I would rather use a set of procedural functions for debugging than a class, instead of making a class where almost all methods are better served static (from my point of view).

All you need is a set of functions thats usable for debugging, and only included when debug mode is triggered (if your system ofcourse have a debugging mode).

Example of functions can be:

• Backtracing in a nice manner thats more detailed that the regular debug_print_backtrace() output
• Functions for catching and displaying exceptions and errors in somewhat unified interface, combining this with the backtrace is a good idea, as it can show if anywhere in the backtrace something occured
• Assertions, http://www.php.net/assert

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