RubyRails for PHP programmers starting points

If you have php code that needs to be converted to ruby/rails there are a few starting points
hyperpolyglot should be your homepage:
http://hyperpolyglot.org/scripting

On the ruby site there is a nice intro on Similarities and Differences.

From Rails for Php Programmers i used this pdf PHP to Rails Reference (extract)
on the translating php cookies and session (params for post/get ...)

Also the PHP to Ruby reference is very good
https://github.com/maintainable/php-ruby-reference

Ps: main site http://railsforphp.com/ seems to be down at the moment but i guess you can fork and build the reference yourself