使用PHP更新AD密码时出现问题

嗨，我已经编写了以下脚本来更新特定用户的密码

<?php
function create_ldap_connection() {
        $ip = "192.168.168.1";
        $ldaps_url = "192.168.168.1";
        $port = 389;
        $ldap_conn = ldap_connect($ldaps_url, $port) or die("Sorry! Could not connect to LDAP server ($ip)");
        $password = "password";
        $binddn = "CN=Administrator,CN=Users,DC=ad,DC=test,DC=com";
        $result = ldap_bind( $ldap_conn, $binddn, $password ) or die("  Error: Couldn't bind to server using provided credentials!");
        if($result) {
                return $ldap_conn;
        }
        else {
                die (" Error: Couldn't bind to server with supplied credentials!");
        }
}
function get_user_dn($ldap_conn, $user_name) {
        /* Write the below details as per your AD setting */
        $basedn = "OU=ITS Users,DC=ad,DC=test,DC=com";
        /* Search the user details in AD server */
        $searchResults = ldap_search($ldap_conn, $basedn, $user_name);
        if(!is_resource($searchResults)) die('Error in search results.');
        /* Get the first entry from the searched result */
        $entry = ldap_first_entry($ldap_conn, $searchResults);
        $info = ldap_get_entries($ldap_conn, $searchResults);
        echo $info["count"]." entries returned'n";
        return ldap_get_dn($ldap_conn, $entry);
}
function pwd_encryption($newPassword) {
        $newPassword = "'"" . $newPassword . "'"";
        $len = strlen($newPassword);
        $newPassw = "";
        for ($i = 0; $i < $len; $i++) {
                $newPassw .= "{$newPassword {$i}}'000";
        }
        $userdata["unicodePwd"] = $newPassw;
        return $userdata;
}
$user_name = "(|(sn=archieg*)(SamAccountName=archieg*))";
$user_password = "password!1234";
$ldap_conn = create_ldap_connection();
$userDn = get_user_dn($ldap_conn, $user_name);
$userdata = pwd_encryption ($user_password);
print_r($userdata);
//$result = ldap_mod_replace($ldap_conn, $userDn , $userdata);  /* Check whether the password updated successfully or not. */
$result = ldap_modify($ldap_conn, $userDn , $userdata);
if($result) {
        echo "Success attempting to modify password in AD";
}
else {
        echo "Error: Please try again later!'n";
        $e = ldap_error($ldap_conn);
        $e_no = ldap_errno($ldap_conn);
        echo $e . "'n";
        echo $e_no . "'n";
}
?>

然而，当我运行这个时，我得到了以下错误，

[root@web chpasswd]# php ad_change.php 
PHP Warning:  Module 'intl' already loaded in Unknown on line 0
1 entries returned
Array
(
    [unicodePwd] => "password!1234"
)
Error: Please try again later!
Server is unwilling to perform
53
[root@web chpasswd]# 

我在这里做错了什么？我一直在摆弄加密技术，但这也无济于事。我有Windows Server 2012 R2 Active Directory。

非常感谢