So you want to have
/article/how_permalink_works/ instead of index.p
how_permalink_works, however keeping that you in your php you will have in $_GET['
'] the string "
how_permalink_works". Well this is how you do it:
Put in your .htaccess:
RewriteEngine on RewriteRule article/([0-9_a-zA-Z\-]+)/$ index.php?article=$1
Some more info on .htaccess: http://www.htaccess-guide.com/
Some more info on permalinks and other url stuff: http://net.tutsplus.com/tutorials/other/using-htaccess-files-for-pretty-urls/