How Can I Create Dynamic Subdomains Using .htaccess and PHP?

Creating Subdomains on the Fly with .htaccess (PHP)

When creating a system where user accounts have dedicated subdomains on a website, it is often necessary to understand how to dynamically generate these subdomains using the .htaccess file and PHP. Here's a breakdown of the steps involved:

DNS Configuration

1. Create a wildcard entry on your DNS server. This entry should follow the format .website.example. The wildcard () allows the DNS to resolve subdomains such as johndoe.website.example.

Apache Configuration

2. In your Apache vhost container, specify the wildcard subdomain using the ServerAlias directive. This directive should match the wildcard entry you created in the DNS settings. For example:

<VirtualHost *:80>
  ServerName server.example.org
  ServerAlias *.website.example.org
  UseCanonicalName Off
</VirtualHost>

PHP Subdomain Extraction

3. To identify the subdomain that a user is accessing, you can utilize the $_SERVER super global variable in PHP. The following PHP code will extract the subdomain:

preg_match('/([^.]+)\.website\.example\.org/', $_SERVER['SERVER_NAME'], $matches);
if (isset($matches[1])) {
    $subdomain = $matches[1];
}

This regular expression allows for variations such as accessing via johndoe.website.example.org or www.johndoe.website.example.org.

4. Once you have extracted the subdomain, you can display the appropriate data associated with the user account. This process may involve querying a database or accessing other resources based on the subdomain.

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