Removing the index.php file In CodeIgniter

By default, the index.php file will be included in your URLs:

example.com/index.php/news/article/my_article

You can easily remove this file by using a .htaccess file with some simple rules. Here is an example of such a file, using the "negative" method in which everything is redirected except the specified items:

RewriteEngine on
RewriteCond $1 !^(index\.php|images|robots\.txt)
RewriteRule ^(.*)$ /index.php/$1 [L]

In the above example, any HTTP request other than those for index.php, images, and robots.txt is treated as a request for your index.php file.

if the above didn't work

please follows this steps

DirectoryIndex index.php
RewriteEngine on
Rewritecond $1 !^(index\.php|(.*)\.swf|forums|images|css|downloads|jquery|js|robots\.txt|favicon\.ico)
Rewritecond %{REQUEST_FILENAME} !-f
Rewritecond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ ./index.php?$1 [L,QSA]

save as .htaccess file in the ci folder watch the below video tutorial