Redirecting to a single domain

If your website is running under several domain names, it is recommended to choose one main domain and make the redirection from other domains to the selected one. Place this part of the code at the beginning of your PHP script.

<?php
$redirect  = 'platon.sk';
$http_host = @$_SERVER['HTTP_HOST'];
$req_uri   = @$_SERVER['REQUEST_URI'];
if (strlen($http_host) > 0
    && strcasecmp($http_host, $redirect))
{
    header('Location: http://$redirect$req_uri');
    exit;
}
?>

The main advantages of this solution are mostly within the area of Search Engine Optimization (SEO):

• the same content is placed on a single website (domain), what most browsers really like;
• Google PageRank value is not divided between several pages, but rather "summarized" together for the one main page;
• as a result of these steps, indexation of your website should improve as well as its ranking in search engines.

Solution using the .htaccess

You can solve this problem using the .htaccess file as well.

Redirect from www to non-www:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^ %{REQUEST_SCHEME}://%1%{REQUEST_URI} [R=301,L]
</IfModule>
					

Redirect from non-www to www:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^ %{REQUEST_SCHEME}://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
</IfModule>