Can I customize the Magento app/code/core folder without affecting future upgrades?
- by mck89
I found a guide on how to add new attributes to users, it explains that for this operation I must modify some files in the app / code / core / Mage directory (the directory that contains Magento’s modules).
But if i make some changes in that folder will this affect future upgrades?
Will an upgrade will delete my changes?
Should I limit the changes only to my modules to not have problems with updates?