PHP paypal IPN in sandbox returns unverified - php

Question

I have a paypal IPN script an I'm currently testing it with the sandbox. Right now though every payment I try keeps comming up as unverified. Is it because the sandbox never verifies anything or is it an error in my code?
<?php
$ourpaypal= "dmanjr_1310054821_biz#gmail.com";
// Set the request paramaeter
$req = 'cmd=_notify-validate';
// Run through the posted array
foreach ($_POST as $key => $value)
{
// If magic quotes is enabled strip slashes
if (get_magic_quotes_gpc())
{
$_POST[$key] = stripslashes($value);
$value = stripslashes($value);
}
$value = urlencode($value);
// Add the value to the request parameter
$req .= "&$key=$value";
}
$url = "http://www.paypal.com/cgi-bin/webscr";
$ch = curl_init(); // Starts the curl handler
curl_setopt($ch, CURLOPT_URL,$url); // Sets the paypal address for curl
curl_setopt($ch, CURLOPT_FAILONERROR, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); // Returns result to a variable instead of echoing
curl_setopt($ch, CURLOPT_TIMEOUT, 3); // Sets a time limit for curl in seconds (do not set too low)
curl_setopt($ch, CURLOPT_POST, 1); // Set curl to send data using post
curl_setopt($ch, CURLOPT_POSTFIELDS, $req); // Add the request parameters to the post
$result = curl_exec($ch); // run the curl process (and return the result to $result
curl_close($ch);
$errors = false;
if (strcmp ($result, "VERIFIED") == 0) // It may seem strange but this function returns 0 if the result matches the string So you MUST check it is 0 and not just do strcmp ($result, "VERIFIED") (the if will fail as it will equate the result as false)
{
$errors = true;
// Do some checks to ensure that the payment has been sent to the correct person
if ($_POST['receiver_email'] == $ourpaupal){
// Check and ensure currency and amount are correct
if ($_POST['mc_currency'] == "USD"){
require_once('DonationHandler.php');
$don = new DonationHandler();
if ($don->hasDB()){
$don->RenewMembership($_POST['option_selection2'],$_POST['mc_gross'],$_POST['payer_email'],$_POST['txn_id']);
$errors = false;
}
}
}
}
else
{
// Log an invalid request to look into
$myFile = "ipn_unverified.txt";
$fh = fopen($myFile, 'w') or die("can't open file");
fwrite($fh, "======================================================\r\n");
foreach ($_POST as $stdata){
fwrite($fh, array_search($stdata, $_POST, true).": ". $stdata."\r\n");
}
fclose($fh);
}
//If there was any error with any verified payment, place it here
if ($errors){
$myFile = "ipn_errors.txt";
$fh = fopen($myFile, 'w') or die("can't open file");
fwrite($fh, "======================================================\r\n");
foreach ($_POST as $stdata){
fwrite($fh, array_search($stdata, $_POST, true).": ". $stdata."\r\n");
}
fclose($fh);
}
?>