Paypal Success transation return values empty-- sometimes - string

Question

There is a problem with my paypal Integration in live site.
For 90% of transactions, I didn't get any problem. Some times only I am facing this below problem.
Problem: After successful transaction, I am not getting Pay pal values like Transaction Id, Message etc. All values shows empty. It comes for 10% of transactions only. please tell me what may be the problem. Can't able to find out the reason
Thanks in Advance..

Answer 1

$paypal_email = '5345345345345f';
$cur_dir='http://'.$_SERVER['SERVER_NAME'] . dirname($_SERVER['REQUEST_URI']);
$return_url = $cur_dir.'/paymentsucess.php';
$cancel_url = $cur_dir.'/payment-not-sucess.php';
$notify_url = $cur_dir.'/payments.php';
extract($_POST);
$item_name = $exam_name;
$item_amount = $amount;
$userid=$userid;
if (!isset($_POST["txn_id"]) && !isset($_POST["txn_type"])){
$querystring = "?business=".urlencode($paypal_email)."&";
$querystring .= "item_name=".urlencode($item_name)."&";
$querystring .= "amount=".urlencode($item_amount)."&";
//loop for posted values and append to querystring
foreach($_POST as $key => $value){
$value = urlencode(stripslashes($value));
$querystring .= "$key=$value&";
}
$querystring .= "return=".urlencode(stripslashes($return_url))."&";
$querystring .= "cancel_return=".urlencode(stripslashes($cancel_url))."&";
$querystring .= "notify_url=".urlencode($notify_url);
header('location:https://www.paypal.com/cgi-bin/webscr'.$querystring);
exit();
}else{
$req = 'cmd=_notify-validate';
foreach ($_POST as $key => $value) {
$value = urlencode(stripslashes($value));
$value = preg_replace('/(.*[^%^0^D])(%0A) (.*)/i','${1}%0D%0A${3}',$value);// IPN fix
$req .= "&$key=$value";
}
$data['item_name'] = $_POST['item_name'];
$data['item_number'] = $_POST['item_number'];
$data['payment_status'] = $_POST['payment_status'];
$data['payment_amount'] = $_POST['mc_gross'];
$data['payment_currency'] = $_POST['mc_currency'];
$data['txn_id'] = $_POST['txn_id'];
$data['receiver_email'] = $_POST['receiver_email'];
$data['payer_email'] = $_POST['payer_email'];
$data['custom'] = $_POST['custom'];
$data['userid'] = $_POST['userid'];
// post back to PayPal system 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, $errstr, 30);
if (!$fp) {
// HTTP ERROR
} else {
fputs ($fp, $header . $req);
while (!feof($fp)) {
$res = fgets ($fp, 1024);
if (strcmp ($res, "VERIFIED") == 0) {
// Validate payment (Check unique txnid & correct price)
$valid_txnid = check_txnid($data['txn_id']);
$valid_price = check_price($data['payment_amount'], $data['item_number']);
// PAYMENT VALIDATED & VERIFIED!
if($valid_txnid && $valid_price){
$orderid = updatePayments($data);
if($orderid){
}else{
}
}else{
}
}else if (strcmp ($res, "INVALID") == 0) {
}
}
fclose ($fp);
}
}