1st I have to say I know nothing bout php. I was actually doing my AS3 guest-book and through parts of tutorials from Activetut, I managed to come out a flash guest-book. So the problem now I'm facing is the guest-book could only inject 1 XML data and it will always clear off the old 1, while the flash is still caching on the old XML files.
I'd found some other tutorials(which I think its quite hard since i dunno anything about php) and comparing to the php 
code I'm using, it seems to be extremely short. I have no idea what the 
code does, so currently I'm not sure whether the problems came from the php or my AS3.
 <?php
        if (isset($GLOBALS["HTTP_RAW_POST_DATA"])){
            $xml = $GLOBALS["HTTP_RAW_POST_DATA"];
            $file = fopen("wish.xml","wb");
            fwrite($file, $xml);
            fclose($file);
        }
    ?>
and below is my correct XML format:
<WISHES>
    <WISH>
        <NAME>Test</NAME>
        <EMAIL>
[email protected]</EMAIL>
        <DATENTIME>2/3/10</DATENTIME>
        <MESSAGE>Dummy Message</MESSAGE>
    </WISH>
<WISH>
        <NAME>Test</NAME>
        <EMAIL>
[email protected]</EMAIL>
        <DATENTIME>2/3/10</DATENTIME>
        <MESSAGE>Dummy Message</MESSAGE>
    </WISH>
</WISHES>
So anyone kind to explain what that php 
code does? cause it replace my XML with:
<WISH>
        <NAME>Test</NAME>
        <EMAIL>
[email protected]</EMAIL>
        <DATENTIME>2/3/10</DATENTIME>
        <MESSAGE>Dummy Message</MESSAGE>
    </WISH>