php - 在回显形式中发送 php 变量

Question

当按钮被点击时，试图将一个自定义变量发送到 paypal，让自己陷入了一个困境

我目前坚持这就是我遇到的问题以及为什么交易没有正确执行

这是我的代码:

<?php
                $check = $mysqli->query("SELECT is_member FROM users WHERE username = '$username'");
                $row = $check->fetch_assoc();
                $isMember = $row['is_member'];
                if ($isMember == 0){
                echo'
                <p>To gain access to the members section and receive daily horse racing tips from our professionals purchase premium membership</a></p>
                <form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post" target="_top">
                <input type="hidden" name="custom" value="$id;">
                <input type="hidden" name="cmd" value="_s-xclick">
                <input type="hidden" name="hosted_button_id" value="CVWJZN5AALBVJ">
                <input type="image" src="https://www.sandbox.paypal.com/en_US/GB/i/btn/btn_subscribeCC_LG.gif" border="0" name="submit" alt="PayPal – The safer, easier way to pay online.">
                <img alt="" border="0" src="https://www.sandbox.paypal.com/en_GB/i/scr/pixel.gif" width="1" height="1">
                </form>
                ';

                }else{
                echo'<p> You are a member, <a href="membership.php">click here</a> to access the membership page </p>';
                }
                ?>

我遇到的问题是这一行:

<input type="hidden" name="custom" value="$id;">

将用户 ID 发送到 paypal。我知道如何正常执行此操作，但因为我已经回显了表单，所以我认为我不需要使用新的 php 标记来回显变量

我尝试了很多不同的传递方式，只是想得到正确的一种!

Answer 1

只是一个快速的解决方案:

像这样写那行:

'<input type="hidden" name="custom" value="' . $id . '">'

完整代码:

$check = $mysqli->query("SELECT is_member FROM users WHERE username = '$username'");
                $row = $check->fetch_assoc();
                $isMember = $row['is_member'];
                if ($isMember == 0){
                echo'
                <p>To gain access to the members section and receive daily horse racing tips from our professionals purchase premium membership</a></p>
                <form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post" target="_top">
                <input type="hidden" name="custom" value="' . $id . '">
                <input type="hidden" name="cmd" value="_s-xclick">
                <input type="hidden" name="hosted_button_id" value="CVWJZN5AALBVJ">
                <input type="image" src="https://www.sandbox.paypal.com/en_US/GB/i/btn/btn_subscribeCC_LG.gif" border="0" name="submit" alt="PayPal – The safer, easier way to pay online.">
                <img alt="" border="0" src="https://www.sandbox.paypal.com/en_GB/i/scr/pixel.gif" width="1" height="1">
                </form>
                ';

                }else{
                echo'<p> You are a member, <a href="membership.php">click here</a> to access the membership page </p>';
                }

如果我是你，我会怎么做:

<?php
$check = $mysqli->query("SELECT is_member FROM users WHERE username = '$username'");
                    $row = $check->fetch_assoc();
                    $isMember = $row['is_member'];
                    if ($isMember == 0){
                    ?>
                    <p>To gain access to the members section and receive daily horse racing tips from our professionals purchase premium membership</a></p>
                    <form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post" target="_top">
                    <input type="hidden" name="custom" value="<?php echo $id; ?>">
                    <input type="hidden" name="cmd" value="_s-xclick">
                    <input type="hidden" name="hosted_button_id" value="CVWJZN5AALBVJ">
                    <input type="image" src="https://www.sandbox.paypal.com/en_US/GB/i/btn/btn_subscribeCC_LG.gif" border="0" name="submit" alt="PayPal – The safer, easier way to pay online.">
                    <img alt="" border="0" src="https://www.sandbox.paypal.com/en_GB/i/scr/pixel.gif" width="1" height="1">
                    </form>
                    <?php

                    }else{
                    echo'<p> You are a member, <a href="membership.php">click here</a> to access the membership page </p>';
                    }
?>