$url = "http://www.example.com/login";
$postData = array("user" => ontuts, "password" => "test");
/*Convierte el array en el formato adecuado para cURL*/
$elements = array();
foreach ($postData as $name=>$value) {
$elements[] = "{$name}=".urlencode($value);
}
$handler = curl_init();
curl_setopt($handler, CURLOPT_URL, $url);
curl_setopt($handler, CURLOPT_POST,true);
curl_setopt($handler, CURLOPT_POSTFIELDS, $elements);
$response = curl_exec ($handler);
curl_close($handler);
http://web.ontuts.com/tutoriales/apr...a-curl-en-php/