adcfi/server/desconectar.php

<?php
require_once "{$_SERVER['DOCUMENT_ROOT']}/dependencies.php";

use Respect\Validation\Validator as v;

// only requre POST ['action' => 'desconectar' | 'sign-out']
methods(['POST' => v::keySet(
    v::key('action', v::stringType()->notEmpty()->in(['desconectar', 'sign-out']))
)]);

switch ($_POST['action']) {
    case 'desconectar':
        unset($_SESSION['page']);
        unset($_SESSION['moodle_db']);
        break;

    case 'sign-out':
        session_destroy();
        break;
}

header('Location: /');