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Xdebug Update: January 2026
Original Post

In this update I explain what happened with Xdebug development in the last month.

In the last month, I spent only around 9 hours on Xdebug, with 24 hours funded. The rest of the time, I spend on building out Xdebug Cloud version 2.

Xdebug 3.5

Most of this month I spent on a few bug and performance reports from the Xdebug 3.5 release — most notable a performance degradation on Windows due to the new experimental control sockets.

I also spent time on my large better code coverage patch, which still isn't quite as performant as the current feature; although it does give more precise results.

Native Path Mapping

Fabian Potencier, from Symfony fame, has created an exploratory patch for Twig to make use of Xdebug's new Native Path Mapping functionality.

From the initial patch, it became clear that a few things need to be improved on the Xdebug side for this to be a complete feature. For that reason, I have created a few issues to work on:

Invent better way of configuring lots of line-to-line mappings

Create xdebug_add_source_map_directory() function to dynamically add directories where Xdebug will load path mapping files from

Add EOF marker/stanza to native path file mapper

My PhpStorm issue to allow for the setting of breakpoints in template file has now been merged, and is scheduled for 2026.1 EAP 2. At the time of writing this isn't quite out yet, so I will keep you posted.

Xdebug Videos

I have created one new videos in the last month:

Xdebug 3: Interrupting Long Running Scripts with VS Code for Debugging

All Xdebug videos are now available on the phpc.tv PeerTube instance. This will be the primary location for new videos, although I also still post them to my YouTube channel.

If you have any suggestions, feel free to reach out to me on Mastodon or via email.

Xdebug Cloud

I am currently reworking Xdebug Cloud, the Proxy As A Service platform to allow for debugging in complex networking scenarios.

The new version will allow for automatic subscriptions.

Packages will start at £16/month for one-developer companies.

If you want to be kept up to date with Xdebug Cloud, please sign up to the mailing list, which I will use to send out an update not more than once a month.