Is there any simple/comfortable/fast way of switching between default php interpreter and hhvm?
Having project in PHP 5.2, I'd like to work on it on hhvm locally and switch to php before commiting to see if everything works as expected.
If you are running your php code using nginx+fpm (or apache+fpm) as FastCGI, HHVM comes as drop in replacement of fpm as it has fastCGI support. You can start with the migration and post the issues at official page of hhvm. (https://github.com/facebook/hhvm/issues)