I have heard of people using slugs for generating clean urls. I have no idea how it works. Currently i have a codeigniter site which generates url's like this

www.site.com/index.php/blog/view/7

I sülük alanı koruyarak anlamak kimden ne gibi adresler elde etmek mümkündür

www.site.com/index.php/blog/view/once-upon-a-time

Bu nasıl yapılır? Özellikle CodeIgniter'da referans?