Help with sending XML object from Flex to php

I have an XML object i need to send from Flex to php so that php can write it to a file. I am trying to send it using HTTPService:

Code:

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<mx:HTTPService id="sendXML" url="http://localhost/php/getXML.php" contentType="application/xml" useProxy="false" method="POST">
</mx:HTTPService>

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And my getXML.php looks like this:

PHP Code:

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<?php

$raw_xml  = file_get_contents("php://input");

$myFile = "testFile.xml";
$fh = fopen($myFile, 'w') or die("can't open file");
fwrite($fh, $raw_xml);

fclose($fh);

?>

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After i do :

Code:

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sendXML.request = inputXML;  //inputXML is my XML object i am trying to send
sendXML.send();

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I get the empty 'testFile.xml' file so i am obviously doing something wrong but can't figure it out what excatly :confused: Can someone please help me with this?

thanks in advance