Is the Plugin architecture the same between 3.x and 4.x?
If I write a plugin for 3.x will it work in 4.x?
[As version 3 has been out for ages (and 4 is on the way) maybe you could change the b2evolution Version drop down on the post submission page - cheers]
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b2evolution CMS Support Forums
From the plugin I wrote, the framework was the same between 3.x and 4.x. The database has a few changes, though.