sqlsrv query ผมจากcodeigniter ไม่สามารถ query ภาษาไทยได้ครับ set config แล้วกำหนดก้อแล้ว ก็ออกเป็น ??? ช่วยทีครับ

$connectionInfo = array("Database"=>$dbName, "UID"=>$userName, "PWD"=>$userPassword,
"MultipleActiveResultSets"=>true,"CharacterSet"  => 'UTF-8');

<?php
if ( ! defined('BASEPATH')) exit('No direct script access allowed');
//header('Content-Type: text/html; charset=UTF-8');
class Login extends CI_Controller
{


  public function __construct()
  {
    parent::__construct();
    // Your own constructor code
      $this->load->library('session');
    $this->DB = $this->load->database('dbu', TRUE);
    
    

  }



  public function CheckLogin()
  {
      echo '<meta charset="UTF-8">';
	  $username = $this->input->post("txtUser");
      $password = $this->input->post("txtPass");
      $rs = $this->DB->query("SELECT * FROM Point_CM_customer as pcc JOIN Point_CM_prefix on Point_CM_prefix.prefix_code=pcc.prefix_code where cust_idcard = '$username' and cust_status = 1");
      if ($rs->num_rows() > 0) {
          $row_namecus = $rs->row_array();
          echo "ยินดีต้อนรับคุณ ";
              echo $row_namecus['prefix_name_th'];
          echo $row_namecus['cust_firstname_th'];
        echo   $row_namecus['cust_lastname_th'];
          echo " เข้าสู่ระบบ";
          $this->session->set_userdata(array(
              'cust_idcard'   => $row_namecus['cust_idcard'],
              'prefix_name_th'   => $row_namecus['prefix_name_th'],
              'cust_firstname_th'  => $row_namecus['cust_firstname_th'],
              'cust_lastname_th'  => $row_namecus['cust_lastname_th']
          ));

      }else{
          echo "กรุณาสมัครสมาชิก";
      }
     /* if ($obj == "0") {
          echo "ชื่อผู้ใช้ หรือ รหัสผ่าน ไม่ถูกต้อง";
      } else {
          if ($emp_id != 'A00001') {
              $rs = $this->DB->query("SELECT user_code,user_status,date_modify FROM Point_CM_user_login where user_code = '$emp_id' and user_status = 1");
              if ($rs->num_rows() > 0) {
                  echo "ยินดีต้อนรับคุณ ";
                  echo $nameemp;
                  echo " เข้าสู่ระบบ";
                  $this->session->set_userdata(array(
                      'emp_id'       => $emp_id,
                      'useremp'      => $useremp,
                      'nameemp'       => $nameemp
                  ));
              }else{
                  echo "Permission Denied";
              }

          } else {
              echo "ข้อมูลผู้ใช้ไม่สมบูรณ์";
          }
      }*/
  }


 


}

function tis620_to_utf8($text) {
$utf8 = "";
for ($i = 0; $i < strlen($text); $i++) {
$a = substr($text, $i, 1);
$val = ord($a);

if ($val < 0x80) {
$utf8 .= $a;
} elseif ((0xA1 <= $val && $val < 0xDA) || (0xDF <= $val && $val <= 0xFB)) {
$unicode = 0x0E00+$val-0xA0; $utf8 .= chr(0xE0 | ($unicode >> 12));
$utf8 .= chr(0x80 | (($unicode >> 6) & 0x3F));
$utf8 .= chr(0x80 | ($unicode & 0x3F));
}
}
return $utf8;
}

<?php echo tis620_to_utf8($row['xxxx']);?> //ใช้อันนี้ดูครับ