验证PHP中的多个复选框。必须至少选中一个但不超过三个复选框 [英] Validating multiple check boxes in PHP. Must check at least one but not more than three checkboxes

问题描述

我使用PHP创建投票系统，我有一个表单，我插入到MySQL数据库。我将使用JavaScript来确保用户至少选择一个候选，但不超过三个，但我想在服务器端验证。以下是网页的网络表单：

I am using PHP to create a voting system and I have a form that I am inserting into MySQL database. I am going to use JavaScript to ensure that the user selects at least one candidate but not more than three, but I want to validate on the server side as well. Here is the web form for the page:

<form method="post" action="post.php">
<input type="checkbox" name="vote[FR01]" value="ON"> Freshman Candidate 1 <br />
<input type="checkbox" name="vote[FR02]" value="ON"> Freshman Candidate 2 <br />
<input type="checkbox" name="vote[FR03]" value="ON"> Freshman Candidate 3 <br />
<input type="checkbox" name="vote[FR04]" value="ON"> Freshman Candidate 4 <br />
<input type="checkbox" name="vote[FR05]" value="ON"> Freshman Candidate 5 <br />
<input type="checkbox" name="vote[FR06]" value="ON"> Freshman Candidate 6 <br />
<input type="submit" name="submit" value="submit">
</form>

我知道我需要使用一个for循环，但是任何人都可以解释如何使用这些数组键索引是数据库中的列名称？

I know I will need to use a for loop however, could anyone explain how I could use those array key indexes which are the column names in the database?

推荐答案

如何？

if (isset($_POST['submit'])) {
    $checkedCandidates = 0;
    $values = $_POST['vote'];
    $checkedCandidates = count($values);

    if ($checkedCandidates < 1) {
        echo 'You need to check at least one candidate.';
    } elseif ($checkedCandidates >= 4) {
        echo 'You can only check up to three candidates.';
    } else {
        echo 'Checked candidates: ' . var_dump($values);
    }
}

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