Xdebug is a PHP extension which provides debugging and profiling capabilities. It uses the DBGp debugging protocol. The debug information that Xdebug can provide includes the following: * stack 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 * code coverage analysis * capabilities to debug your scripts interactively with a debugger front-end.