<?php
/* php5, php7
function __autoload($class_name) {
    include $class_name . '.php' ;
}
 */

function my_autoloader($class) {
    include  $class . '.php';
}

spl_autoload_register('my_autoloader');

/* Or, using an anonymous function
spl_autoload_register(function ($class) {
    include  $class . '.php';
});
*/

$user = new User();
$user->setSession() ;

$obj = new Server();
$obj->prn_cookie();
$obj->prn_session();

?>