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php - 使用单选按钮和复选框的投票系统 (PHP)

转载 作者：行者123 更新时间：2023-11-29 20:57:35 26 4
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我有三个 PHP 页面。登录、投票和投票流程。在投票页面，用户可以为候选人投票。有单选按钮和复选框。以下是投票页面的代码:

    <?php
error_reporting(E_ALL & ~E_NOTICE);
session_start();

if (isset($_SESSION['uname'])) {
    $username = $_SESSION['uname'];
}

else {
    header('Location: login_user.php');
    die();
}
?>

<html>
<head>
    <title>Trinity University of Asia Voting System</title>
</head>
<body>
    <img src="images/tua_logo.jpg"><marquee>Practice your right to vote.</marquee><br>

    <center>
        <a href="/">Home</a> | <a href="results.php">Results</a> | <a href="logout.php">Logout</a><br>
        <h3>Cast Your Vote</h3>
        <form action="processvoting.php" method="post">
        <table cellpadding="4" border="1">
            <tr>
                <th>Position</th>
                <th>Choice 1</th>
                <th>Choice 2</th>
            </tr>
            <tr>
                <th>President</th>
                <td><input type="radio" name="president" value="pres1">&nbsp;JOHN MICHAEL KALEMBE<br>College of Business Administration</td>
                <td><input type="radio" name="president" value="pres2">&nbsp;SUZAN JOHN<br>College of Education</td>
            </tr>
            <tr>
                <th>Vice President</th>
                <td><input type="radio" name="vice_president" value="vicepres1">&nbsp;JULIUS SAMWEL<br>College of Medical Technology</td>
                <td><input type="radio" name="vice_president" value="vicepres2">&nbsp;JEUNICE MARIANO<br>College of Business Administration</td>
            </tr>
            <tr>
                <th>Secretary</th>
                <td><input type="radio" name="secretary" value="sec1">&nbsp;ANGELO CHRSTIAN DE GUZMAN<br>College of Medical Technology</td>
                <td><input type="radio" name="secretary" value="sec1">&nbsp;MICHAEL SANGA<br>College of Hospitality and Tourism Management</td>
            </tr>
            <tr>
                <th>Treasurer</th>
                <td><input type="radio" name="treasurer" value="treas1">&nbsp;MARIE DANIELLE THEREZE VALDEZ<br>College of Hospitality and Tourism Management</td>
                <td><input type="radio" name="treasurer" value="treas1">&nbsp;JEUNICE MARIANO<br>College of Business Administration</td>
            </tr>
            <tr>
                <th>Auditor</th>
                <td><input type="radio" name="auditor" value="aud1">&nbsp;KOBI TSARLZ GONZALES<br>College of Computing and Information Sciences</td>
                <td><input type="radio" name="auditor" value="aud1">&nbsp;MARIAN ENTERO<br>College of Business Administration</td>
            </tr>
            <tr>
                <th>Business Manager</th>
                <td><input type="checkbox" name="bus_manager" value="bus1">&nbsp;MICAH EDILYN TAN<br>College of Arts and Sciences</td>
                <td>N/A</td>
            </tr>
            <tr>
                <th>Public Relations Officer (PRO)</th>
                <td><input type="checkbox" name="pro" value="pro1">&nbsp;MARIBETH LIAMZON<br>College of Education</td>
                <td>N/A</td>
            </tr>
        </table>
        <input type="submit" name="submit" value="Cast Your Vote">&nbsp;&nbsp;<input type="reset" value="Reset">
    </form>
</center>
</body>
</html>

用户投票后，他将被重定向到投票流程页面，代码如下:

<?php
error_reporting(E_ALL & ~E_NOTICE);
session_start();

if (isset($_SESSION['uname'])) {
    $username = $_SESSION['uname'];
}

else {
    header('Location: login_user.php');
    die();
}

include 'connection.php';

if(isset($_POST['submit'])) {
    $president = $_POST['president'];
    $vicepres = $_POST['vice_president'];
    $secretary = $_POST['secretary'];
    $treasurer = $_POST['treasurer'];
    $auditor = $_POST['auditor'];
    $businessmanager = $_POST['bus_manager'];
    $pro = $_POST['pro'];

    $conn = mysqli_connect('localhost', 'root', '', 'electiondb');

    if (!$conn) {
        die("Connecton failed: " . mysqli_connect_error());
    }

    $votesql = "SELECT voted FROM student_log WHERE username = '$username'";
    $query = mysqli_query($conn, $votesql);

    while($record = mysqli_fetch_array($query)) {
          $hasvoted = $record['voted'];
        }

    if ($hasvoted == 0) {

        if ($president == '') {
            echo "You cannot leave $president blank. Please go back and try again.";;
        }
        elseif ($vicepres == '') {
            echo "You cannot leave $vicepres blank. Please go back and try again.";
        }
        elseif ($secretary == '') {
            echo "You cannot leave $secretary blank. Please go back and try again.";
        }
        elseif ($treasurer == '') {
            echo "You cannot leave $treasurer blank. Please go back and try again.";
        }
        elseif ($auditor == '') {
            echo "You cannot leave $auditor blank. Please go back and try again.";
        }
        elseif ($businessmanager == ''){
            echo "You cannot leave $businessmanager blank. Please go back and try again.";
        }
        elseif ($pro == '') {
            echo "You cannot leave $pro blank. Please go back and try again.";
        }

        else {
            switch ($president) {
                case 'pres1':
                $votepres1 = "UPDATE vote_log SET choice1 = choice1+1 WHERE position = 'president'";
                $runpres1 = mysqli_query($conn, $votepres1);
                break;
                case 'pres2':
                $votepres2 = "UPDATE vote_log SET choice2 = choice2+1 WHERE position = 'president'";
                $runpres2 = mysqli_query($conn, $votepres2);
                break;
            }

