Question

I’ve been trying to wrap my head around this concept and how to route it correct but i just have a hard time doing that.

I’m accepting all domains and subdomains to my app but here’s the issue:

Example:

john.myapp.com/foo

it should route to the foo function in the user controller instead of calling a controller called foo.

So:

john.myapp.com/foo -> myapp.com/user/foo
john.myapp.com/foo/bar -> myapp.com/user/foo/bar
someotherdomain.com/foo/bar -> myapp.com/user/foo/bar
myapp.com/foo -> the controller: foo

But this routing should only apply to subdomains and other domains, not myapp.com

Answer 1

Codeigniter doesn’t support routing involving domains as part of it’s default functionality.

If you visited www.example.com/controller/method the router interprets only the /controller/method part and ignores anything before.

This means to achieve what you’re trying you need to route the subdomains to the application using .htaccess.

RewriteCond %{HTTP_HOST} ^((?!www\.)(?!myapp\.com)[^\.]+)\.
RewriteRule ^(.*)$ /index.php?/user/%1/$1 [L] 

This would send all requests like

subdomain.example.com/controller/method go to example.com/index.php/user/controller/method

This will allow you route depending on the subdomain using the standard routing functionality.