bcons - PHP debug helper

This extension adds a panel to the DevTools that displays PHP data. It allows you to perform debugging tasks, such as logging messages or the values of variables at set points in your code, displaying errors and warnings, and tracking session, cookies, and payload data. You can also view the messages using any web browser through the 'Console' section of the bcons.dev site; this allows you to repurpose old tablets. It's free for 1 user / project, so you can try it indefinitely.