关于PHP Ldap 账户管理的问题

使用php链接ldap服务器，创建用户什么的都正常，但是设置账户选项里的东西时候会报以下错误
Warning: ldap_add() [function.ldap-add]: Add: Server is unwilling to perform
怎样才能对账户选项中的值做操作，求指导，谢谢

<?php
$ldap_host = "ldap://10.3.3.81";//LDAP 服务器地址
$ldap_port = "389";//LDAP 服务器端口号
$ldap_conn = ldap_connect($ldap_host, $ldap_port) or die("Can't connect to LDAP server");

ldap_set_option($ldap_conn, LDAP_OPT_PROTOCOL_VERSION, 3);
ldap_set_option($ldap_conn, LDAP_OPT_REFERRALS, 0);

$ldap_user = "administrator@suncloud.com"; //设定服务器用户名
$ldap_pwd = "2345.com"; //设定服务器密码
ldap_bind($ldap_conn, $ldap_user, $ldap_pwd) or die("Can't bind to LDAP server.");//与服务器绑定

$base_dn = "CN=zhenglu008,CN=Users,DC=suncloud,DC=com";
$entry = array(
"givenName" => "zheng",
"samaccountname"=>"zhenglu008",
"company" => "Test Inc",
"mail" => "123@234.com",
// "userAccountControl" => 66048,
);

$entry["objectClass"][0] = "top";
$entry["objectClass"][1] = "person";
$entry["objectClass"][2] = "organizationalPerson";
$entry["objectClass"][3] = "user";

//添加用户
ldap_add($ldap_conn, $base_dn, $entry) or die("Can't add new entry!");

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