Check if xdebug is working

Question

Without installing a texteditor or an IDE, is it possible to test if xdebug is working, i.e. if it can debug php code?

The only part xdebug comes up in phpinfo() is

Answer 1

Just to extend KsaRs answer and provide a possibility to check xdebug from command line:

php -r "echo (extension_loaded('xdebug') ? '' : 'non '), 'exists';"