PHP Web Console: Execute PHP commands on a console Web page

This class can Execute PHP commands on a console web page inspired by the Chromium JavaScript console.

It can execute given PHP code and other console commands and stores HTML to display the results on session variables.

The class can output the responses of the requested console commands as response to AJAX requests that update the current page with the commands output for the users to see on the web page.

The other console commands that it supports are log to display an arbitrary message, alert to display a message in an alert dialog on the browser, backtrace to show the function call backtrace.