Help with PP IPN Script - it quit working - give me your quotes please

<?php

	$datHost = "localhost";
	$datName = "*****";
	$datUser = "*****";
	$datPass = "*****";

	$datBase = mysql_connect($datHost, $datUser, $datPass);

	mysql_select_db($datName, $datBase);

//------------------------------------------------
// Read post from PayPal system and create reply
// starting with: 'cmd=_notify-validate'...
// then repeating all values sent - VALIDATION.
//------------------------------------------------


$postvars 	= array();
while (list ($key, $value) = each ($HTTP_POST_VARS))
	{
		$postvars[] = $key;
	}
$req 		= 'cmd=_notify-validate';

for ($var = 0; $var < count ($postvars); $var++)
	{
		$postvar_key 		= $postvars[$var];
		$postvar_value 		= $$postvars[$var];
		$req 			.= "&" . $postvar_key . "=" . urlencode ($postvar_value);
	}
//--------------------------------------------
// Create message to post back to PayPal...
// Open a socket to the PayPal server...
//--------------------------------------------
$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 ("www.paypal.com", 80, $errno, $errstr, 30);


//----------------------------------------------------------------------
// Check HTTP connection made to PayPal OK, If not, print an error msg
//----------------------------------------------------------------------
if (!$fp)
	{
		$res = "FAILED";
	}
else
	{
		fputs ($fp, $header . $req);

		while (!feof($fp))
			{
				$res = fgets ($fp, 1024);
				
				if (strcmp ($res, "VERIFIED") == 0)
					{
						if (strcmp($tpayment_status, "Refunded") == 0)
							{
								$parent_txn_id	= "REFUNDED|".$parent_txn_id;
								$sql			= "UPDATE pp_Payments SET payment_id = '$parent_txn_id' WHERE payer_email = '$payer_email'";
										
								mysql_query($sql,$datBase);
							}	

						if (strcmp($tpayment_status, "Reversed") == 0)
							{
								$parent_txn_id	= "REVERSED|".$parent_txn_id;
								$sql			= "UPDATE pp_Payments SET payment_id = '$parent_txn_id' WHERE payer_email = '$payer_email'";
										
								mysql_query($sql,$datBase);
							}	
														
						if (strcmp ($payment_status, "Completed") == 0 || strcmp($txn_type, "subscr_signup") == 0 || strcmp($txn_type, "subscr_cancel") == 0)
							{
								if (strcmp($txn_type, "subscr_payment") != 0 && strcmp($txn_type, "subscr_cancel") != 0)
									{
										$strIPaddress	= $_SERVER['REMOTE_ADDR'];
										$fecha 			= strtotime($payment_date);
										$Date 			= date('Y-m-d',$fecha);

										if(strcmp($txn_type, "subscr_signup") == 0)
											{
												$txn_id		= $subscr_id;
												$mc_gross	= '0.00';	
												$mc_fee		= '0.00';
											}	

												$sql = "INSERT into pp_Payments
													(
														item_name,
														item_number,
														mc_gross,
														mc_fee,
														first_name,
														last_name,
														payer_email,
														payment_date,
														payment_id,
														ip_address,
														AFF_ID
													)

													VALUES
													(
														'$item_name',
														'$item_number',
														'$mc_gross',
														'$mc_fee',
														'$first_name',
														'$last_name',
														'$payer_email',
														'$Date',
														'$txn_id',
														'$strIPaddress',
														'$custom'
													) ";

											mysql_query($sql,$datBase);
																							
											$strSubject = "Discover The Divine Truth eBook";
											$strBody   .= "Dear ".$first_name." ".$last_name.",\n\n";
											$strBody   .= "Thank you for your purchase of Discover The Divine Truth eBook! You may download the ebook including the bonus from the link below:\n\n";
											$strBody   .= "http://www.discoverthedivinetruth.com/DownLoad.php?KEYS=".$txn_id."\n\n";											
											$strBody   .= "All the Best,\n\n";
											$strBody   .= "Tino Hartung";

											mail($payer_email, $strSubject, $strBody, "From: webhomez@web.de", "-fwebhomez@web.de");
									}
									
								 if (strcmp($txn_type, "subscr_cancel") == 0)
									{
										$subscr_id = "CANCELLED|".$subscr_id;
										$sql = "UPDATE pp_Payments SET payment_id = '$subscr_id' WHERE payer_email = '$payer_email'";
										
										mysql_query($sql,$datBase);
									}	
							}

					}
			}
	}

//-------------------------------------------
// Close PayPal Connection, Log File and DB.
//-------------------------------------------

	fclose ($fp);
	mysql_close($db);

?>