The xdebug extension helps you debugging your script by providing a lot of valuable debug information. the debug information that xdebug can provide includes the following:

* stack traces and function traces in error messages with:
- full parameter display for user defined functions
- function name, file name and line indications
- support for member functions
* memory allocation
* protection for infinite recursions
xdebug also provides:

* profiling information for php scripts
* script execution analysis
* capabilities to debug your scripts interactively with a debug client