PHP新手上路（九） 投票系统
建设一个简单交互的网站(五)
8. 投票系统
在许多时候，我们需要收集上网者和网友们的意见。例如：新版页面与旧版页面的比较；对某一事情的看法；对体育比赛结果的预测等等。这时候，你需要一个非常有效的网上调查系统。使用PHP就可以非常方便地实帜愕恼庖还瓜搿?
8.1 投票系统（mypolls.php3）：
<?php
$status=0;
if(isset($polled)&&($polled=="c-e")){
$status=1;
}
#echo "$status";
if(isset($poll)&&($status==0)){
setcookie("polled","c-e",time() 86400,"/");#time=24h
}
?>
<html>
<head>
<title>新版页面调查</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">
<!--
.tb { border="1" bordercolor="#009933" cellspacing="0" font-size: 9pt; color: #000000}
.head { font-family: "宋体"; font-size: 12pt; font-weight: bold; color: #009933; text-decoration: none}
.pt9 { font-size: 9pt}
a.p9:link { font-size: 9pt; color: #000000; text-decoration: none}
a.p9:visited { font-size: 9pt; color: #000000; text-decoration: none }
a.p9:hover { font-size: 9pt; color: #FF0000; text-decoration: underline}
a.p9:active { font-size: 9pt; color: #FF0000; text-decoration: underline }
-->
</style>
</head>
<body bgcolor="#FFFFFF">
<div class="head">与旧版页面相比较您觉得新版页面：</div><br>
<?
if(!isset($submit)){
?>
<form action="myPolls.php3" method="get">
<input type="radio" name="poll_voteNr" value="1" checked >
<span class="pt9">信息量更大</span> <br>
<input type="radio" name="poll_voteNr" value="2" >
<span class="pt9">网页更精美</span> <br>
<input type="radio" name="poll_voteNr" value="3" >
<span class="pt9">没什么改进</span> <br>
<input type="radio" name="poll_voteNr" value="4" >
<span class="pt9">其它</span> <br>
<input type="submit" name="submit" value="OK">
<input type="hidden" name="poll" value="vote">
<A HREF="myPolls.php3?submit=OK" class="p9">查看调查结果</A>
</form>
<?php
/*
如果想增加其它的选项可直接加上即可
*/
} else {
$descArray = array(
1 => "信息量更大",
2 => "网页更精美",
3 => "没什么改进",
4 => "其它"
);
$poll_resultBarHeight = 9; // height in pixels of percentage bar in result table
$poll_resultBarScale = 1; // scale of result bar (in multiples of 100 pixels)
$poll_tableHeader = "<table border=1 class=\"tb\">";
$poll_rowHeader = "<tr>";
$poll_dataHeader = "<td align=center>";
$poll_dataFooter = "</td>";
$poll_rowFooter = "</tr>";
$poll_tableFooter = "</table>";
$coutfile = "data.pol";
$poll_sum = 0;
// read counter-file
if (file_exists($coutfile)) {
$fp = fopen($coutfile, "rt");
while ($Line = fgets($fp, 10)) {
// split lines into identifier/counter
if (ereg("([^ ]*) *([0-9]*)", $Line, $tmp)) {
$curArray[(int)$tmp[1]] = (int)$tmp[2];
$poll_sum = (int)$tmp[2];
}
}
// close file
fclose($fp);
} else { //
for ($i = 1; $i <= count($descArray); $i) {
$curArray[$i] = 0;
}
}
if (isset($poll)) {
$curArray[$poll_voteNr];
$poll_sum;
}
echo $poll_tableHeader;
// cycle through all options编历数组
reset($curArray);
while (list($K, $V) = each($curArray)) {
$poll_optionText = $descArray[$K];
$poll_optionCount = $V;
echo $poll_rowHeader;
if ($poll_optionText != "") {
echo $poll_dataHeader;
echo $poll_optionText;
echo $poll_dataFooter;
if ($poll_sum) $poll_percent = 100 * $poll_optionCount / $poll_sum;
else $poll_percent = 0;
echo $poll_dataHeader;
if ($poll_percent > 0) {
$poll_percentScale = (int)($poll_percent * $poll_resultBarScale);
}
printf(" %.2f %% (%d)", $poll_percent, $poll_optionCount);
echo $poll_dataFooter;
}
echo $poll_rowFooter;
}
echo "总共投票次数:<font color=red> $poll_sum</font>";
echo $poll_tableFooter;
echo "<br>";
echo "<input type=\"submit\" name=\"Submit1\" value=\"返回主页\" onClick=\"javascript:location='http://gophp.heha.net/index.html'\">";
echo " <input type=\"submit\" name=\"Submit2\" value=\"重新投票\" onClick=\"javascript:location='http://gophp.heha.net/mypolls.php3'\">";
if (isset($poll)) {
// write counter file
$fp = fopen($coutfile, "wt");
reset($curArray);
while (list($Key, $Value) = each($curArray)) {
$tmp = sprintf("%s %dn", $Key, $Value);
fwrite($fp, $tmp);
}
// close file
fclose($fp);
}
}
?>
</body>
</html>注释：从上面我们可以看出该投票系统的基本过程：
1、打开文件取得数据到数组$curArray（文件不存在则初始化数组$curArray）
2、编历数组，处理数据得到所需值
3、计算百分比，控制统计bar图像宽度
4、将数据保存到"data.pol"中
这里有一点是需要注意：这里的data.pol文本文件需要有写权限。
文章链接：http://www.phprm.com/start/fs9.html
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