Paypal IPN will just not work properly

Question

This is my code:

// post back to PayPal system to validate
$header .= "POST cgi-bin/webscr HTTP/1.1\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
    $header .="Host: www.paypal.com\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
    $header .="Connection: close\r\n\r\n";
$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);

if (!$fp) { // HTTP ERROR
    echo 'HTTP ERROR';
} else {

    fputs ($fp, $header . $req);
    while (!feof($fp)) { $res = fgets ($fp, 2048); }

        if (strpos ($res), "VERIFIED") !== false) {
            switch ($transaction_type) {
                case "subscr_payment": 
                    if ($payment_status == "Completed" &&strtolower($receiver_email) == strtolower($receiverEmail)&&$currency=$payment_currency)

Earlier I had tried entering the trim statement into this line:

if (strpos ($res, "VERIFIED") !== false)

I changed it to:

if (strcmp (trim($res), 'VERIFIED') == 0)

Answer 1

Your 'Connection: close' header (which ends with \r\n) is correctly followed by a blank line (i.e. another \r\n), being the last header, but so is the previous header ('Content-Length'). So the 'Connection: close' header is being seen as part of the payload. Remove the blank line from the previous header, i.e. change the 2nd-last \r\n\r\n to \r\n. In fact I would change them both, and add another print of \r\n after the last header, so you won't break it like this again.