How to use URL Rewrite on IIS for a single code base for multiple sites in PHP

I have used the Apache Mod Rewrite for PHP but not in IIS.

BACKGROUND:

I have inherited over 400 sites on IIS with PHP all with a copy of the identical code base. The current code base has a unique connection string per client and that is why it was copied over and over again.

Each being a subdomain pointing an individual site in IIS:

• customer1.mysite.com
• customer2.mysite.com

I have used Sessions and PHP to get to a single code base with each site pointing to its own directoy that contains a single PHP file that pulls variables from the database master table and places them into Session strings using a virtual directory for the now single code base.

But now I want to take it a step further. The idea for this came from using Zend bootstrap with Apache.

My next step is to eliminate the indiviual PHP files and use a bootstrap file along with a single code base in a single directory on a single IIS site. www.mysite.com

QUESTION

I want to know if it is possible to do a rewrite rule so that any subdomain on mysite.com goes to mysite.com/bootstrap.php thus customer1.mysite.com goes to www.mysite.com/bootstrap.php and customer2.mysite.com goes to www.mysite.com/bootstrap.php but the subdomain stays in tack - even though it is just one site.

So that a call to: customer1.mysite.com goes to www.mysite.com and the bootstrap can read the subdomain, look up the site parameters, place them in sessions, and then allow acc开发者_JAVA技巧ess to the site.

Or if you know of a better way to accomplish this please let me know but I cannot change the 400 plus subdomains the clients are using to access the product.

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If you are using ISAPI Rewrite (A ModRewrite for IIS), you could have your bootstrap.php look at the "X-Rewrite-URL" HTTP header, which is the original, unmodified, URL, and make a decision on what to show based on that.

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Rewrite would not work because the wildcard is not allowed. So I had to add each subdomain to a single folder. A little more work but it solved the problem.