Slug function

slug.php

function create_slug($string){
   $string = preg_replace( '/[«»""!?,.!@£$%^&*{};:()]+/', '', $string );
   $string = strtolower($string);
   $slug=preg_replace('/[^A-Za-z0-9-]+/', '-', $string);
   return $slug;
}