php中csv文件的下载

使用header头部定义就可以，一下为阿拉蕾项目文件下载的部分代码：
$user_infos = “”;
if(!empty($download)) {
  　header("Content-type:text/csv;charset=utf-8");
    header("Content-Disposition:attachment;filename=player.csv");
    header('Expires:0');
    header('Pragma:no-cache');
    $str = '"A","B","C","D","E"'."\r\n";
    $str = iconv("utf-8","gb2312",$str);
    echo $str;
    foreach ($user_infos as $key=>$val) {
      echo '"'.$val['zone'].'"';
      echo ',"'.$val['sdk_id'].'"';
      echo ',"'.$val['uid'].'"';
      echo ',"'.$val['role_name'].'"';
      echo ',"'.$val['vip'].'"';
      echo ',"'.$val['last_ip'].'"';      echo "\r\n";    }      exit();{

}