HTTPRequest response and EOXML

[GreatBigBore]

I'm trying to write some PHP that will respond to an HTTPRequest. The example code that I copied looks like this:

echo(<<<EOXML
<boutellchat>
<login success="$success" message="$message"/>
</boutellchat>
EOXML
  );

I don't know anything about this '<<<EOXML' business, and I can't find any documentation on it anywhere on the internet. I'm running PHP 5.2.4, and it seems to agree with me: it hits the end of file without finding the end of the EOXML thing. Can anyone point me to some documentation on how to use this properly, or whether it's supported in 5.2.4? Thanks.