Tiny PHP "standalone” server (or framework) for local debug without Apache/Nginx/Lighttpd/etc

There's manage.py runserver in Django or ruby script/server in Ruby on Rails — those familiar with one of those frameworks should already get the idea what I'm looking for. They run tiny "standalone" web server, which is perfectly enough to debug the application locally, without any need for other software (Apache/Nginx/Lighttpd/etc).