php-xdebug: profile a single cli script without enabling xdebug profiling globally

Create xebug profile only for the current script run and not for everything php-related:

/usr/bin/php -d xdebug.profiler_enable=1 -d xdebug.profiler_output_dir="/path/to/xdebug/output" SomeFancyCliScriptHere.php

We pass two parameters:

• xdebug.profiler_enable=1 enabled/activates the profiler for this php-scripts execution
• xdebug.profiler_output_dir set the directory where the profile will be put in

Using webgring, kgrind, et al we can visualize the resulting profile and can take measures for what particular problem we might encounter.