mod rewrite - mod_rewrite precedence -

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Assume that I want to support twitter like URL where: twitter.com/username Code> twitter.com/user_name.php?user=username

I have the following 

  revised rule ^ (. *) $ User_name.php? User = $ 1

And it works fine but the problem is that everything including twitter.com/index.php , that means user_name. Php

will be redirected to the exception or predecessor so that the "real file" is not rewritten? I tried to add a clear rule for index.php before and after that, but it does not seem to be effective.

You must add RewriteCond for it 

 < Code> RewriteCond% {REQUEST_URI}! -f [or] RewriteCond% {REQUEST_URI} for # existing files! -d # RewriteRule for existing directory ^ (. *) $ User_name.php? User = $ 1

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