# Getting information from the LDAP server

## RootDSE

See the following documents for more information on the attributes contained
within the RootDSE for a given LDAP server.

- [OpenLDAP](http://www.zytrax.com/books/ldap/ch3/#operational)
- [Microsoft ActiveDirectory](http://msdn.microsoft.com/en-us/library/ms684291(VS.85).aspx)
- [Novell eDirectory](http://www.novell.com/documentation/edir88/edir88/index.html?page=/documentation/edir88/edir88/data/ah59jqq.html)

### Getting hands on the RootDSE

```php
use Laminas\Ldap\Ldap;

$options = [/* ... */];
$ldap = new Ldap($options);
$rootdse = $ldap->getRootDse();
$serverType = $rootdse->getServerType();
```

## Schema Browsing

### Getting hands on the server schema

```php
use Laminas\Ldap\Ldap;

$options = [/* ... */];
$ldap = new Ldap($options);
$schema = $ldap->getSchema();
$classes = $schema->getObjectClasses();
```

#### OpenLDAP

- TODO

#### ActiveDirectory

Due to restrictions on Microsoft ActiveDirectory servers regarding the number of
entries returned by generic search routines and due to the structure of the
ActiveDirectory schema repository, schema browsing is currently **not**
available for Microsoft ActiveDirectory servers.