组的PHP LDAP成员

我在windows AD中有组和用户，我想检查成员是否是组的一部分。示例：

user1 is in a group 1
         group 1 in group 2

然后我也应该看到组2中的用户1。在这种情况下，我希望得到结果1或0连接正常，但搜索语句中存在问题。

$username = $_POST["username"];
$passw = $_POST["password"];

$ldap_dn = " OU=MANAGER GROUP,OU=ALL GROUPS,DC=domain,DC=uk";
$ldap_svr = "domain.uk";
$ldap_domain = "@domain.uk";
$conn=ldap_connect($ldap_svr) or die("Cannot connect to LDAP server!");
ldap_set_option ($conn, LDAP_OPT_REFERRALS, 0);
ldap_set_option($conn, LDAP_OPT_PROTOCOL_VERSION, 3);
ldap_bind($conn,$username.$ldap_domain , $passw);

    $filter="(&(objectClass=user)(memberOf=CN=Group1,OU=MANAGER GROUP,OU=ALL GROUPS,DC=domain,DC=uk))";
    $justthese = array("cn", "sn", "givenname", "mail");
    $sr=ldap_search($conn, $ldap_dn, $filter, $justthese);
    $info = ldap_get_entries($conn, $sr);
    echo $info["count"]." entries returned'n";