LDAP SEARCH mit PHP - mehr als 1000 Einträge?

    // Verbindung mit dem LDAP-Server herstellen
    $ldap_connect = ldap_connect($ldap_host) or die( "Could not connect!" );  
    // Beim LDAP-Server authentifizieren
    ldap_set_option($ldap_connect, LDAP_OPT_PROTOCOL_VERSION, 3) or die ("Could not set ldap protocol");  
    ldap_set_option($ldap_connect, LDAP_OPT_REFERRALS, 0); 
    ldap_set_option($ldap_connect, LDAP_OPT_SIZELIMIT, 33);  
    $ldap_bind_anonym = ldap_bind($ldap_connect, "*************", "*************");  
    $filter = "objectclass=group";  
    $attrb = array("cn");  
    $ldap_search = ldap_search($ldap_connect, $base_dn, $filter, $attrb, 0, 0) or die ("Could not search!");   
    $ldap_result = ldap_get_entries($ldap_connect, $ldap_search);
    $counter = 0;
    foreach ($ldap_result AS $key => $ldap_value) {
      echo $ldap_value["cn"]."<br>";  
      $counter++;
    }
    echo $counter;

PHP Warning: ldap_search() [function.ldap-search.html]: Partial search results returned: Sizelimit exceeded. in D:\Inetpub\wwwroot\ad\login.php on line 17 

    ldap_set_option($ldap_connect, LDAP_OPT_SIZELIMIT, 33);