$c = curl_init('https://www.mkr.cl/users/login?redirect=/store/product/22207');
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($c, CURLOPT_AUTOREFERER, 1 );
curl_setopt($c, CURLOPT_HEADER, 1);
curl_setopt($c, CURLOPT_FOLLOWLOCATION, TRUE);
curl_setopt($c, CURLOPT_POST,true);
curl_setopt($c, CURLOPT_POSTFIELDS, 'username=76696459-1&password=7669');
curl_setopt($c, CURLOPT_COOKIEJAR, 'cookies.txt');
curl_setopt($c, CURLOPT_COOKIEFILE, 'cookies.txt');
$result = curl_exec($c);
curl_close($c);
print_r($result);