php - Fatal error: Class 'Zend_Locale' not found -

i'm developing web app zend framework 2.

i want achieve urls current locale automatically built-in, i.e. /locale/controller/action/etc. wrote this:

<?php  $locale = new zend_locale();  ?>  <ul class="nav">     <li>         <a href="/<?php echo $locale->getlanguage(); ?>/devices">devices</a>         <ul>             <li>                 <a href="/devices/add"><img src="img/navbar/add.png" alt="+"> add</a>             </li>         </ul>     </li>     <li>         <a href="/<?php echo $locale->getlanguage(); ?>/favorites">favorites</a>         <ul>             <li>                 <a href="/favorites/add"><img src="img/navbar/add.png" alt="+"> add</a>             </li>         </ul>     </li> </ul> 

and put in navbar.phtml file include in way

include("navbar.phtml"); 

in application/view/layout/layout.phtml.

but, this

fatal error: class 'zend_locale' not found in blabla\module\application\view\layout\navbar.phtml on line 3 

what's wrong? forget "use"? sorry i'm newbie in php.

installation of php intl extension must.