how to rewrite URL From like About_us to about-us this is like - SEO Friendly URLs in Codeigniter

For rewrite URL From like About_us to about-us this is like - SEO Friendly URLs

Step:1:-  Go in your codeigniter project =>   project folder/application/config/routes.php
Step:2:-  $route['translate_uri_dashes'] = False;

so write TRUE in place of False in routes.php here $route['translate_uri_dashes'] = False;

and now refresh your project:

example:- projectname/about_us into projectname/about-us