Login through API

I am trying to find a final way of logging into modx using php to log someone in. I have found this in the forum but it’s not working are there variables that have to be filled in? It would be good to have a final solution.

<?php
$loginContext = isset($_REQUEST[’login_context’]) && !empty($_REQUEST[’login_context’]) ? $_REQUEST[’login_context’] : $modx->context->get(’key’);
$contexts = !empty($scriptProperties[’contexts’]) ? $scriptProperties[’contexts’] : ’’;
$contexts = !empty($_REQUEST[’add_contexts’]) ? $_REQUEST[’add_contexts’] : $contexts;
$authenticated = $modx->user->isAuthenticated($loginContext);

if (!$authenticated) {
// get the username and password in a way that fits your snippet
$_POST[’username’] = $username;
$_POST[’password’] = $password;

if (!isset($_POST[’login_context’])) $_POST[’login_context’] = $loginContext;
$response = $modx->executeProcessor(array(
’action’ => ’login’,
’location’ => ’security’,
’login_context’ => $loginContext,
’add_contexts’ => $contexts,
’rememberme’ => !empty($_REQUEST[’rememberme’]) ? true : false,
));
if (empty($response[’success’]) ) {
// code to handle unhappy user
} else {
// code to handle happy user
}
}