Using PHP namespaces in a Zend Framework (v1) application

Actually there is a simple workaround suggested by Dmitry on the ZF issue tracker:

class Bootstrap extends Zend_Application_Bootstrap_Bootstrap
{
    protected function _initAutoloader()
    {
        $loader = function($className) {
            $className = str_replace('\\', '_', $className);
            Zend_Loader_Autoloader::autoload($className);
        };

        $autoloader = Zend_Loader_Autoloader::getInstance();
        $autoloader->pushAutoloader($loader, 'Application\\');
    }
}

Works like a charm for me!