RewriteEngine On

# Assuming you’re running at domain root. Change to working directory if needed.
RewriteBase /

# www check
# If you’re running in a subdirectory, then you’ll need to add that in
# to the redirected url (http://www.mydomain.com/subdirectory/$1

RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*)$ http://www.mydomain.com/$1 [R=301,L]

#
# Trailing slash check

# Don’t fix direct file links
RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)$ $1/ [L,R=301]

# Finally, forward everything to your front-controller (index.php)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php [QSA,L]

/*** Removing www from Urls ***/
RewriteEngine On
RewriteCond %{HTTP_HOST} ^www.example.com$ [NC]
RewriteRule ^(.*)$ http://example.com/$1 [R=301,L]

/*** Adding www into Urls ***/
RewriteEngine on
RewriteCond %{HTTP_HOST} ^example.com$
RewriteRule (.*) http://www.example.com$1 [R=301]

/*** Remove Index.php From the Url ***/

Options +FollowSymLinks
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L,QSA]