มีปัญหาเกี่ยวกับ php connect oracle 11g 64bit แสดงข้อมูลหน้าเว็บเป็น ??????

	$config['odbc_datasource'] = "server";
    $config['odbc_username'] = "USER1";
    $config['odbc_password'] = "PASS1";
    $config['odbc_collation'] = "TIS-620";
    $odbc = new myODBC($config['odbc_datasource'],$config['odbc_username'],$config['odbc_password']);
    $odbc->setCollation($config['odbc_collation'],"UTF-8");

    class myODBC {
        var $_conn;
        function __construct($datasource,$username="",$password=""){
            $this->_conn = odbc_connect($datasource,$username,$password,SQL_CUR_USE_ODBC);
            $this->setCollation();
        }
		/**** function connect to database ****/

        function query($query,$debug = false){
            $dataset = array();
            $query = iconv($this->_collation2,$this->_collation1,$query);
            $result = odbc_exec($this->_conn,$query);
            while($row = @odbc_fetch_array($result)){
                $item = array();
                foreach($row as $key => $data){
                    $datax = iconv($this->_collation1,$this->_collation2,$data);
                    $item[$key] = $datax;
                }
                $dataset[] = $item;
            }
            if($debug){
                echo $query;
            }
            return $dataset;
        }
		
        function setCollation($collation1 = "UTF-8",$collation2 = "UTF-8"){
            $this->_collation1 = $collation1;
            $this->_collation2 = $collation2;
        }

        function close (){
            odbc_close($this->_conn);
        }
    }