Redirect non www to www with htaccess

If your website is having canonical issue then you need to fix this issue on priority. Canonical issue is when website showing the same data with www or non-www. Kindly follow the below redirection code.

Redirecting non-www to www with .htaccess

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

Redirecting www to non-www

RewriteEngine On
RewriteCond %{HTTP_HOST} !^my-domain\.com$ [NC]

RewriteRule ^(.*)$ http://my-domain.com/$1 [R=301,L]