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一个简单的PHP投票程序

Jun 01, 2016 pm 02:31 PM

分析:
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 "$poll_name
n"; 
echo "
"; 
for ($i=0; $i
{ 
echo " $dataf[$i]
n"; } 

echo ""; 
echo "

"; 
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 "
您已投过票了,谢谢您的参与!    
";
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 ""; 
for ($i=0; $i
{ 
//取得投票总数
$tot_votes+=$single_vote[$i]; 
} 

for ($i=0; $i
{ 
//计算百分比 
$stat[$i]=$single_vote[$i]/$tot_votes*100; 
echo ""; 
} 

echo "
  • "; 
    echo "$dataf[$i]
  • "; 
    echo "一个简单的PHP投票程序 "; 
    //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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