PHP Example using NuSOAP with the v4 SOAP API to login and retrieve a session id

result.txt

Array
(
    [id] => 9uukc92a6lb9v620reqv34mmg1
    [module_name] => Users
    [name_value_list] => Array
        (
            [0] => Array
                (
                    [name] => user_id
                    [value] => 1
                )

            [1] => Array
                (
                    [name] => user_name
                    [value] => admin
                )

            [2] => Array
                (
                    [name] => user_language
                    [value] => en_us
                )

            [3] => Array
                (
                    [name] => user_currency_id
                    [value] => -99
                )

            [4] => Array
                (
                    [name] => user_is_admin
                    [value] => 1
                )

            [5] => Array
                (
                    [name] => user_default_team_id
                    [value] => 1
                )

            [6] => Array
                (
                    [name] => user_default_dateformat
                    [value] => m/d/Y
                )

            [7] => Array
                (
                    [name] => user_default_timeformat
                    [value] => h:ia
                )

            [8] => Array
                (
                    [name] => user_number_seperator
                    [value] => ,
                )

            [9] => Array
                (
                    [name] => user_decimal_seperator
                    [value] => .
                )

            [10] => Array
                (
                    [name] => mobile_max_list_entries
                    [value] => 10
                )

            [11] => Array
                (
                    [name] => mobile_max_subpanel_entries
                    [value] => 3
                )

            [12] => Array
                (
                    [name] => user_currency_name
                    [value] => US Dollars
                )

        )

)

SOAP_PHP_login_example.php

<?php

$username = "admin";
$password = "password";
$url = "http://{site_url}/service/v4/soap.php?wsdl";

//require NuSOAP
require_once("./nusoap/lib/nusoap.php");

//retrieve WSDL
$client = new nusoap_client($url, 'wsdl');

//display errors
$err = $client->getError();
if ($err)
{
	echo '<h2>Constructor error</h2><pre>' . $err . '</pre>';
	echo '<h2>Debug</h2><pre>' . htmlspecialchars($client->getDebug(), ENT_QUOTES) . '</pre>';
	exit();
}

//login -------------------------------------------------------

$login_parameters = array(
     'user_auth' => array(
          'user_name' => $username,
          'password' => md5($password),
          'version' => '1'
     ),
     'application_name' => 'SoapTest',
     'name_value_list' => array(
     ),
);

$login_result = $client->call('login', $login_parameters);

echo '<pre>';
print_r($login_result);
echo '</pre>';

//get session id
$session_id =  $login_result['id'];