gistfile1.php

<?php

$user = function($name) {
    $me = array(
        'name' => NULL,
        'init' => function($name) use(&$me) {
            $me['name'] = $name;
            return $me;
        },
        'whoami' => function() use(&$me) {
            return $me['name'];
        }
    );
    return $me['init']($name);
};

$foo = $user('bar');
$name = $foo['whoami']();
var_dump($name);