isset函数仅适用于数据库中的第一个复选框

Question

<p>我有一个组件，它从 MySQL 数据库中获取所有数据。</p>

<!--?php

函数组件($productName, $productPrice, $productImg, $productID)
{
    $元素=“
            <div class='col-md-3 col-sm-6 my-3 my-md-0'-->;
            <form action="index.php" method="post" id="myform">;
                <div class="卡影">;
                    <img src="{$productImg}" alt="image1" class="img-fluid card-img-top">;
                    <div class="\“卡体\”">
                        <h5 class="card-title">{$productName}</h5>;
                    </div>
                    <p class='card-text'>此处显示信息 lorem ipsum</p>
                    <span class="price">{$productPrice}</span>;
                    <span class="price">{$productID}</span>;
                    <div class="form-check form-switch">;
                        <input class="form-check-input" type="checkbox" name="checkid[]" value="{$productID}">;
                    </div>
                    <输入类型='隐藏'名称='product_id'值='{$productID}'>

                </div>
            </表格>
        </form>

Answer 1

您每次循环都创建一个新的form元素。 您可以将您的函数更改为

function component($productName, $productPrice, $productImg, $productID)
{
    $element = "
                <div class='card shadow'>
                    <img src='{$productImg}' alt='image1' class='img-fluid card-img-top'>
                    <div class=\"card-body\">
                        <h5 class='card-title'>{$productName}</h5>
                    </div>
                    <p class='card-text'>info goes here lorem ipsum</p>
                    <span class='price'>{$productPrice}</span>
                    <span class='price'>{$productID}</span>
                    <div class='form-check form-switch'>
                        <input class='form-check-input' type='checkbox' name='checkid[]' value='{$productID}'>
                    </div>
                    <input type='hidden' name='product_id' value='{$productID}'>

                </div>
    ";
    echo $element;
}

以及在一个单独的表单中获取您的组件（上面的函数）和提交按钮的代码，如下：

<div class="container">
    <div class="row text-center py-5">
<div class='col-md-3 col-sm-6 my-3 my-md-0'>
            <form action='index.php' method='post' id='myform'>
        <?php
        $result = $database->getData();
        while ($row = mysqli_fetch_assoc($result)) {
            component($row['product_name'], $row['product_price'], $row['product_image'], $row['id']);
        }
        ?>
<button type="submit" name="submit" form="myform">show selected</button>
            </form>
        </div>
    </div>