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The following rule in my .htaccess works just fine for routing calls to index.php:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php [QSA,L]

However, this does not work when running on a temporary URL like http://example.com/~test/.

In such a case, the .htaccess file needs to read:

RewriteEngine On
RewriteBase /~test/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php [QSA,L]

Note the extra RewriteBase.

Question: is it possible to write a rule in .htaccess to "detect" whether to apply that RewriteBase?

The reason is the .htaccess if version controlled, and I'd like for it to work on multiple installations.

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I've spent so long screwing around with this, and have found the same problem. Why the hell cant RewriteBase have the same value as Alias? It's crazy... –  nbolton Jun 8 '12 at 21:02
    
Yes, it seems like a pain that's just "one of those things". –  eoinoc Jun 12 '12 at 22:10

2 Answers 2

up vote 1 down vote accepted

As far as I know, there's no reliable way to detect what the RewriteBase should be. If there were, there would be no need for the kluge that RewriteBase is, as mod_rewrite could just detect the correct base automatically.

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Triying the same and on my search I found that symfony2 frameworks .htaccess file is doing that at least it is stated in the file that it would. I tried to use it in my own setup but didnt work. Maybe that will help you guys somehow.

# Determine the RewriteBase automatically and set it as environment variable.
# If you are using Apache aliases to do mass virtual hosting or installed the
# project in a subdirectory, the base path will be prepended to allow proper
# resolution of the app.php file and to redirect to the correct URI. It will
# work in environments without path prefix as well, providing a safe, one-size
# fits all solution. But as you do not need it in this case, you can comment
# the following 2 lines to eliminate the overhead.
RewriteCond %{REQUEST_URI}::$1 ^(/.+)/(.*)::\2$
RewriteRule ^(.*) - [E=BASE:%1]
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