PHP新手上路(9)

建设一个简单交互的网站(五)

  1. 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:

?$status=0;if(isset($polled)($polled==c-e)){$status=1;}#echo $status;if(isset($poll)($status==0)){setcookie(polled,c-e,time()+86400,/);#time=24h}?htmlheadtitle新版页面调查/titlemeta  content=text/html; charset=gb2312style type=text/css!--.tb { border=1 bordercolor=#009933 cellspacing=0 font-size: 9pt; color: #000000}.head { font-family: 宋体; font-size: 12pt; font-weight: bold; color: #009933; text-decoration: none}.pt9 { font-size: 9pt}a.p9:link { font-size: 9pt; color: #000000; text-decoration: none}a.p9:visited { font-size: 9pt; color: #000000; text-decoration: none }a.p9:hover { font-size: 9pt; color: #FF0000; text-decoration: underline}a.p9:active { font-size: 9pt; color: #FF0000; text-decoration: underline }--/style/headbody bgcolor=#FFFFFFdiv class=head与旧版页面相比较您觉得新版页面:/divbr?if(!isset($submit)){?form action=myPolls.php3 method=getinput type=radio name=poll_voteNr value=1 checked span class=pt9信息量更大/span brinput type=radio name=poll_voteNr value=2 span class=pt9网页更精美/span brinput type=radio name=poll_voteNr value=3 span class=pt9没什么改进/span brinput type=radio name=poll_voteNr value=4 span class=pt9其它/span brinput type=submit name=submit value=OKinput type=hidden name=poll value=voteA 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-fileif (file_exists( $coutfile)){$fp = fopen( $coutfile, rt);while ($Line = fgets($fp, 10)){// split lines into identifier/counterif (ereg( ([^ ]*) *([0-9]*), $Line, $tmp)){$curArray[(int)$tmp[1]] = (int)$tmp[2];$poll_sum+=(int)$tmp[2];}}// close filefclose($fp);}else{//for ($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 $poll_tableFooter;echo br;echo input type=submit name=Submit1 value=返回主页 onClick=javascript:location=;echo  input type=submit name=Submit2 value=重新投票 onClick=javascript:location=;if(isset($poll)){// write counter file$fp = fopen($coutfile, wt);reset($curArray);while (list($Key, $Value) = each($curArray)){$tmp = sprintf( %s %dn, $Key, $Value);fwrite($fp, $tmp);}// close filefclose($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

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。

You can leave a response, or trackback from your own site.

Leave a Reply

网站地图xml地图