Apache giving pages as downloads rather than displaying them

I just installed MediaWiki on a website and I am having some problems.

Whenever I go to "www.something.com/wikidir" the server gives me the PHP index file as an unnamed download instead of displaying it.

However, if I go to "www.something.com/wikidir/index.php" everything works as expected.

I'm not familiar with Apache and was wondering if someone could tell me how to fix this or point me in the right direction?

I'm using a LAMP开发者_如何学运维 stack and Mediawiki 1.7.1 (old I know).

In my .htacces file I have:

AddType application/x-httpd-php5 .php

Sounds like Apache (or PHP?) is serving the page as an application/octet-stream. You can check this by looking at the response headers on the non-index.php page. Firefox can do this using the Web Developer Toolbar > Information > View Response Headers. Look for "Content-Type"

Or, Does the non-index.php link work in IE? Does it go straight to download in Firefox (or another browser)? If the answer is yes, that's the problem.

How to fix it is more complex because there could be a bunch of different things that are causing this. My guess is that's it's an Apache config issue.

Edit Check your .htaccess file. Make sure it's readable by Apache. I bet that's the issue.