htaccess | remove .php from url

This .htaccess code below should be able to remove .php from the url, but in altervista it doesn't work. Can't seem to solve the problem. Does anyone have an idea?

Code:

---

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ $1.php [NC,L]

---

This should work:

Code:

---

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ /$1.php [NC,L]

---

If you are on the root directory.

Thank you, the extra / worked!