function PPHttpPost($methodName_, $nvpStr_, $PayPalApiUsername, $PayPalApiPassword, $PayPalApiSignature, $PayPalMode) {

// Set up your API credentials, PayPal end point, and API version.

$API_UserName = urlencode($PayPalApiUsername);

$API_Password = urlencode($PayPalApiPassword);

$API_Signature = urlencode($PayPalApiSignature);

$paypalmode = ($PayPalMode=='sandbox') ? '.sandbox' : '';

$API_Endpoint = "https://api-3t".$paypalmode.".paypal.com/nvp";

$version = urlencode('109.0');

// Set the curl parameters.

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $API_Endpoint);

curl_setopt($ch, CURLOPT_VERBOSE, 1);

// Turn off the server and peer verification (TrustManager Concept).

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);

curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($ch, CURLOPT_POST, 1);

// Set the API operation, version, and API signature in the request.

$nvpreq = "METHOD=$methodName_&VERSION=$version&PWD=$API_Password&USER=$API_UserName&SIGNATURE=$API_Signature$nvpStr_";

// Set the request as a POST FIELD for curl.

curl_setopt($ch, CURLOPT_POSTFIELDS, $nvpreq);

// Get response from the server.

$httpResponse = curl_exec($ch);

if(!$httpResponse) {

exit("$methodName_ failed: ".curl_error($ch).'('.curl_errno($ch).')');

}

// Extract the response details.

$httpResponseAr = explode("&", $httpResponse);

$httpParsedResponseAr = array();

foreach ($httpResponseAr as $i => $value) {

$tmpAr = explode("=", $value);

if(sizeof($tmpAr) > 1) {

$httpParsedResponseAr[$tmpAr[0]] = $tmpAr[1];

}

}

if((0 == sizeof($httpParsedResponseAr)) || !array_key_exists('ACK', $httpParsedResponseAr)) {

exit("Invalid HTTP Response for POST request($nvpreq) to $API_Endpoint.");

}

return $httpParsedResponseAr;

}