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) $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";
}

/*
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.111com.net', 1283241159, '192.168.0.119');

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*/