regarding this tutorial:
http://www.symfony-project.org/more-with-symfony/1_4/en/06-Advanced-Forms
How to delete an uploaded image?
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Look at the block of PHP code just before the subheading Form Events. There
you'll find that they set the with_delete option to false – set this to true
and add the filename_delete validator with an sfValidatorPass class (you can
look that up here: