Check for `PHP_AUTH_USER` as well (#1039)
Check for `PHP_AUTH_USER` as well (#1039)

* Check for `PHP_AUTH_USER` as well

Mention in comments that NGINX (or other web servers configured properly)
can be supported by this authentication backend as well.
fruux/sabre-dav,staabm/sabre-dav,PVince81/sabre-dav,staabm/sabre-dav,fruux/sabre-dav,fruux/sabre-dav,PVince81/sabre-dav,PVince81/sabre-dav,staabm/sabre-dav