Question

How do I redirect all users from *.example.com and example.com to foo.example.com?

My server is using Apache.

Answer 1

Assuming you want to reroute *.example.com/xyx to foo.example.com/xyz you can do this.

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

Though I should note that you might want to consider doing such domain-wide redirection via DNS configuration, if you are pointing them to a site on a different IP address.