Description:
------------
Hi,
I'm running PHP 5.2.5, on Latest Apache alone.
I've enable only mysql extension, I've in php.ini short_open_tag = Off, I'd like to output text into xml so when I declare a string "<?xml version=\"1.0\"\x3F>\n"; I've escaped the " by the manual but it's not working,

even 

$xml  = "<";
echo $xml;

don't works too.

Why ? I think that it's a bug.

Reproduce code:
---------------
<?php
include "mysql_login.php";

@mysql_connect($host, $user, $pwd)
or die("Could not connect to MySQL server!\n");

@mysql_select_db($db)
or die("Could not select database!");

$query = "SELECT * FROM route WHERE linea=8 ORDER BY vertex";
$result = mysql_query($query);

$xml  = "<?xml version=\"1.0\"\x3F>\n";

echo $xml;
?>

Expected result:
----------------
<?xml version="1.0"?>

Actual result:
--------------
Nothing