一个简单的PHP投票程序
我们利用一个文件(data.dat)来存储投票栏目.每个栏目占据一行.
这样一来,便可随意加入和减去想要投票的栏目.
我们再利用一个文件(votes.dat)来存储我们的投票结果.
并纪录最近一位投票者的ip地址,简单的防止一人多投.
所以,您应该在该程序目录下自行建立两个文件data.dat和votes.dat
程序运行过程部分
程序运行时应该先有一个投票的HTML表单,等待投票.
当有人在HTML表单上投票时,判断它的IP是否为最近一位投票者的IP,
如果此人刚刚投过票,则两个值应该相等,显示"您已投过票了,谢谢您的参与!"
如果此人没投过票,则两个值不等,将它的投票写入文件(votes.dat)
(这里得到投票者的IP方法是:Web客户机在对服务器发送请求时需要提供一个表识,
这个表识就存储在环境变量REMOTE_ADDR里,我们引用它就可以了.)
最后是显示投票结果,通常我们是以"条形图表+百分数"来显示投票情况.
所以,我们要选择一个颜色单一的矩形图形,以适应横向缩放的要求.
--------------------------------------------------------------------------------
程序代码部分 可下载程序代码
//投票栏目存储文件,您可更改文件名
$data="data.dat";
//投票结果储存文件
$votes="votes.dat";
//用以显示投票结果比例的图形文件名图形文件名,
//用单一颜色的矩形较好,方便投票结果横向缩放,
//自行上传到本程序目录下
$path_img="vote.gif";
//投票标题
$poll_name="您喜欢我的哪个栏目?";
// 以下部分不需改动 //
//打开投票栏目文件,并以数组的形式将全部内容存在变量$dataf中备用
$dataf=file($data);
if ($go !=1)
{
//显示投票程序表单
echo "$poll_name
n";
echo "";
echo "查看结果";
}
else
{
// $go==1 表示有人投票, // 现在将投票情况以另外一种方式从文件中读出 $file_votes=fopen($votes, "r");
$line_votes=fgets($file_votes, 255);
fclose($file_votes);
// 并将数据按指定的字串切开,再将字串传回到阵列变量中
$single_vote=explode("|", $line_votes);
//准备写入投票结果
if ($result!=1)
{
//检查IP地址是否重复
$file_votes=file($votes, "r");
if ($REMOTE_ADDR == $file_votes[1])
{
echo "
exit;
}
//如果IP不重复,则执行以下程序
$ficdest=fopen($votes, "w");
for ($i=0; $i
{
//判断投了那一个栏目
if ($i == $vote)
{
$single_vote[$i]+=1;
}
//将数据写回文件
fputs($ficdest, "$single_vote[$i]|");
}
//写入投票者IP
fputs($ficdest, "n$REMOTE_ADDR");
fclose($ficdest);
$result=1; //投票成功
}
//写入投票结果后并显示投票结果
if ($result==1)
{ echo "
echo "$dataf[$i] |
"; echo " ![]() //输出百分数 PRintf("%.1f", "$stat[$i]"); echo "% |
"; //输出本栏目投票数 echo "$single_vote[$i]"; echo " |
";
echo "总投票数:$tot_votes ";
}
}
?>

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