如何把数据导出变为excell文件呀

$head ="头";
         $head1 = date('Y-m-d H:i');
         $file_type="vnd.ms-excel";         $file_ending="xls";         header("Content-type:application/text");         //header("Content-Disposition:filename=test.xls");  // 这样可以但不能自动保存         header("Content-Disposition:attachment;filename=$head.$file_ending");  // 这一行为保存可是有错误         header("Pragma: no-cache");         header("Expires: 0");         $now_date = date('Y-m-d H:i');         $title = "数据表($head):生成日期:$head1";         echo("$title\n");         $sep = "\t";         $sep1= " ";          print("\n");?><?          $query = "select 值0,值1,值2 from  table ";          ora_parse($cur,$query);          ora_exec($cur);          $numCols = ora_numcols($cur);          for($col=0;$col<$numCols;$col++)          {              echo ora_columnname($cur,$col).$sep;          }          print("\n");          while(ora_fetch($cur))          {                $strrow = "";                for($i=0;$i<$numCols;$i++)                {                    $temp = ora_getcolumn($cur,$i);                    str_replace("\t"," ",$temp);                    str_replace("\'","\"",$temp);                    $strrow .=$temp.$sep;                }                $strrow .=$sep1;                print(trim($strrow));                print "\n";          }