FirePHP: Now debugging for Ajax & PHP application more simple

FirePHP - Firebug Extension for AJAX Development
FirePHP – Firebug Extension for AJAX Development

Simple to integrate and easy to use for debug PHP and Ajax application. FirePHP enables you to log to your Firebug Console using a simple PHP method call.

Firebug Extension for AJAX Development. All data is sent via response headers and will not interfere with the content on your page.

FirePHP is ideally suited for AJAX development where clean JSON and XML responses are required.

FirePHP source and documentation:

FirePHP