horike

Displays Super Global valiables for the current request.Like $_POST, $_GET, and $_COOKIE. Requires the debug bar plugin.

Debug Bar Super Globals

Hasn't received any updates in 8 years and it STILL WORKS!

Still Works (as of WordPress 5.5)

Displays Super Global valiables for the current request.Like $_POST, $_GET, and $_COOKIE. Requires the debug bar plugin.

Paul

Gemini Labs

Black Bar is an unobtrusive Debug Bar for WordPress developers. It collects and displays errors, executed SQL queries, slow actions and hooks, theme templates, global variables, and provides a profiler.
How it helps you with development:
<ul>
<li>Debug your code with the Console</li>
<li>Inspect global variables (COOKIE, GET, POST, SERVER, SESSION, WP_Screen)</li>
<li>Measure performance of your code with the Profiler</li>
<li>View any PHP errors that occur when loading a page in the Console</li>
<li>View executed MySQL queries along with execution time and backtrace</li>
<li>View template files of the active theme in loaded order</li>
<li>View the 50 slowest action and filter hooks along with callbacks ordered by priority</li>
</ul>

Black Bar

Thank you for giving new life to BlackBox Debug Bar!

Not only the usefulness of this plugin, but the beautiful PHP coding leads me to write this review. I have learnt a lot from your code.

Developer must have

Il fait l'affaire haut la main, parfait ;-)
It did the trick, perfect ;-)


Indispensable / Essential

Black Bar is an unobtrusive Debug Bar for WordPress developers that attaches itself to the bottom of the browser window.

Debug Bar Super Globals vs Black Bar