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跟進my previous newbie question about Paypal，我有一個新的新手問題。我收到PayPal IPN時應該在哪裏執行UPDATE查詢？
我成功地獲得了一個PayPal沙盒設置，並在我的服務器上實現了一個PHP「偵聽器」，當我測試我的Paypal付款按鈕時，一切似乎都正常工作。所以看起來我擁有支付系統的基本骨架。
現在我對如何把它定製到我的需要的下一步感到有點困惑。我要複製the code offered on Paypal's site。我的希望和假設是我可以在Paypal告訴我支付已經到來的時候在代碼中找到一個位置。
但是，我不清楚這一點在哪裏。如果我根據付費或未付款設置某種「if」聲明，我看不出我將測試的價值。
我想要做的就是如果貝寶告訴我該人已經付款，那麼我的MySQL數據庫中的一個標誌將被標記爲「已付款」。它應該是定期付款，所以如果下一次自動付款失敗，那麼數據庫中的標誌應該標記爲「未付款」。
在他們的代碼中是否有地方可以用作添加自定義操作的起點？還是我需要完全使用其他代碼庫？
供參考，在這裏是有問題的PHP代碼：
<?php
error_reporting(E_ALL^E_NOTICE);
$email = $_GET['ipn_email'];
$header = "";
$emailtext = "";
// Read the post from PayPal and add 'cmd'
$req = 'cmd=_notify-validate';
if (function_exists('get_magic_quotes_gpc'))
{
$get_magic_quotes_exists = true;
}
foreach ($_POST as $key => $value)
// Handle escape characters, which depends on setting of magic quotes
{
if ($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1)
{
$value = urlencode(stripslashes($value));
}
else
{
$value = urlencode($value);
}
$req .= "&$key=$value";
}
// Post back to PayPal to validate
$header .= "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
$fp = fsockopen('ssl://www.paypal.com', 443, $errno, $errstr, 30);
// Process validation from PayPal
// TODO: This sample does not test the HTTP response code. All
// HTTP response codes must be handles or you should use an HTTP
// library, such as cUrl
if (!$fp)
{ // HTTP ERROR
}
else
{
// NO HTTP ERROR
fputs($fp, $header . $req);
while (!feof($fp))
{
$res = fgets($fp, 1024);
if (strcmp($res, "VERIFIED") == 0)
{
// TODO:
// Check the payment_status is Completed
// Check that txn_id has not been previously processed
// Check that receiver_email is your Primary PayPal email
// Check that payment_amount/payment_currency are correct
// Process payment
// If 'VERIFIED', send an email of IPN variables and values to the
// specified email address
foreach ($_POST as $key => $value)
{
$emailtext .= $key . " = " . $value . "\n\n";
}
mail($email, "Live-VERIFIED IPN", $emailtext . "\n\n" . $req);
}
else if (strcmp($res, "INVALID") == 0)
{
// If 'INVALID', send an email. TODO: Log for manual investigation.
foreach ($_POST as $key => $value)
{
$emailtext .= $key . " = " . $value . "\n\n";
}
mail($email, "Live-INVALID IPN", $emailtext . "\n\n" . $req);
}
}
fclose($fp);
}
?>