使用Zend_Ldap查询用户的所有组

Question

I haven't really got much to show because I'm not overly familiar with ldap (Open Directory) at all and I'm having a bit of trouble understanding how to actually query the groups of a particular user. Using Zend_Auth_Adapter_Ldap(),

$ldap = array(
    array('host' => 'od-master.foobar.net',
        'baseDn' => 'cn=users,dc=foobar,dc=net',
        'bindRequiresDn' => true,
        'accountCanonicalForm' => 2));

$authAdapter = new Zend_Auth_Adapter_Ldap($ldap);
// Set the input credential values to authenticate against
$authAdapter->setIdentity($form->getValue('username'));
$authAdapter->setCredential($form->getValue('password'));
//etc

I have the account being authenticated, but now I need to retrieve a list of groups this user belongs to. I'm not generally one to ask for help without trying stuff first, but I can't even get to that point. Any help is greatly appreciated.

In case my question wasn't obvious: how do you query all the groups of a particular user?

===== EDIT =====

As per suggestions given, this was my latest attempt:

$attributes = array('memberOf'); //also tried member
$users = $ldapAdapter->search('cn=username', $ldapAdapter->getBaseDn(), Zend_Ldap::SEARCH_SCOPE_SUB, $attributes);
foreach ($users as $user) {
   var_dump($user);
}

I did also try to do this outside of Zend_Ldap unsuccessfully.

$attributes = array('memberOf'); //also tried member
$result = ldap_search($ldapAdapter->getResource(), $baseDn, 'cn=username', $attributes);
$info = ldap_get_entries($ldapAdapter->getResource(), $result);

Which results in an empty array. Any further direction would be greatly appreciated.

===== EDIT 2 =====

So I tried to completely remove Zend_Ldap so I can test things easier, here is what I ended up with which results in array('count' => 0) returned.

$resource = ldap_connect('od-master.foobar.net', 389);
ldap_set_option($resource, LDAP_OPT_PROTOCOL_VERSION, 3);
$bind = ldap_bind($resource, 'uid=johnc,cn=users,dc=foobar,dc=net', '***');
$result = ldap_search($resource, 'cn=users,dc=foobar,dc=net', '(cn=username)');
$info = ldap_get_entries($resource, $result);

Answer 1

You just add to make a Ldap_Search in nod cn=users,dc=foobar,dc=net with a filter like cn=username for an attribute called memberOf.

When you write a SEARCH in LDAP you give :

1. The DN of the nod where begin the search
2. The attributes you want to retreive
3. the filter ((&(cn=username))
4. The deepness of your search and here it's subtree (not OneLevel, nor base)