<?php
session_start();
if(isset($_POST['session']))
$_SESSION = json_decode($_POST['session']);
$s_json = json_encode($_SESSION);
?>
<html>
<head>
<title>session_doctor.php</title>
<style type="text/css">* { font-family: monospace; }</style>
</head>
<body>
<h1>session_doctor</h1>
<form action="session_doctor.php" method="post">
<textarea name="session" style="width: 80em; height: 24em;"><?=$s_json?></textarea>
<input type="submit" />
</post>
</body>
</html>