قفل کردن www در آدرس URL دومین

code :

RewriteEngine on

code :

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

code :

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

code :

RewriteCond %{HTTP_HOST} !^(www|sub1|sub2|sub3)\.example\.com$ [NC]

code :

$req_uri = $_SERVER['REQUEST_URI'];
$req_domain = $_SERVER['HTTP_HOST'];
$sub = substr( $domaine, 0, strpos($domaine,".") );
if ($sub != 'www')
{
   header("Status: 301 Moved Permanently", false, 301);
   header("Location: http://www.example.com/$req_uri");
   exit();
}

code :

RewriteEngine On
RewriteBase /

code :

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

code :

RewriteRule ^$ /index.php [QSA,L,R=301]

code :

RewriteRule ^$ http://forum.example.com/index.php [QSA,L,R=301]