สอบถามการเชื่อมต่อ odbc_connect() จะ set utf8 ยังไงครับ ให้มันแสดงภาษาไทยได้ครับ

function tis_utf8($tis){
	$max=strlen($tis);
	$utf8 = "";
	for( $i=0 ; $i< $max; $i++ ){
		$s = substr($tis, $i, 1);
		$val = ord($s);
		if( $val < 0x80 ){
			$utf8 .= $s;
		} elseif ((0xA1 <= $val and $val <= 0xDA) or (0xDF <= $val and $val <= 0xFB)){
			$unicode = 0x0E00 + $val - 0xA0;
			$utf8 .= chr( 0xE0 | ($unicode >> 12) );
			$utf8 .= chr( 0x80 | (($unicode >> 6) & 0x3F) );
			$utf8 .= chr( 0x80 | ($unicode & 0x3F) );
		}
	}
	return $utf8;
}

function utf8_tis($string){
	$str = $string;
	$res = "";
	for ($i = 0; $i < strlen($str); $i++){
		if (ord($str[$i]) == 224){
			$unicode = ord($str[$i+2]) & 0x3F;
			$unicode |= (ord($str[$i+1]) & 0x3F) << 6;
			$unicode |= (ord($str[$i]) & 0x0F) << 12;
			$res .= chr($unicode-0x0E00+0xA0);
			$i += 2;
		}else{
			$res .= $str[$i];
		}
	}
	return $res;
}

$serverName = "nameserver";
$connectionInfo = array( "Database"=>"namedatabase", "UID"=>"userName", "PWD"=>"password" ,"CharacterSet" => "UTF-8");
$conn = sqlsrv_connect( $serverName, $connectionInfo);