<?php
$opts = array(
           'http'=>array(
                   'method'=>'POST',
                   'header'=>'Content-type: application/x-www-form-urlencoded',
                )
);
$opts['http']['content'] = json_encode(
                                       array('login'=> $_POST['login'],
                                             'pass'=> $_POST['pass'],
                                             'note'=> $_POST['note'])
                                             );
$context = stream_context_create($opts);

$st = file_get_contents('https://ei3.rld.org/rest/api/student/create.php', false, $context);