php-xdebug 2.4.0~rc4-1ubuntu1 (amd64 binary) in ubuntu xenial

 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