            switch ($vicepres) {
                case 'vicepres1':
                $votevicepres1 = "UPDATE vote_log SET choice1 = choice1+1 WHERE position = 'vice_president'";
                $runvicepres1 = mysqli_query($conn, $votevicepres1);
                break;
                case 'vicepres2':
                $votevicepres2 = "UPDATE vote_log SET choice2 = choice2+1 WHERE position = 'vice_president'";
                $runvicepres2 = mysqli_query($conn, $votevicepres2);
                break;
            }

            switch ($secretary) {
                case 'sec1':
                $votesec1 = "UPDATE vote_log SET choice1 = choice1+1 WHERE position = 'secretary'";
                $runsec1 = mysqli_query($conn, $votesec1);
                break;
                case 'sec2':
                $votesec2 = "UPDATE vote_log SET choice2 = choice2+1 WHERE position = 'secretary'";
                $runsec2 = mysqli_query($conn, $votesec1);
                break;
            }

            switch ($treasurer) {
                case 'treas1':
                $votetreas1 = "UPDATE vote_log SET choice1 = choice1+1 WHERE position = 'treasurer'";
                $runtreas1 = mysqli_query($conn, $votetreas1);
                break;
                case 'treas2':
                $votetreas2 = "UPDATE vote_log SET choice2 = choice2+1 WHERE position = 'treasurer'";
                $runtreas2 = mysqli_query($conn, $votetreas2);
                break;
            }

            switch ($auditor) {
                case 'aud1':
                $voteaud1 = "UPDATE vote_log SET choice1 = choice1+1 WHERE position = 'auditor'";
                $runaud1 = mysqli_query($conn, $voteaud1);
                break;
                case 'aud2':
                $voteaud2 = "UPDATE vote_log SET choice2 = choice2+1 WHERE position = 'auditor'";
                $runaud2 = mysqli_query($conn, $voteaud2);
                break;
            }

            switch ($businessmanager) {
                case 'bus1':
                $votebus1 = "UPDATE vote_log SET choice1 = choice1+1 WHERE position = 'business_manager'";
                $runbus1 = mysqli_query($conn, $votebus1);
                break;
            }

            switch ($pro) {
                case 'pro1':
                $votepro1 = "UPDATE vote_log SET choice1 = choice1+1 WHERE position = 'pro'";
                $runpro1 = mysqli_query($conn, $votepro1);
                break;
            }

            $sqlforvoted = "UPDATE student_log SET voted = 1 WHERE username = '$username'";
            $processsql = mysqli_query($conn, $sqlforvoted) or die (mysqli_error($conn));
            echo "Thank you for voting. You may now logout of the system.<br><a href='logout.php'>Logout</a>";
        }
    }
    else {
        echo "You cannot vote more than once. <br><a href='logout.php'>Logout</a>";
    }
}

?>

<html>
<head>
    <title>Voting Process</title>
</head>
<body>
</body>
</html>

投票不会增加，但用户被视为“已投票”，因此用户一旦登录就无法再次投票。我唯一担心的是投票没有计算在内。我的代码有问题还是我对投票数的理解不够好？谢谢!

最佳答案

我认为您的 HTML 中有一些拼写错误。这里，选项是 pres1 和 pres2:

<td><input type="radio" name="president" value="pres1"> ... </td>
<td><input type="radio" name="president" value="pres2"> ... </td>

但在这里，两个选项都是sec1:

<td><input type="radio" name="secretary" value="sec1"> ... </td>
<td><input type="radio" name="secretary" value="sec1"> ... </td>

关于数据库交互，最好使用 PDO 和准备好的语句 - 它比大多数字符串连接方案更安全。检查此页面右侧的“相关”列 - 最有可能的问题是 this one这很好地解释了这个话题。

无论如何，这是对 submit 部分的不同看法，它只是删除了所有重复内容。它不使用 PDO(我没有添加任何数据库代码)，但至少最终查询中没有未经过滤的用户输入 - 只有预定义值:

if(isset($_POST['submit']) && !empty($_POST["submit"])) {

    if($hasvoted != 0){
        echo "You cannot vote more than once. <br><a href='logout.php'>Logout</a>";
        exit;
    }

    $positions = array(
        "president" => null, 
        "vice_president" => null,
        "secretary" => null,
        "treasurer" => null,
        "auditor" => null,
        "bus_manager" => null,
        "pro" => null
        );

    foreach (array_keys($positions) as $position)
    {
        if (!isset($_POST[$position]) || empty($_POST[$position])) {

            echo "All positions must be filled. Please try again.<br>";
            exit;
        }
        else{

            $choice = "";

            $choice_num = substr($_POST[$position], -1);

            if($choice_num == 1 || $choice_num == 2){
                $choice = "choice" . $choice_num;
            }
            else{
                echo "Error - invalid option";
                exit;
            }

            $positions[$position] = $choice;
        }

    }

    foreach (array_keys($positions) as $position)
    {
        $choice = $positions[$position];

        $sql_str = "UPDATE vote_log SET " . $choice ." = " . $choice . "+1 WHERE position = '" . $position . "'";

        // $sql_insert = mysqli_query($conn, $sql_str);

        echo $sql_str . "<br>";

    }


    echo "Thank you for voting. You may now logout of the system.<br><a href='logout.php'>Logout</a>";

}

关于php - 使用单选按钮和复选框的投票系统 (PHP)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37509975/

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