if (!$_SESSION['authenticating']) {
    $_SESSION['authenticating'] = true;
    // First thing to do is grab the username out of the post variables.
    // TODO: change from GET to POST
    //$user = fetch_user_info($username);
    $user = array('public_key' => rawurldecode($_POST['public_key']), 'random' => $_POST['random']);
    $result = TrustAuth::get_challenge($user);
    $_SESSION['server'] = $result['server'];
    $_SESSION['user'] = $user;
    echo $result['json'];
} else {
    $user = $_SESSION['user'];
    $server = $_SESSION['server'];
    if (!isset($_POST['md5']) || !isset($_POST['sha'])) {
        $result = TrustAuth::wrong_stage();
    } else {
        $user['md5'] = $_POST['md5'];
        $user['sha'] = $_POST['sha'];
        $result = TrustAuth::authenticate($user, $server, SUCCESS_URL, FAIL_URL);
        if ($result['status']) {
            $_SESSION['logged_in'] = true;
            if (($db_user = fetch_user_info($user['public_key'])) == true) {
                $_SESSION['user_id'] = $db_user['id'];
            } else {
                $_SESSION['user_id'] = add_user($user['public_key']);
            }
        }
    }
    $_SESSION['authenticating'] = false;
    echo $result['json'];
}
<?php

include 'funkcjeprofilowe.php';
$user_info = fetch_user_info($_GET['uid']);
$user_galery = fetch_galery($_GET['uid']);
$user_cwiczenia = cwiczenia($_GET['uid']);
?>
<! DOCTYPE html>
<html lang="en" class="no-js">
		<head>
				<title>On-move</title>
				<meta name="viewport" content="width=device-width, initial-scale=1.0">
				<meta charset='UTF-8'>
				<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
				<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
																<link href='https://fonts.googleapis.com/css?family=Orbitron:500' rel='stylesheet' type='text/css'>
								<link href='https://fonts.googleapis.com/css?family=Poiret+One' rel='stylesheet' type='text/css'>
								<link rel="shortcut icon" href="img/ikonka.ico">
				<link rel="stylesheet" type="text/css" href="css/normalize.css" />
				<link rel="stylesheet" type="text/css" href="css/style6.css" />
				<link href ="css/bootstrap.min.css" rel = "stylesheet">
				<link href="css/styles.css" rel = "stylesheet">
								<link href="css/fontello.css" rel = "stylesheet">

				<script src="js/modernizr-custom.js"></script>
								<script src = "js/bootstrap.js"></script>
				<script src = "js/skrypty.js"></script>