<?php
  $url = 'http://praktika1.cs.tlu.ee/~kais/Tasemehindaja/hindaja.php';
  $data=[];
  if(isSet($_REQUEST["sisu"])){
     $data = array('sisu' => $_REQUEST["sisu"]);
  }

  $options = array(
    'http' => array(
        'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
        'method'  => 'POST',
        'content' => http_build_query($data)
    )
);
$context  = stream_context_create($options);
$result = file_get_contents($url, false, $context);
if ($result === FALSE) { echo "Viga"; }
else {echo $result;}