PHP新手上路(九)

  • 作者:未知 来源:未知 添加时间:2006年7月2日 字体:

  • 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现你的这一构想。



    8.1 投票系统(mypolls.php3):



    <?

    $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>


    <?

    if(!isset($submit)){

    ?>

    <form action="myPolls.php3" method="get">

    <input type="radio" name="poll_voteNr" &#118alue="1" checked >

    <span class="pt9">信息量更大</span>


    <input type="radio" name="poll_voteNr" &#118alue="2" >

    <span class="pt9">网页更精美</span>


    <input type="radio" name="poll_voteNr" &#118alue="3" >

    <span class="pt9">没什么改进</span>


    <input type="radio" name="poll_voteNr" &#118alue="4" >

    <span class="pt9">其它</span>


    <input type="submit" name="submit" &#118alue="OK">

    <input type="hidden" name="poll" &#118alue="vote">

    <A HREF="myPolls.php3?submit=OK" class="p9">查看调查结果</A>

    </form>

    <?

    /*

    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 "
    ";

    echo "<input type="submit" name="Submit1" &#118alue="返回主页" &#111nClick="javascript:location='http://gophp.heha.net/index.html'";>";

    echo " <input type="submit" name="Submit2" &#118alue="重新投票" &#111nClick="javascript:location='http://gophp.heha.net/mypolls.php3'";>";

    if(isset($poll)){

    // write counter file

    $fp = fopen($coutfile, "wt");

    reset($curArray);

    while (list($Key, $&#118alue) = each($curArray))

    {

    $tmp = sprintf( "%s %dn", $Key, $&#118alue);

    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。 

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