PHP检查对IP地址敏感的子域

Question

I'm having some issue with something that seemed simple to me at first, but is now proving very difficult. Maybe I'm over thinking it - would love your help.

Overview: I have a web application with two interfaces (1 for clients and 1 for customers ). All customers get routed one way and all clients get routed another. I determine which login screen to show based on their subdomain. customers get the base domain (+www) and clients go to [ clientName ].example.com

Problem: I was determining this before by doing string manipulations on env("HTTP_HOST") -- see code below. However, this now poses an issue when using local IPs (for testing with other devices/ people). My code, which looks for '.' in the host environment fails because IPs have 3 dots and ' localhost ' has 0

These are the different naming parameters I've established and how I'd like the route...

CUSTOMER ----------------------------- CLIENT
                xyz.example.com ------>
        <------ www.example.com
        <------ example.com

                xyz.localhost   ------>
        <------ www.localhost
        <------ localhost

                xyz.192.168.X.X ------>
        <------ www.192.168.X.X
        <------ 192.168.X.X

I could be really over thinking this and am hoping there's some simple Php function like "get_subdomain()" that will do this for me. But I'm not seeing it and would really love some help.

Thanks!

Current Code:

$host = env("HTTP_HOST");
$group = null;

// if there is exactly one dot IE example[dot]com then there is no subdomain
if(substr_count($host,'.')==1){
    $group = 'customer'
}else{ // there is a subdomain
    $subdomain = substr($host, 0, strpos($host, "."));
    if($subdomain=='www'){
        $group = 'customer'
    }else{
        $group = 'client'
    }
}

CakePhp if that helps?

Answer 1

I hope this answer does not seem to avoid your specific question, but it seems to me that you are inviting alternatives in your question. I do think you are over-thinking the solution, especially since it is primarily to assist you in your test environment.

What I suggest is that you define your own local domains for testing instead of using IP Addresses. So for example you could (in your hosts file or equivalent) define:

xyzclient.mylocaldomain  192.168.1.1 [or whatever your local ip is]
www.mylocaldomain        192.168.1.1 
xyz.localhost            192.168.1.1
www.localhost            192.168.1.1

Then you don't need to code any differently for local or live environments. Just in case: this guide to setting up and configuring local domains may be useful.