permissions-writer.php

<?php

function generatePayload($username, array $permissions) {

    $xml = [
        '{http://myns.org/}/user' => $username,
        '{http://myns.org/}/permissions' => new Sabre\Xml\Element\Elements($permissions)
    ];

    $service = new Sabre\Xml\Service();
    return $service->write('{http://myns.org/}user', $xml);
    
}