[ASK] How to change capitalize to lowercase and replace spacing with underscores

[eluser]senz[/eluser]
[quote author="Derek Allard" date="1277215336"]Sharpe has a good solution, but you might also want to look at url_title(), which is my preferred approach.

http://ellislab.com/codeigniter/user-gui...elper.html[/quote]

I just read the URL Helper as you recomended and finally i can solved my problem after read the url_title() at URL Helper Guide.
Thanks Derek