I'm preparing my installation of 1.8 to upgrade to the latest. Over the past year I've had a few different developers assist me and even though I ask them not to modify core code, some do anyway.

I've done a search for any files modified past the installation date and have come across a few that need to be preserved.


If file /code/core/Mage/CatalogSearch/Block/Result.php has been modified, my understanding is that to protect this from the upgrade I need to move it /code/local/Mage/CatalogSearch/Block/Result.php ?

Is moving modified core code to the /app/code/local the correct way to protect modified files from upgrades?

  • I think rewriting it is better, what is mean by clarification? Commented Aug 16, 2014 at 10:50

1 Answer 1


Yes, magento will take the class from the local folder. But it could lead to a wrong magento behavior, because the new version may assume the class has a new methods. And the old version does not have them.

I recommend you run diff command to see the changes an move them into a separate extension class, that extends the core one. This allows to use new features an do not lost the modifications.

  • Thanks for the quick answer, forgot to mention in my question: The same goes for /app/locale any files modified go into the active theme so /app/design/frontend/default/ACTIVE_THEME/local correct?
    – SR_Magento
    Commented Aug 16, 2014 at 11:07
  • For the templates just copy them to the active theme. There is no "local" folder for .phtml files, but for small changes there is local.xml layout.
    – Amasty
    Commented Aug 16, 2014 at 11:26

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