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Hi good morning, I have the following query:

In a module I scheduled something with pure PHP, that is, without creating any module, only modify one that already had and have the following dilemma.

What I have programmed in PHP, Magento be updated if it is lost ?.

That is, I have Magento 2.0 and the shopping cart've programmed using PHP to display a checkbox, however, if for example come out and be updated Magento 2.1, this change I made was lost ?, or would remain? ?.

I need your help, thanks.