Php 如何从PayPal IPN添加结果以更新数据库

我期待能够从贝宝IPN帖子的信息，并使用某些项目来更新我的数据库。这是我的ipn.php的当前代码

<?php
// tell PHP to log errors to ipn_errors.log in this directory
ini_set('log_errors', true);
ini_set('error_log', dirname(__FILE__).'/ipn_errors.log');

// intantiate the IPN listener
include('ipnlistener.php');
$listener = new IpnListener();

// tell the IPN listener to use the PayPal test sandbox
$listener->use_sandbox = true;

// try to process the IPN POST
try {
$listener->requirePostMethod();
    $verified = $listener->processIpn();
} catch (Exception $e) {
    error_log($e->getMessage());
    exit(0);
}

if ($verified) {

$errmsg = '';   // stores errors from fraud checks

// 1. Make sure the payment status is "Completed" 
if ($_POST['payment_status'] != 'Completed') { 
    // simply ignore any IPN that is not completed
    exit(0); 
}

// 2. Make sure seller email matches your primary account email.
if ($_POST['receiver_email'] != 'PRIMARY EMAIL ADDRESS') {
    $errmsg .= "'receiver_email' does not match: ";
    $errmsg .= $_POST['receiver_email']."\n";
}

// 3. Make sure the currency code matches
if ($_POST['mc_currency'] != 'USD') {
    $errmsg .= "'mc_currency' does not match: ";
    $errmsg .= $_POST['mc_currency']."\n";
}

// 4. Ensure the transaction is not a duplicate.
mysql_connect('localhost', '[DB_USER]', '[DB_PW') or exit(0);
mysql_select_db('DB_NAME') or exit(0);

$txn_id = mysql_real_escape_string($_POST['txn_id']);
$sql = "SELECT COUNT(*) FROM orders WHERE txn_id = '$txn_id'";
$r = mysql_query($sql);

if (!$r) {
    error_log(mysql_error());
    exit(0);
}

$exists = mysql_result($r, 0);
mysql_free_result($r);

if ($exists) {
    $errmsg .= "'txn_id' has already been processed: ".$_POST['txn_id']."\n";
}

if (!empty($errmsg)) {

    // manually investigate errors from the fraud checking
    $body = "IPN failed fraud checks: \n$errmsg\n\n";
    $body .= $listener->getTextReport();
    mail('NOTIFICATION EMAIL ADDRESS', 'IPN Fraud Warning', $body);

} else {

    <?php 
    $csvData = file_get_contents($_POST['custom']); 
    $csvNumColumns = 3; 
    $csvDelim = ";"; 
    $data = array_chunk(str_getcsv($csvData, $csvDelim), $csvNumColumns); 
    ?>

    // add this order to a table
    $user_id = mysql_real_escape_string($_POST['item_name']);
    $credit_amount = mysql_real_escape_string($_POST['item_number']);
    $type = mysql_real_escape_string($_POST['custom']);

    $sql = "INSERT INTO TABLE_NAME VALUES 
         (NULL, '$user_id', '$credit_amount', '$type')";

    if (!mysql_query($sql)) {
        error_log(mysql_error());
        exit(0);

    }


}

} else {
    // manually investigate the invalid IPN
    mail('NOTIFICATION EMAIL ADDRESS', 'Invalid IPN', $listener->getTextReport());
}

?>

//将此订单添加到表中
$user\u id=mysql\u real\u escape\u字符串（$\u POST['item\u name']）；
$credit\u amount=mysql\u real\u escape\u字符串（$\u POST['item\u number']）；
$type=mysql\u real\u escape\u字符串（$\u POST['custom']）；
$sql=“插入到表中\u名称值
（空，“$user_id”、“$credit_amount”、“$type”）；
if（！mysql_query（$sql））{
错误日志（mysql\u error（））；
出口（0）；
}
}
}否则{
//手动调查无效的IPN
邮件（'NOTIFICATION EMAIL ADDRESS'，'Invalid IPN'，$listener->getTextReport（））；
}
?>

在使用PayPal Sandbox的IPN测试服务进行测试时，这似乎工作正常，我可以为item_name、item_number和custom输入所需的值（或者使用以下代码时）

您可以传递多个值，并将它们填充到单个变量中，例如变量“custom”。这不会有什么问题。过去我自己也做过这件事。当我编写此代码时，我使用|分隔值，然后让我的IPN解析出我的IPN脚本中的值。
是的，很好，我不能说我100%熟悉PHP，我以前也从未使用过IPN（脚本中预配置的侦听器除外），我不确定如何让我的IPN解析出脚本中的值，然后将它们定义为单独的值，如果您可以发布用于此的代码片段，我相信我将能够调整它并使用它来解决我的问题。另外，当两个值匹配时，您对如何更新行而不是创建新行有何想法？非常感谢。
<form name="_xclick" action="https://www.sandbox.paypal.com/cgi-bin/webscr" 
    method="post">
    <input type="hidden" name="cmd" value="_xclick">
    <input type="hidden" name="business" value="SANDBOX EMAIL ADDRESS">
    <input type="hidden" name="currency_code" value="USD">
    <input type="hidden" name="amount" value="9.99">
    <input type="hidden" name="custom" value="<?=$this->package['0']['delivered'];?>"
    <input type="hidden" name="item_name" value="<?=$_SESSION["user_id"]?>"
    <input type="hidden" name="item_number" value="<?=$this->package['0']['number'];?>"
    <input type="hidden" name="return" value="WEBSITE_URL/success">
    <input type="hidden" name="notify_url" value="WEBSITE_URL/ipn.php">
    <input type="image" src="http://www.paypal.com/en_US/i/btn/btn_buynow_LG.gif" 
    border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
</form>

<input type="hidden" name="custom" value="<?=$_SESSION["user_id"]?>;<?=$this->package['0']['number'];?>;<?=$this->package['0']['delivered'];?>"

<?php 
    $csvData = file_get_contents($_POST['custom']); 
    $csvNumColumns = 3; 
    $csvDelim = ";"; 
    $data = array_chunk(str_getcsv($csvData, $csvDelim), $csvNumColumns); 
    ?>