Hi Guys, posting this after a long period as was little busy ;-). Anyways lets get into the subject.
Whenever OSX 10.x version installed, by default PHP / Ruby will also be installed. This is good but sometimes we don't want the particular version installed so to remove this we need to do the following steps.
sudo mv /System/Library/Frameworks/Ruby.framework/Versions/1.8 /System/Library/Frameworks/Ruby.framework/Versions/1.8.dead
sudo mv /usr/bin/ruby /usr/bin/old_ruby
sudo mv /usr/bin/gem /usr/bin/old_gem
sudo mv /usr/bin/php /usr/bin/old_php