title: Upgrade PHP to 5.4 Symfony errors
body: <p>I've searched and didn't find answer so…</p>
  
  <p>I try to upgrade from PHP 5.3 to PHP 5.4.24. The upgrade itself went well, but now I have problem with my Symfony (ver. 1.3.5-DEV) project. I try to rebuild the project and get errors:
  ob_start(): function '' not found or invalid function name in PHP Warning:  ob_start(): function '' not found or invalid function name in /var/www/html/myproject/lib/vendor/symfony13/config/sfApplicationConfiguration.class.php on line 155</p>
  
  <p>I'be grateful for any advises</p>