Xdebug: – It uses the DBGp debugging protocol for debugging.
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.[4]
Xdebug is also available via PECL
