It's actually quite simple, all that you need is an apache based http server, and a text editor (notepad for windows, kate for linux.)
Start up your editor and put these lines in there, don't worry I'll explain later
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RewriteEngine On
RewriteRule ^index(.*).php$ index.php?foo=$1 [L,NC]
Ok to start off,
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RewriteEngine On
This code just tells apache you will be "masking" some filenames.
The next line:
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RewriteRule ^index(.*).php$ index.php?foo=$1 [L,NC]
This tells apache that for every url of your site that has index.php?foo=***; it will be rewritten to index***.php
Save this file as .htaccess. If you are in windows, save it as htaccess.txt then upload it, and use your ftp client's rename function to rename it to .htaccess; or you can saveas .htaccess in notepad/wordpad.
So now whenever you want to pass variable "foo" with value "***" within your page simply link to indexfoo.php.
Other forms can be created, allowing multiple variables such as:
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RewriteRule ^index_(.*)_(.*)_(.*).php$ index.php?foo=$1&foo2=$2&foo3=$3 [L,NC]
That just tells apache that index_bar_bar2_bar3.php really is index.php?foo=bar&foo2=bar2&foo3=bar3.
The reason for all of this is that it is easier for google to index your pages, and MORE pages will get indexed because index.php?foo=bar and index.php?foo2=bar2&foo3=bar3 are similar and don't count as much to your innersite links (correct me if I am wrong). But indexbar.php and index_bar2_bar3.php are two dissimilar links and are treated as thus.
