The Xdebug extension helps debugging scripts by providing
debug information such as:

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

Xdebug also provides:

* profiling information for PHP scripts
* code coverage analysis
* capabilities to debug your scripts interactively with a debug client