Paypal IPN Issue with parallel payment

I figured out how to parse the adaptive payments IPN in PHP.

I used the DecodePayPalIPN() function by donut2d https://www.x.com/developers/paypal/forums/adaptive-payments-api/php-technique-parsing-adaptive-payment-ipn-posts?page=0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C0%2C1 in combination with one of the example listeners that is on the paypal website and here is my complete Codeigniter IPN Listener for adaptive payments with a parallel transaction.

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');class Paypal_ipn extends CI_Controller {    public function index() {        // read the post from PayPal system and add 'cmd'        $req = 'cmd=_notify-validate&'.file_get_contents("php://input");        $header = null;        // 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.sandbox.paypal.com', 443, $errno, $errstr, 30);        $raw_post = file_get_contents("php://input");        $post_array = $this->decodePayPalIPN($raw_post);        //log_message('error', "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");        //$log1 = var_export($post_array, true);        //log_message('error', $log1);        //log_message('error', "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");        if(isset($post_array['sender_email'])) {            $sender_email = $post_array['sender_email'];        }        if(isset($post_array['status'])) {            $status = $post_array['status'];        }        if(isset($post_array['payment_request_date'])) {            $payment_request_date = $post_array['payment_request_date'];        }        if(isset($post_array['transaction'][0]['receiver'])) {            $receiver0 = $post_array['transaction'][0]['receiver'];        }        if(isset($post_array['transaction'][1]['receiver'])) {            $receiver1 = $post_array['transaction'][1]['receiver'];        }        if(isset($post_array['transaction'][0]['id'])) {            $id0 = $post_array['transaction'][0]['id'];        }        if(isset($post_array['transaction'][1]['id'])) {            $id1 = $post_array['transaction'][1]['id'];        }        if(isset($post_array['transaction'][0]['invoiceId'])) {            $invoiceId0 = $post_array['transaction'][0]['invoiceId'];        }        if(isset($post_array['transaction'][1]['invoiceId'])) {            $invoiceId1 = $post_array['transaction'][1]['invoiceId'];        }        if(isset($post_array['transaction'][0]['amount'])) {            $amount0 = $post_array['transaction'][0]['amount'];        }        if(isset($post_array['transaction'][1]['amount'])) {            $amount1 = $post_array['transaction'][1]['amount'];        }        if(isset($post_array['transaction'][0]['status'])) {            $status0 = $post_array['transaction'][0]['status'];        }        if(isset($post_array['transaction'][1]['status'])) {            $status1 = $post_array['transaction'][1]['status'];        }        if(isset($post_array['transaction'][0]['id_for_sender_txn'])) {            $id_for_sender_txn0 = $post_array['transaction'][0]['id_for_sender_txn'];        }        if(isset($post_array['transaction'][1]['id_for_sender_txn'])) {            $id_for_sender_txn1 = $post_array['transaction'][1]['id_for_sender_txn'];        }        if(isset($post_array['transaction'][0]['status_for_sender_txn'])) {            $status_for_sender_txn0 = $post_array['transaction'][0]['status_for_sender_txn'];        }        if(isset($post_array['transaction'][1]['status_for_sender_txn'])) {            $status_for_sender_txn1 = $post_array['transaction'][1]['status_for_sender_txn'];        }        if(isset($post_array['transaction'][1]['pending_reason'])) {            $pending_reason0 = $post_array['transaction'][1]['pending_reason'];        }        if(isset($post_array['transaction'][1]['pending_reason'])) {            $pending_reason1 = $post_array['transaction'][1]['pending_reason'];        }        if (!$fp) {            // HTTP ERROR        } else {            $counter = 0;            fputs ($fp, $header . $req);            while (!feof($fp)) {                $res = fgets ($fp, 1024);                if (strcmp ($res, "VERIFIED") == 0) {                    log_message('error', "sender_email = $sender_email");                    log_message('error', "payment_request_date = $payment_request_date");                    log_message('error', "status = $status");                    log_message('error', "receiver0 = $receiver0");                    log_message('error', "receiver1 = $receiver1");                    log_message('error', "id0 = $id0");                    log_message('error', "id1 = $id1");                    log_message('error', "invoiceId0 = $invoiceId0");                    log_message('error', "invoiceId1 = $invoiceId1");                    log_message('error', "amount0 = $amount0");                    log_message('error', "amount1 = $amount1");                    log_message('error', "status0 = $status0");                    log_message('error', "status1 = $status1");                    log_message('error', "id_for_sender_txn0 = $id_for_sender_txn0");                    log_message('error', "id_for_sender_txn1 = $id_for_sender_txn1");                    log_message('error', "status_for_sender_txn0 = $status_for_sender_txn0");                    log_message('error', "status_for_sender_txn1 = $status_for_sender_txn1");                    log_message('error', "pending_reason0 = $pending_reason0");                    log_message('error', "pending_reason1 = $pending_reason1");                    // check the payment_status is Completed                    // check that txn_id has not been previously processed                    // check that receiver_email is your Primary PayPal email                    // check that payment_amount/payment_currency are correct                    // process payment                    $counter++;                }                else if (strcmp ($res, "INVALID") == 0) {                    log_message('error', 'WE INVALIDDDDDDDDDDDDDDDDDD');                    $test = var_export($res, true);                    $test = str_replace(array("\r","\n"), '', $test);                    log_message('error', $test);                    log_message('error', "Problem with IPN. res = $test");                }            }            fclose ($fp);        }    }    function decodePayPalIPN($raw_post)    {        //log_message('error', "testing");        if (empty($raw_post)) {            return array();        } # else:        $post = array();        $pairs = explode('&', $raw_post);        foreach ($pairs as $pair) {            list($key, $value) = explode('=', $pair, 2);            $key = urldecode($key);            $value = urldecode($value);            # This is look for a key as simple as 'return_url' or as complex as 'somekey[x].property'            preg_match('/(\w+)(?:\[(\d+)\])?(?:\.(\w+))?/', $key, $key_parts);            switch (count($key_parts)) {                case 4:                    # Original key format: somekey[x].property                    # Converting to $post[somekey][x][property]                    if (!isset($post[$key_parts[1]])) {                        $post[$key_parts[1]] = array($key_parts[2] => array($key_parts[3] => $value));                    } else if (!isset($post[$key_parts[1]][$key_parts[2]])) {                        $post[$key_parts[1]][$key_parts[2]] = array($key_parts[3] => $value);                    } else {                        $post[$key_parts[1]][$key_parts[2]][$key_parts[3]] = $value;                    }                    break;                case 3:                    # Original key format: somekey[x]                    # Converting to $post[somkey][x]                     if (!isset($post[$key_parts[1]])) {                        $post[$key_parts[1]] = array();                    }                    $post[$key_parts[1]][$key_parts[2]] = $value;                    break;                default:                    # No special format                    $post[$key] = $value;                    break;            }#switch        }#foreach        return $post;    }#decodePayPalIPN()}