You're visiting the archived website and documentation of Xdebug 2, which is no longer supported. This website is temporarily available and will be discontinued on Dec 31st, 2021.
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Xdebug 2.2.3 is out!

This is a bug-fix release for the 2.2 series. The main feature is support for PHP 5.5 but it also addresses a few minor other issues.

The full change log can be found on the updates page and the source code and Windows binaries can be found on the downloads page.