symfony dynamic fixtures

http://www.symfony-project.org/jobeet/1_2/Propel/en/06#chapter_06_dynamic_fixtures

Example:

UllTimePeriod:
  # dynamically add a period for the current month 
  current_period:
    Translation:
      en:
        name:                   <?php echo strftime('%B %Y') . "\n" ?>
      de:
        name:                   <?php echo strftime('%B %Y') . "\n" ?>
    from_date:                  <?php echo "'" . date('Y-m' . '-01') . "'\n" ?>
    to_date:                    <?php echo "'" . date('Y-m-t') . "'\n" ?>
    namespace:                  test