FormIt => using php, how can I detect if the validation has passed ?

Hello,

I have FormIt on the "my profile" page where the user can complete his personal profile (phone, firstname, lastname...)

There also are extended user fields from the ClassExtender add-on (spoken languages, main skills, other skills...)

I have to write some php code in order to save the extended fields once the FormIt validation has passed

Is there variable for this purpose ?

THank you !