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I did some modifications and added some extra functions in the file

/components/MY_COMPONENT/helper/MYFILE.php

What should I do to not lose these modifications in a future component update?

  • You mentioned "template" in your question title...was this a mistake? If you don't want to lose the changes you make, you'll have to create a plugin to extend the helper.php from the component – Lodder Mar 21 '16 at 15:10
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If the Helper Class is loaded in a dynamic way, checking if it's already loaded, YES. You can override it.

Not with a HTML overrides, but with a System Plugin. You can create a System plugin, loading same Helper Class before the original one.

Please, check this related question: How to override core classes?

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