Description:
------------
If the XML file conatinx &,< or > in the data field, then the simplexml_load_file fails

Reproduce code:
---------------
// * bug_file.xml : START * //
<?xml version='1.0' standalone='yes'?>
<couples>
<couple>
   <name>John&Marry</name>
   <age>John>Marry</age>
</couple>
</couples>

// * bug_file.xml : END * //
<?php

$xml = simplexml_load_file("bug_file.xml");

echo $xml->couple[0]->name; // "So this language. It's ike..."
?> 

Expected result:
----------------
This should give me the following result

John&Marry

Actual result:
--------------
The actual result is that, the function returns error.