curl not redirecting as expected - php

Question

Any idea why this function is not redirecting to paypal.com and instead I am staying on the same page? curl is activated on the server, safe mode is off and openbasedir is turned off too.
function curl_post($url, array $post = NULL, array $options = array())
{
$defaults = array(
CURLOPT_POST => 1,
CURLOPT_HEADER => 0,
CURLOPT_URL => $url,
CURLOPT_FRESH_CONNECT => 1,
CURLOPT_RETURNTRANSFER => 1,
CURLOPT_FORBID_REUSE => 1,
CURLOPT_TIMEOUT => 4,
CURLOPT_POSTFIELDS => http_build_query($post)
);
$ch = curl_init();
curl_setopt_array($ch, ($options + $defaults));
if( ! $result = curl_exec($ch))
{
trigger_error(curl_error($ch));
}
curl_close($ch);
return $result;
}
curl_post("https://www.paypal.com/cgi-bin/webscr",$_POST);
Any idea what am I doing wrong?

Answer 1

After you make curl request:
foreach ($parameters as $key => $value) {
$requestParams[] = $key . '=' . $value;
}
$requestParams = implode ('&', $requestParams);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $requestParams);
curl_setopt($ch, CURLOPT_RETURNTRANSFER);
curl_setopt( $ch, CURLOPT_AUTOREFERER, true);
$result = curl_exec($ch);
You should get exact url, to know where you should be redirected:
$location = curl_getinfo($ch)['redirect_url'];
And then redirect:
header('Location: '. $location);

Answer 2

cURL is just a library for initiating and firing HTTP and FTP requests.
Your code just sends a HTTP POST request to the PayPal server.
In order to redirect the user, send a Location header (before any output!):
header('Location: https://www.paypal.com/...');