ช่วยด้วยค่ะ เกี่ยวกับ LDAP ค่ะ Warning: ldap_bind(): Unable to bind to server: Invalid credentials in

$user = 'aaaa_b';
$password = 'xxxx';
$host = '192.168.1.31';
$port = 386;
$basedn = 'ou=xxx,dc=yyyyyy,dc=net';
$group = 'Users';
$ldaprdn = 'dc=yyyyyy,dc=net';
$domain='@xxx.com';


$ad = ldap_connect("ldap://$host", $port);
if ($ad) {
    echo "Connected" . "<br/>";
} else {
    echo ldap_error($ad) . "<br/>";
}
ldap_set_option($ad, LDAP_OPT_PROTOCOL_VERSION, 3);
ldap_set_option($ad, LDAP_OPT_REFERRALS, 0);

//  $ldapBind = ldap_bind($ad, "{$user}@{$domain}", $password); // 1.
//  $ldapBind = ldap_bind($ad, $user, $password); // 2.
  $ldapBind = ldap_bind($ad, $ldaprdn, $password); // 3.
//  $ldapBind = ldap_bind($ad, null, null); // 4.

if ($ldapBind) {
    echo "Binded" . "<br/>";
} else {
    echo ldap_error($ad) . "<br/>";
}

$basedn = 'ou=xxx,dc=yyyyyy,dc=net';
$group = 'Users';
$ldaprdn = 'dc=yyyyyy,dc=net';
$domain='@xxx.com';

$dn_host = '10.25.25.99';
$ldapusers = "[email protected]";
 $ldappasswd = "yourpassword";

$ldapconn = @ldap_connect($dn_host, 389)or die("Could not connect to LDAP Server.");
		ldap_set_option($ldapconn, LDAP_OPT_PROTOCOL_VERSION, 3);
		ldap_set_option($ldapconn, LDAP_OPT_REFERRALS, 0);

$ldapbind = @ldap_bind($ldapconn ,$ldapusers, $ldappasswd);

$dn_host = '10.25.25.99';
$ldapusers = "[email protected]";
 $ldappasswd = "yourpassword";

$ldapconn = @ldap_connect($dn_host, 389)or die("Could not connect to LDAP Server.");
		ldap_set_option($ldapconn, LDAP_OPT_PROTOCOL_VERSION, 3);
		ldap_set_option($ldapconn, LDAP_OPT_REFERRALS, 0);

$ldapbind = @ldap_bind($ldapconn ,$ldapusers, $ldappasswd);

echo ldap_error($ldapconn);

    protected static function adAccount($account, $password, $description) {
        $host = 'xxx';
        $domain = 'xx.xx.xx';
        $base_dn = 'dc=xx,dc=xx,dc=xx';

        $username = "{$account}@{$domain}";

        @$ldap_connect = ldap_connect("ldap://{$host}.{$domain}");

        if ($ldap_connect != false) {
            ldap_set_option($ldap_connect, LDAP_OPT_PROTOCOL_VERSION, 3);
            ldap_set_option($ldap_connect, LDAP_OPT_REFERRALS, 0);

            @$ldap_bind = ldap_bind($ldap_connect, $username, $password);

            if ($ldap_bind != false) {
                $filter = "(samaccountname={$account})";

                $search = ldap_search($ldap_connect, $base_dn, $filter);
                $info = ldap_get_entries($ldap_connect, $search);

                $description = $info[0]['description'][0];
            }

            ldap_unbind($ldap_connect);
        }

        return self::createUser($account, $description);
    }