.htaccess rewrite

I am using an .htaccess file that is working correctly, but I need to add another request. In my current .htaccess I pointing all pages to a pages.php...Sometimes I need to point to a different page and it is showing the .php extension. How can I add to my current .htaccess file to remove the .php from any file name that is showing the .php in the url..

Thanks

RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.xxxxxx.com/$1 [R,L]
RewriteRule ^([a-zA-Z0-9-z\-]+)$ page.php?id=$1
RewriteRule ^([a-zA-Z0-9-z\-]+)/$ page.php?id=$1

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