RewriteEngine on

# serve / from /site
RewriteCond %{REQUEST_URI} !^/site
RewriteRule ^(.*)$ /site/$1 [L]

# remove .php extension
#RewriteCond %{THE_REQUEST} ^GET\ (.*)\.php\ HTTP
#RewriteRule (.*)\.php$ $1 [R=301]  ---- broken, adds full path.

# remove index
#RewriteRule (.*)/index$ $1/ [R=301]

# remove slash if not directory ---- broken, adds full path.
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} /$
RewriteRule (.*)/$ $1 [R=301]

# add .php to access file, but don't redirect
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteCond %{REQUEST_URI} !/$
RewriteRule (.*) $1\.php [L]