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I've searched around a bit but didn't find a guide yet. Something with a checklist would be great.

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Do you mean something like the Adapting a Joomla 1.5 extension to Joomla 2.5 article but for 3.x? – cppl May 6 '14 at 8:52
Yes, I just looked at that article and I would say I'm looking for the equivalent for 2.5 to 3.x. – Nick Weavers May 6 '14 at 14:00
I stumbled up this article which looks helpful… – Nick Weavers May 6 '14 at 14:06
up vote 6 down vote accepted

While not an as extensive guide as Adapting a Joomla 1.5 extension to Joomla 2.5 these two backwards compatibility articles on Joomla Doc's helped us.


Nick also found this non-Joomla Doc's article:

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Thanks @cppl. If others find helpful links they will post here. Google indexes stack exchange pretty well so most people also looking for the answer to my question will find this page. – Nick Weavers May 7 '14 at 18:34

There is a doc page explaining the potential backward compatibility issues between 2.5 and 3.x.

Make sure you don't use any of the deprecated and removed methods found in there and the extension should work in J3.x.

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Ummm the questions about updating an extension, I sort of read that to mean something like the Adapting a Joomla 1.5 extension to Joomla 2.5 article… – cppl May 6 '14 at 8:51
Ah sorry, misread the question then. Changed my answer now. – Bakual May 6 '14 at 8:55

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