<?php
error_reporting(1);
ini_set('display_errors', 1);
$api_url_v1 = "http://star.dev/api/soap/?wsdl=1";

$username = 'test';
$password = 'test123';

$cli = new SoapClient($api_url_v1);

//retreive session id from login
$session_id = $cli->login($username, $password);

//call customer.list method
$result = $cli->call($session_id, 'customer.list', array(array()));
var_dump($result);