WordPress version compatibility

bbPress buzzes best when run on the newest available version of WordPress – we optimize for the latest and greatest. For this reason, the bbPress team strongly recommends that all WordPress installations be kept up to date. However, we strive to maintain support for a number of legacy WordPress versions – generally, four or five major versions.

Near the beginning of each development cycle, we reassess bbPress’ minimum required WP version. Our rough guidelines are as follows:

• If a WordPress version became obsolete over a year ago, it’s a candidate for removal. See https://wordpress.org/news/category/releases/ for a list of WP release dates.
• If a WordPress version’s use slips below 5% of all WP installations, it’s a strong candidate for removal. See https://wordpress.org/about/stats/ for information about WordPress version usage.

What do we mean when we say that bbPress “supports” a given version of WordPress? Roughly:

• bbPress should run error-free (ie, without fatal errors or PHP notices) on the WP version.
• If a new version of bbPress includes a feature that requires a very recent version of WordPress, the feature should be gracefully disabled on earlier WP versions.
• The WP version will be included in our automated testing builds.

By extension: When we “drop support” for a version of WordPress, it means we stop including it in our builds, stop answering support questions related to that specific WP version, and stop putting function_exists() checks (and the like) targeting that version when building new bbPress features. Dropping support does not mean that we will actively try to break older versions of WP 🙂