How to let PHP to create subdomain automatically f

问题:

How do I create subdomain like http://user.mywebsite.com ? Do i have to access htaccess somehow? Is it actually simply possible to create it via pure php code or I need to use some external script-server side language?

To those who answered: Well, then, should i ask my hosting if they provide some sort of DNS access??

回答1:

You\'re looking to create a custom A record.

I\'m pretty sure that you can use wildcards when specifying A records which would let you do something like this:

*.mywebsite.com       IN  A       127.0.0.1

127.0.0.1 would be the IP address of your webserver. The method of actually adding the record will depend on your host.

---

Doing it like http://mywebsite.com/user would be a lot easier to set up if it\'s an option.

Then you could just add a .htaccess file that looks like this:

Options +FollowSymLinks

RewriteEngine On
RewriteRule ^([aA-zZ])$  dostuff.php?username=$1

In the above, usernames are limited to the characters a-z

---

The rewrite rule for grabbing the subdomain would look like this:

RewriteCond %{HTTP_HOST} ^(^.*)\\.mywebsite.com
RewriteRule (.*)  dostuff.php?username=%1

回答2:

The feature you are after is called Wildcard Subdomains. It allows you not have to setup DNS for each subdomain, and instead use apache rewrites for the redirection. You can find a nice tutorial here, but there are thousands of tutorials out there. Here is the necessary code from that tutorial:

<VirtualHost 111.22.33.55>
    DocumentRoot /www/subdomain
    ServerName www.domain.tld
    ServerAlias *.domain.tld
</VirtualHost>

However as it required the use of VirtualHosts it must be set in the server\'s httpd.conf file, instead of a local .htaccess.

回答3:

I do it a little different from Mark. I pass the entire domain and grab the subdomain in php.

RewriteCond {REQUEST_URI} !\\.(png|gif|jpg)$
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ /index.php?uri=$1&hostName=%{HTTP_HOST}

This ignores images and maps everything else to my index.php file. So if I go to

http://fred.mywebsite.com/album/Dance/now

I get back

http://fred.mywebsite.com/index.php?uri=album/Dance/now&hostName=fred.mywebsite.com

Then in my index.php code i just explode my username off of the hostName. This gives me nice pretty SEO URLs.

回答4:

We setup wildcard DNS like they explained above. So the a record is *.yourname.com

Then all of the subdomains are actually going to the same place, but PHP treats each subdomain as a different account.

We use the following code:

$url=$_SERVER[\"REQUEST_URI\"];
$account=str_replace(\".yourdomain.com\",\"\",$url);

This code just sets the $account variable the same as the subdomain. You could then retrieve their files and other information based on their account.

This probably isn\'t as efficient as the ways they list above, but if you don\'t have access to BIND and/or limited .htaccess this method should work (as long as your host will setup the wildcard for you).

We actually use this method to connect to the customers database for a multi-company e-commerce application, but it may work for you as well.

回答5:

Don\'t fuss around with .htaccess files when you can use Apache mass virtual hosting.

From the documentation:

#include part of the server name in the filenames VirtualDocumentRoot /www/hosts/%2/docs

In a way it\'s the reverse of your question: every \'subdomain\' is a user. If the user does not exist, you get an 404.

The only drawback is that the environment variable DOCUMENT_ROOT is not correctly set to the used subdirectory, but the default document_root in de htconfig.

回答6:

Simple PHP solution for subdomains and multi-domain web apps

Step 1. Provide DNS A record as \"*\" for domains (or domain) you gonna serve \"example.org\"

A record => *.example.org
A record => *.example.net

Step 2. Check uniquity of logins when user registering or changing login. Also, avoid dots in those logins.

Step 3. Then check the query

        // Request was http://qwerty.example.org
        $q = explode(\'.\', $_SERVER[\'HTTP_HOST\']);
        /*
            We get following array
            Array
            (
                [0] => qwerty
                [1] => example
                [2] => org
            )
        */

        // Step 4.
        // If second piece of array exists, request was for 
        // SUBDOMAIN which is stored in zero-piece $q[0]
        // otherwise it was for DOMAIN

        if(isset($q[2])) {
            // Find stuff in database for login $q[0] or here it is \"qwerty\"
            // Use $q[1] to check which domain is asked if u serve multiple domains
        }

?>

This solution may serve different domains

qwerty.example.org
qwerty.example.net 

johnsmith.somecompany.com
paulsmith.somecompany.com

If you need same nicks on different domains served differently, you may need to store user choise for domain when registering login.

smith.example.org // Show info about John Smith
smith.example.net // Show info about Paul Smith 

回答7:

You could [potentially] do a rewrite of the URL, but yes: you have to have control of your DNS settings so that when a user is added it gets its own subdomain.

回答8:

In addition to configuration changes on your WWW server to handle the new subdomain, your code would need to be making changes to your DNS records. So, unless you\'re running your own BIND (or similar), you\'ll need to figure out how to access your name server provider\'s configuration. If they don\'t offer some sort of API, this might get tricky.

Update: yes, I would check with your registrar if they\'re also providing the name server service (as is often the case). I\'ve never explored this option before but I suspect most of the consumer registrars do not. I Googled for GoDaddy APIs and GoDaddy DNS APIs but wasn\'t able to turn anything up, so I guess the best option would be to check out the online help with your provider, and if that doesn\'t answer the question, get a hold of their support staff.

回答9:

First, you need to make sure your server is configured to allow wildcard subdomains. I achieved that in JustHost by creating a subomain manually named *. I also specified a folder called subdomains as the document root for wildcard subdomains. Add this to a .htaccess file in your subdomains folder:

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\\.website\\.com$
RewriteCond %{HTTP_HOST} ^(\\w+)\\.website\\.com$
RewriteCond %{REQUEST_URI}:%1 !^/([^/]+)/([^:]*):\\1
RewriteRule ^(.*)$ /%1/$1 [QSA]

Finally, all you need to do is create a folder in your subdomains folder, then place the subdomain\'s files in that directory.

回答10:

This can be achieved in .htaccess provided your server is configured to allow wildcard subdomains. I achieved that in JustHost by creating a subomain manually named * and specifying a folder called subdomains as the document root for wildcard subdomains. Add this to your .htaccess file:

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\\.website\\.com$
RewriteCond %{HTTP_HOST} ^(\\w+)\\.website\\.com$
RewriteCond %{REQUEST_URI}:%1 !^/([^/]+)/([^:]*):\\1
RewriteRule ^(.*)$ /%1/$1 [QSA]

Finally, create a folder for your subdomain and place the subdomains files.

回答11:

I just wanted to add, that if you use CloudFlare (free), you can use their API to manage your dns with ease.