http://www.tiobe.com/index.php/content/paperinfo/tpci/index.... i would mostly agree with this chart. ruby is on the roll, but i do not think it will catch up with php any time soon. php has many great frameworks like:

http://kohanaframework.org/

http://www.yiiframework.com/

http://symfony-reloaded.org/

http://fatfree.sourceforge.net/

and language is evolving in decent steps, has A LOT components, extensions, libraries. its easy to find solutions for your problems in search engines, or community. i like ruby too, but sorry, i will be going probably for python/golang/(maybe even java) soon (i dont like front end stuff). ruby is just too young to become something more serious in web development, and other languages are catching good ideas from ruby fast... you should define your goals more precisely and choose where you will go next