关于投票有关问题

$n = 10;
$uid = 1;
$sqlstr = "select votenum from table where uid=".$uid." and date='2015-02-06'";
$result = mysql_query($sqlstr) or die(mysql_error());

if(!$result){
   $sqlstr = "insert into table(uid,date,votenum) values('".$uid."','".date('Y-m-d')."',1)";
   mysql_query($sqlstr) or die(mysql_error());
}elseif($result['votenum']>$n){
    echo '今天你已投票'.$n.'次，不能再投票';
    exit();
}else{
   $sqlstr = "update table set votenum=votenum+1 where uid=".$uid." and date='".date('Y-m-d')."'";
   mysql_query($sqlstr) or die(mysql_error());
}
// 執行投票代碼
echo '投票成功';