Force redirect to www using .htaccess

Edit your .htaccess file and add the following:

# Redirect to wwww
RewriteEngine On
RewriteCond %{HTTP_HOST} ^[0-9a-zA-Z-]+\.[a-zA-Z]{2,}$
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

# Redirect to wwww

RewriteEngine On

RewriteCond %{HTTP_HOST} ^[0-9a-zA-Z-]+\.[a-zA-Z]{2,}$

RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]