<?php

Am_Di::getInstance()->hook->add(Am_Event::GENERATE_LOGIN, function (Am_Event $e) {
    $user = $e->getUser();
    if ($_ = preg_replace('/[^0-9a-zA-Z]/', '', "{$user->name_f}{$user->name_l}")) {
        $i = 1;
        $l = $_;
        while (!$e->getDi()->userTable->checkUniqLogin($l)) {
            $l = $_ . $i++;
        }
        $e->setReturn(array($l));
    }
});