http://blog.jeremybarthe.com/post/1465024153/configurations-javascript-dynamiques-en-symfony

gistfile1.php

var globalConfigs = {
  env                     : '<?php echo sfConfig::get('sf_environment') ?>',
  userCulture             : '<?php echo $sf_user->getCulture() ?>',
  urls: {
    ajaxAutocomplete      : '<?php echo url_for('@homepage') ?>',
    ajaxModalBox          : '<?php echo url_for('@homepage') ?>'
  },
  i18n: {
    example               : "<?php echo esc_specialchars(__('example')) ?>",
    exampleModalboxTitle  : "<?php echo esc_specialchars(__('example_modalbox_title')) ?>"
  }
};