CDATA tags don't appear in XML file when saved

1

When sending an XML string which includes CDATA tags to the server, the
XML file is saved correctly but the CDATA tags disappear.

In the Flash movie I create a variable (xmlString) to which contains
some lines with CDATA tags, for example::

xmlString += " <material><mattext
texttype=‘text/html’><![CDATA["+currentString[j]+"]]></mattext></material>
";

I create an XML object and send the string to a PHP script on the
server:

    addActivity = new XML(xmlString); 
    addActivity.contentType = "text/xml"; 
    addActivity.ignoreWhite = true; 
    addActivity.sendAndLoad("addActivity.php", moXML);

The PHP script looks like this:

<?php
$my_xml = $GLOBALS[“HTTP_RAW_POST_DATA”];
$xml_output = simplexml_load_string($my_xml);
$filename=$xml_output->filename;
$handle= fopen($filename,‘w’);
fwrite($handle, “$HTTP_RAW_POST_DATA”);
fclose($handle);
echo $my_xml;
?>

The file is saved but the CDATA tags disappear. Any ideas as to why this
is happening? Any help would be appreciated.

Birgit