Detect if www subdomain is present

Question

I want to detect if users who enter my site have entered the www subdomain, which most wont, and in such case redirect them to www. Basically if a user enters mysite.com I need to redirect them to www.mysite.com but I don't see how this can be detected with PHP only? My $_SERVER array doesn't contain such information. Is this possible at all?

You can do it by your web-server (like apache's htaccess or ngnix — undone, Sep 24 '13 at 21:21
@JohnConde but this is the opposite of what I'm trying to do :/ — php_nub_qq, Sep 24 '13 at 21:23
@SheikhHeera yes, I can use .htaccess but not really good at it — php_nub_qq, Sep 24 '13 at 21:24
@php_nub_qq You can't use that as a guide to do what you want? It definitely tells you how to do it. — John Conde, Sep 24 '13 at 21:24

score 2 · Answer 1 · answered Sep 24 '13 at 21:22

2

You may try this using Apache mod rewrite (put it in .htaccess file)

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

answered Sep 24 '13 at 21:22

The Alpha

143,660
29
287
307

Please forgive me for I am going to accept Sanja's answer but I believe he will enjoy 15 rep more than you will at this point. – php_nub_qq Sep 24 '13 at 21:29
1

@php_nub_qq, if it makes you happy, I don't mind at all :-) – The Alpha Sep 24 '13 at 21:32

score 1 · Accepted Answer · answered Sep 24 '13 at 21:26

Worse solution is to do it with PHP:

if (substr($_SERVER['SERVER_NAME'], 0, 4) !== 'www.') {
  header('Location: http://www.' . $_SERVER['SERVER_NAME']);
  exit();
}

Better from performance point of view solution with .htaccess:

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

Detect if www subdomain is present

2 Answers2