Untitled

<head>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" type="text/javascript"></script>
</head>

<body>
    <form id="target" action="main.html" method="post">
        <input type="hidden" name="hash" id="hash" value="">
        <button id="klik2">Powrót</button>
    </form>
    <a id="decoded" value="">kkk</a>
</body>

<?php
$data = $_POST["hash"];
$jsonDecoded = json_decode($data);
print $jsonDecoded->{'name'};
//echo($data);

function Decoding(string $str)
{
    define("OFFSET", 13);
    $sTmp = "";
    $sTmp = caesarDecode($str, $var = OFFSET);
    $sTmp = base64Decode($sTmp);
    $sTmp = base64Encode($sTmp);
    $sTmp = caesarEncode($sTmp, $var);
    return $sTmp;
}

...

?>