symfony - Do something when one special field changes (doctrine) -

I use symfony2 with the principle that I want to make some changes when there is a change in the particular characteristics of an entity; In fact, I want to save the changes of my qualities and I have a situation of change. For example, I can say that when a field does something related to the name of the changed field. For example, if email changes, then add some line to another unit.

Thank you. hachangfield . , getNewValue . You can read more here: