How Can I Dynamically Create Subdomains with PHP and DNS?

Creating Subdomains Dynamically with PHP

To create subdomains such as "http://user.mywebsite.example" for each user using PHP, you can leverage a custom A record in your DNS settings.

DNS Configuration

You need to add a wildcard A record to your DNS zone. This will allow any subdomain of "mywebsite.example" to resolve to a specific IP address. The syntax for the A record would be:

*.mywebsite.example       IN  A       127.0.0.1

Web Server Configuration

Once the DNS record is set up, you need to configure your web server to handle all subdomains. In Nginx, add the following to your server block:

server_name .mywebsite.example

In Apache, add the following to your host file:

ServerAlias *.mywebsite.example

PHP Implementation

Within your PHP code, you can access the subdomain using the HTTP_HOST header, which contains the fully qualified domain name (FQDN) of the request. You can extract the username of the subdomain as follows:

$username = strtok($_SERVER['HTTP_HOST'], ".");

Alternative Approach

If you don't have access to DNS or web server configuration, you can create subdomains using a URL rewrite in .htaccess. However, this approach requires creating a subfolder for each subdomain, which may not be desirable in some scenarios.

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