function validate_ipn()
{
global $ipn_data, $ipn_response, $paypal_url;
$url_parsed = parse_url($paypal_url);
$post_string = '';
foreach ($_POST as $field => $value) {
$ipn_data["{$field}"] = $value;
$post_string .= $field . '=' . urlencode(stripslashes($value)) . '&';
}
$post_string .= "cmd=_notify-validate";
// append ipn command
// open the connection to paypal
$fp = fsockopen($url_parsed['host'], "80", $err_num, $err_str, 30);
if (!$fp) {
$sql = 'insert into tb_dump (cdate,msg) values ("' . date('d-m-y H:i:s') . '","fsockopen error no. ' . $errnum . ': ' . $errstr . '")';
$result = mysql_query($sql);
return false;
} else {
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)) {
$ipn_response .= fgets($fp, 1024);
}
fclose($fp);
// close connection
}
if (stripos($ipn_response, "VERIFIED") > 0) {
log_ipn_results(true, $last_error);
return true;
} else {
$last_error = 'IPN Validation Failed.';
log_ipn_results(false, $last_error);
return false;
}
}
fputs($fp, $post_string . "\r\n\r\n");
// loop through the response from the server and append to variable
while (!feof($fp)) {
$ipn_response .= fgets($fp, 1024);
}
fclose($fp);
// close connection
}
if (eregi("VERIFIED", $ipn_response)) {
// Valid IPN transaction.
log_ipn_results(true);
exit;
} else {
// Invalid IPN transaction. Check the log for details.
$last_error = 'IPN Validation Failed.';
log_ipn_results(false);
exit;
}
function log_ipn_results($success)
{
global $ipn_data, $last_error, $ipn_response;
// Timestamp
$text = '[' . date('m/d/Y g:i A') . '] - ';
// Success or failure being logged?
if ($success) {
$text .= "SUCCESS!\n";
} else {
$text .= 'FAIL: ' . $last_error . "\n";
}
// Log the POST variables
$text .= "IPN POST Vars from Paypal:\n";
