When user enters url like
http://example.com/app/abcd123/
I want to show hime page from
http://example.com/app/index.php?param=abcd123
Without changing URL in browser.
I put .htaccess file inside app folder with code
RewriteEngine on
RewriteCond %{REQUEST_URI} ^/index.php [NC]
RewriteCond %{QUERY_STRING} ^param=(.*)
RewriteRule (.*) http://example.com/app/%1? [R=301,L]
/app/ a real directory?