php mysql 导出csv excel格式文件并保存

$times = time();
 $filename = $times.".csv"; 
 $a = "联系人,联系电话,申请时间 "; 
 
 $days = postget("days");
 
 $mktime = daystomktime($days);
 $sql = "select * from  v_tugou where ($times-times)<$mktime";
 $db = new db();
 $result = $db->query( $sql );
 $rs = $db->fetch($result,0);
 foreach($rs as $v=>$vv)
 {  
 $a.=$vv['name'].','. $vv['mo'].",";
 $a.=date('y-m-d ',$vv['times'])." ";  
 }
 //echo $a;
 $hod = fopen ($filename,"w+");
 if( fwrite($hod,$a) )
 {
  echo "生成excel文件成功，点击<a href=$filename target=_blank>右击另存为excel文档</a>";
 }
 

 /*
 数据结构
 --
-- 表的结构 `hn_tugou`
--

create table if not exists `v_tugou` (
  `id` int(4) not null auto_increment,
  `name` varchar(20) not null default '0',
  `mo` varchar(20) not null default '0',
  `times` int(4) default null,
  `ip` varchar(20) not null default '0',
  primary key  (`id`)
) engine=myisam  default charset=utf8 auto_increment=2 ;

--
-- 导出表中的数据 `hn_tugou`
--

insert into `hn_tugou` (`id`, `name`, `mo`, `times`, `ip`) values
(1, 'adsense', 'www.111cn.net', 1283241159, '192.168.0.119');

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 */