authn_authoritative: Set to true if LDAP's responses are authoritative (meaning if LDAP fails, do check the any other plugins or the internal password database).
autoregistration: Set to true if users should be automatically created when they attempt to login.
host*: LDAP server name to connect to. You can provide several hosts in an array in which case the hosts are tried from left to right.. See http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php
port: Port on the server. See http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php
version: LDAP version. See http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php
starttls: TLS is started after connecting. See http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php
binddn: The distinguished name to bind as (username). See http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php
bindpw: Password for the binddn. See http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php
basedn*: LDAP base name (root directory). See http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php
options: See http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php
filter: Default search filter. See http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php
scope: Default search scope. See http://pear.php.net/manual/en/package.networking.net-ldap2.connecting.php