Elastica with an authenticated search

gistfile1.txt

<?php

set_include_path(get_include_path() . PATH_SEPARATOR . realpath(dirname(__FILE__) . '/Elastica/lib'));

function elasticsearch_autoload($class) {
    $file = str_replace('_', '/', $class) . '.php';
    require_once $file;
}
spl_autoload_register('elasticsearch_autoload');
defined('BASE_PATH') || define('BASE_PATH', realpath(dirname(__FILE__)));

$authHeaderValue = 'Basic '.encodeAuth('YOURUSERNAME', 'YOURPASSWORD').'==';
$authHeader = array('Authorization'=>$authHeaderValue);

$config = array(
    'host' => 'esh01.elasticsearchhq.com',
    'port' => '9200',
    'transport' => 'https',
    'headers' => $authHeader
);


$client = new Elastica_Client($config);
$index = $client->getIndex('YOURINDEXNAME');
$resultSet = $index->search('YOUR QUERY');
echo var_export($resultSet, true);

function encodeAuth($userName, $password){
    $encodedAuth = base64_encode($userName.':'.$password);
    return $encodedAuth;
}
?>

For me it works only without the .'==' in this line:
$authHeaderValue = 'Basic '.encodeAuth('YOURUSERNAME', 'YOURPASSWORD').'==';

Edit
I've just looked it up and PHP adds that equal signs by itself. Doku