("user.getUserInfo", array("user_id"=>(string)$user_id));
}
function getUserInfoByNormalUserName($normal_username){
return $this->sendRequest("user.getUserInfo", array("normal_username"=>$normal_username));
}
function getBasicUserInfoByNormalUserName($normal_username){### for Zahedan Telecom, ticket 34083
$result = $this->sendRequest("user.getUserInfo", array("normal_username"=>$normal_username));
if(!$result[0]){
return $result;
}
$info = $result[1];
return array(
"user_id" => $info["basic_info"]["user_id"],
"normal_username" => $info["attrs"]["normal_username"],
"remaining_days" => $info["remaining_days"],
"remaining_mega_bytes" => $info["remaining_mega_bytes"],
"credit" => $info["basic_info"]["credit"],
"group_name" => $info["basic_info"]["group_name"]
);
}
function getUserInfoBySerial($serial){
return $this->sendRequest("user.getUserInfo", array("serial"=>$serial));
}
function addNewUser($count, $credit, $isp_name, $group_name, $credit_comment=""){
return $this->sendRequest("user.addNewUsers", array(
"count" => $count,
"credit" => $credit,
"isp_name" => $isp_name,
"group_name" => $group_name,
"credit_comment" => $credit_comment
));
}
function setNormalUserAuth($user_id, $username, $password){
return $this->setUserAttributes($user_id, array(
"normal_user_spec" => array(
"normal_username"=>$username,
"normal_password"=>$password,
)
));
}
}
?>
example code for use function in class but empty array
<?php
require "ibs-jsonrpc-client.php";
$ibs = new IBSjsonrpcClient();
$a = $ibs->getBasicUserInfoByNormalUserName("user1");
print_r($a);
?>