最初にerror_reporting(E_ALL)、開発時に常にエラー報告を有効にし、さらにIPNをテキストファイルに記録して（明らかに安全な場所に）参照して、実際のIPNが受信され、ルーターなどを通過しているかどうかを確認します
一見すると、テーブルに空白のレコードを挿入しようとしているのに、ステートメントuserに閉じ括弧が追加されていないことがわかります。)
users次に、おそらくタイプミスで別のテーブルを更新します: suscribed、非推奨のmysql_escape_string関数を使用しないでください...mysql_real_escape_string代わりに使用するか、準備済みステートメントを使用することをお勧めします。
編集: 作業できる簡単な例です。これには、PDO と IPN のログが含まれます。それが役に立てば幸い。
<?php
/**Simple Paypal validation class**/
class paypal_class {
var $last_error;
var $ipn_log;
var $ipn_log_file;
var $ipn_response;
var $ipn_data = array();
function paypal_class() {
$this->paypal_url = 'https://www.paypal.com/cgi-bin/webscr';
$this->last_error = '';
$this->ipn_response = '';
$this->ipn_log_file = 'ipn_results.log';
$this->ipn_log = true;
}
function validate_ipn(){
$url_parsed=parse_url($this->paypal_url);
$post_string = '';
foreach($_POST as $field=>$value){
$this->ipn_data["$field"] = $value;
$post_string .= $field.'='.urlencode(stripslashes($value)).'&';
}
$post_string.="cmd=_notify-validate";
$fp = fsockopen($url_parsed[host],"80",$err_num,$err_str,30);
if(!$fp){
$this->last_error = "fsockopen error no. $errnum: $errstr";
$this->log_ipn_results(false);
return false;
}else{
// Post the data back to paypal
fputs($fp, "POST $url_parsed[path] HTTP/1.1\r\n");
fputs($fp, "Host: $url_parsed[host]\r\n");
fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");
fputs($fp, "Content-length: ".strlen($post_string)."\r\n");
fputs($fp, "Connection: close\r\n\r\n");
fputs($fp, $post_string . "\r\n\r\n");
while(!feof($fp)){
$this->ipn_response .= fgets($fp, 1024);
}
fclose($fp);
}
if(eregi("VERIFIED",$this->ipn_response)){
$this->ipn_log(true);
return true;
}else{
$this->last_error = 'IPN Validation Failed.';
$this->ipn_log(false);
return false;
}
}
function ipn_log($success){
if (!$this->ipn_log) return;
$text = '['.date('m/d/Y g:i A').'] - ';
if ($success) $text .= "SUCCESS!\n";
else $text .= 'FAIL: '.$this->last_error."\n";
$text .= "IPN POST Vars from Paypal:\n";
foreach ($this->ipn_data as $key=>$value) {
$text .= "$key=$value, ";
}
$text .= "\nIPN Response from Paypal Server:\n ".$this->ipn_response;
$fp=fopen($this->ipn_log_file,'a');
fwrite($fp, $text . "\n\n");
fclose($fp);
}
}
class database{
/**PDO Connect**/
public function connect($host,$db,$user,$pass){
$this->dbh = new PDO('mysql:host='.$host.';dbname='.$db, $user, $pass);
}
/**Pre Query for prepared statement**/
public function update_valid($email){
$this->value = $email;
$this->prepare();
}
/**Delete pending user, when user clicks cancel @ paypal**/
public function delete_pending($email){
$this->result = $this->dbh->prepare('DELETE FROM users where email=":value" and subscribed=0');
$this->result->bindParam(':value', $email);
$this->execute();
}
/**Prepare query for insert**/
private function prepare(){
/* Execute a prepared statement by binding PHP variables */
$this->result = $this->dbh->prepare('UPDATE users SET subscribed=1 WHERE email=":value"');
$this->result->bindParam(':value', $this->value);
$this->execute();
}
/**Execute prepared statement**/
private function execute(){
$this->result->execute();
}
/**Close db**/
public function close(){
$this->result = null;
}
}
?>
<?php
//Handle payment (Set You IPN url too http://yoursite.com?payment=ipn & Cancel url to http://yoursite.com?payment=cancel)
if(isset($_GET['payment'])){
switch ($_GET['payment']) {
case 'cancel':
//Order Cancelled
$db=new database();
$db->connect('localhost','table','root','password');
$db->delete_pending($_SESSION['email']); //hold email in session after submitting form
$db->close();
header('Location: index.php');
die();
break;
case 'ipn':
$pp = new paypal_class;
if ($pp->validate_ipn()){
//Success
$db=new database();
$db->connect('localhost','table','root','password');
$db->update_valid($ipn['payer_email']);
$db->close();
}
die();
break;
}
}
?>