แทรกข้อความภาษาไทย C# ส่งมาให้ php webservice แทรกข้อมูลลง ms sql ข้อความเป้น ??? รบกวนด้วยครับ

<?php

require_once("lib/nusoap.php");

//Create a new soap server
$server = new soap_server();
$objConnect = mssql_connect("ITUCHKUB-PC", "sa", "aa") or die("Error Connect to Database");
$objDB = mssql_select_db("Medical_Records");
//Define our namespace
$namespace = "https://www.thaicreate.com/android/WebServiceServer.php";
$server->wsdl->schemaTargetNamespace = $namespace;

//Configure our WSDL
$server->configureWSDL("HelloWorld");


// Register our method and argument parameters


$BorrowOPD = array(
    'HN' => "xsd:string",
    'department' => "xsd:string",
    'check_R,' => "xsd:string",
    'name_B,' => "xsd:string",
    'position_b,' => "xsd:string",
);

$ReturnOPD = array(
    'HN' => "xsd:string",
    'name_r,' => "xsd:string",
    'position_r,' => "xsd:string",
);

$server->register('BorrowOPD', $BorrowOPD, array('return' => 'xsd:string'));
$server->register('ReturnOPD', $ReturnOPD, array('return' => 'xsd:string'));

function BorrowOPD($HN, $department, $check_R, $name_B, $position_b) {



    $strSQL = "SELECT [HN],[FIRSTNAME],[LASTNAME] FROM PATIENT_NAME WHERE HN = '$HN'";
     
    $objQuery = @mssql_query($strSQL);
    $objSelect = @mssql_fetch_array($objQuery);


    
    
    if (!$objSelect) {
        $state = "not found";
    } else {

        $Tim = date("H:i");
        $da = date("d/m/Y");

        $strSQL2 = "SELECT * FROM OPD_LogBR WHERE HN = '$HN' AND date_R IS NULL";
        $objQuery2 = @mssql_query($strSQL2);
        $objSelect2 = @mssql_fetch_array($objQuery2);

        if (!$objSelect2) {


            $HN = "$objSelect[HN]";
            $name = "$objSelect[FIRSTNAME]";
            $sername = "$objSelect[LASTNAME]";
            $Tim = date("H:i");
            $da = date("d/m/Y");


            $strSQL = "INSERT INTO OPD_LogBR (HN,name,sername,department,check_R,date_b,time_b,name_borrow,position_b) VALUES ('$HN','$name','$sername','$department','$check_R','$da','$Tim','$name_B','$position_b')";
            $objInsert = @mssql_query($strSQL);

            $state = "Record inserted";
        } else {
            $state = "Record already";
        }
    }

    return $state;
}

function ReturnOPD($HN, $name_R, $position_R) {

    $strSQL = "SELECT * FROM OPD_LogBR WHERE HN = '$HN' AND date_R IS NULL";
    $objQuery = @mssql_query($strSQL);
    $objSelect = @mssql_fetch_array($objQuery);


    if (!$objSelect) {
        $state = "not found";
    } else {


        $Tim = date("H:i");
        $da = date("d/m/Y");


        $strSQL2 = "UPDATE OPD_LogBR SET date_r='$da',time_r='$Tim',name_return='$name_R',position_r='$position_R' WHERE HN = '$HN'";
        $objUpdate = @mssql_query($strSQL2);

        $state = "Record Update";
    }


    return $state;
}

// Get our posted data if the service is being consumed
// otherwise leave this data blank.
$POST_DATA = isset($GLOBALS['HTTP_RAW_POST_DATA']) ? $GLOBALS['HTTP_RAW_POST_DATA'] : '';

// pass our posted data (or nothing) to the soap service
$server->service($POST_DATA);
exit();
?>