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copied!<p>Subdomains are easy. In hosting environements, in most cases, apache is configured to catch all subdomain calls below the main domain. You just need to have a wildcard DNS defined, so *.example-app.com are pointed to IP of your server. Then your website should catch all calls to those subdomain names.</p> <p>Other domains are hard. They need to be configured as virtual hosts in Apache - see <a href="http://httpd.apache.org/docs/1.3/vhosts/name-based.html" rel="noreferrer">http://httpd.apache.org/docs/1.3/vhosts/name-based.html</a> - that means it will be difficult to automate that, especially in hosting environement - unless your host gives you some API to do just that (easy and more feasible scenario would be to have a distinctive IP assigned to your website, then you can catch all with your Apache - it's probably possible to configure using your hosting control panel or works out of the box - and then just point DNS servers to your IP). </p> <p>Then, after you have configured your Apache to point all necessary calls to your website, you can differnetiate application partitions per subdomain in this way:</p> <ul> <li>get the host header from HTTP request</li> <li>have a database table containing all subdomain names you're serving</li> <li>make a lookup to that database table to determine instance, or user, id and use it later for filtering data / or selecting a database, if you'll go with a "database per application instance" schema.</li> </ul> <p>Good luck :)</p>

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