Removing index.php from the url in codeigniter

Eg:how to remove index.php from the below url ?

http://localhost/hello/index.php/usernamevalidation/validateme

after removing the index.php url will be look like as below

http://localhost/hello/usernamevalidation/validateme

For removing the index.php follow the following steps

open the config.php php in config folder make the changes as below
$config[‘index_page’] = “”;
$config[‘uri_protocol’] = “REQUEST_URI”

and create an .htaccess file and add the below code

RewriteEngine on
RewriteCond $1 !^(index\.php|resources|robots\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L,QSA]