php - 在 PHP 中使用 PayPal IPN 获取自定义字段

Question

所以在我的网站上，人们可以通过单击“立即付款”购买他们想要的升级并在框中输入他们的用户名来订购升级。到目前为止，我会进入 PayPal，查看付款，查看 Minecraft 用户名字段，然后手动升级。现在我想开始使用 IPN，这样我就可以自动化我一直在做的所有工作。

这是升级选项的 HTML 代码:

<div class=donationBox>

<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_s-xclick">
<input type="hidden" name="hosted_button_id" value="W2RH7VA3YS3Y4">
<table>
<tr>
<td width=75%><h2>Custom Maps - $5.00</h2></td>
<td><input type="hidden" name="on0" value="Minecraft Username">Minecraft Username<input type="text" name="os0" maxlength="200"></td>
</tr>
<tr>

<td>The ability to upload any map you want to play on! Maybe a survival island map? You bet! Or the Hunger Games!</td>
<td><input type="submit" class="btn btn-primary" value="Buy Now" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!"></td>
</tr>
</table>
</form>
</div>

这里是 PHP 代码，用于简单地向我发送一封电子邮件，其中包含我需要尝试使其正常工作的信息:

  <?php

  // STEP 1: Read POST data

  // reading posted data from directly from $_POST causes serialization 
  // issues with array data in POST
  // reading raw POST data from input stream instead. 
  $raw_post_data = file_get_contents('php://input');
  $raw_post_array = explode('&', $raw_post_data);
  $myPost = array();
  foreach ($raw_post_array as $keyval) {
    $keyval = explode ('=', $keyval);
    if (count($keyval) == 2)
       $myPost[$keyval[0]] = urldecode($keyval[1]);
  }
  // read the post from PayPal system and add 'cmd'
  $req = 'cmd=_notify-validate';
  if(function_exists('get_magic_quotes_gpc')) {
     $get_magic_quotes_exists = true;
  } 
  foreach ($myPost as $key => $value) {        
     if($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1) { 
          $value = urlencode(stripslashes($value)); 
     } else {
          $value = urlencode($value);
     }
     $req .= "&$key=$value";
  }


  // STEP 2: Post IPN data back to paypal to validate

  $ch = curl_init('https://www.paypal.com/cgi-bin/webscr');
  curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
  curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
  curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));

  // In wamp like environments that do not come bundled with root authority certificates,
  // please download 'cacert.pem' from "http://curl.haxx.se/docs/caextract.html" and set the directory path 
  // of the certificate as shown below.
  // curl_setopt($ch, CURLOPT_CAINFO, dirname(__FILE__) . '/cacert.pem');
  if( !($res = curl_exec($ch)) ) {
      // error_log("Got " . curl_error($ch) . " when processing IPN data");
      curl_close($ch);
      exit;
  }
  curl_close($ch);


  // STEP 3: Inspect IPN validation result and act accordingly

  if (strcmp ($res, "VERIFIED") == 0) {
  // check whether the payment_status is Completed
  // check that txn_id has not been previously processed
  // check that receiver_email is your Primary PayPal email
  // check that payment_amount/payment_currency are correct
  // process payment

  // assign posted variables to local variables
  $item_name = $_POST['item_name'];
  $item_number = $_POST['item_number'];
  $payment_status = $_POST['payment_status'];
  $payment_amount = $_POST['mc_gross'];
  $payment_currency = $_POST['mc_currency'];
  $txn_id = $_POST['txn_id'];
  $receiver_email = $_POST['receiver_email'];
  $payer_email = $_POST['payer_email'];
  $custom = $_POST['on0'];
  $message = "An order has been IPNified! " . $item_name . " " . $item_number . " " . $payment_amount . " " . $txn_id . " " . $custom;
  mail('myemail@gmail.com', 'PayPal IPN', $message);
  } else if (strcmp ($res, "INVALID") == 0) {
      mail('myemail@gmail.com', 'PayPal IPN', 'Errors');
  }
  ?>

我遇到的问题是:

$custom = $_POST['on0'];

我按照上面的方法试过了，然后:

$custom = $_POST['custom'];

第一个是因为这是 Minecraft 用户名字段的名称，第二个是我尝试过的，因为我读到它应该是这样的，但无论哪种方式，它都没有返回任何内容。任何帮助都会很棒!谢谢!

Answer 1

转储 $_POST 的结果并查看哪个键符合您要查找的值。使用 var_dump或 print_r

// Displays more detail such as value types
var_dump($_POST);

// Only displays key => value relationships of an array
print_r($_POST);

编辑

我刚刚意识到使用 ipn 无法看到它的输出。在这种情况下，您始终可以序列化整个$_POST 数组并将其通过电子邮件发送。

$post_data_string = serialize($_POST);
mail('myemail@gmail.com', 'PayPal IPN', $post_data_string);