.htaccess - Rewrite rule to hide dir name from URL

.htaccess - Rewrite rule to hide dir name from URL

I just want to hide the dir name from URL.
From: example.com/dirname/somepage To: example.com/somepage
That code doesnt work for me, i have probably made some mistakes
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule / /dir/$1 [L]
I have already this in .htaccess (to hide php extension)
RewriteEngine On
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteCond %{REQUEST_URI} !/$
RewriteRule (.*) $1\.php [L]