/**
* 导出数据为excel表格
* @param
* array $data  一个二维数组,结构如同从数据库查出来的数组
* array $title  excel的第一行标题,一个数组,如果为空则没有标题
* String $filename 下载的文件名
*/
function exportexcel($data=array(),$title=array(),$filename='report'){
    header("Content-type:application/octet-stream");
    header("Accept-Ranges:bytes");
    header("Content-type:application/vnd.ms-excel");
    header("Content-Disposition:attachment;filename=".$filename.".xls");
    header("Pragma: no-cache");
    header("Expires: 0");
    //导出xls 开始
    if (!empty($title)){
      foreach ($title as $k => $v) {
        $title[$k]=iconv("UTF-8", "GB2312",$v);
      }
      $title= implode("\t", $title);
      echo "$title\n";
    }
    if (!empty($data)){
      foreach($data as $key=>$val){
        foreach ($val as $ck => $cv) {
          $data[$key][$ck]=mb_convert_encoding($cv,"GB2312","UTF-8");
        }
        $data[$key]=implode("\t", $data[$key]);
      }
      echo implode("\n",$data);
    }
}

$title = array("title1","title2","title3");
$data = array("数据1","数据2","数据3");
$fileName = "demo";
exportexcel($data,$title,$fileName);