Does anyone know how to retrieve channel variables (ie. uuid, etc.) using the php example that was shown in the wiki below?

#!/usr/bin/php -q

<?php

// set a couple of things so we dont kill the system
ob_implicit_flush(true);
set_time_limit(30);

// Open stdin so we can read the data in
$in = fopen("php://stdin", "r");

// Connect
echo "connect\n\n";

// Answer
echo "sendmsg\n";
echo "call-command: execute\n";
echo "execute-app-name: answer\n\n";

// Play a prompt
echo "sendmsg\n";
echo "call-command: execute\n";
echo "execute-app-name: playback\n";
echo "execute-app-arg: /usr/local/freeswitch/sounds/en/us/callie/ivr/8000/ivr-welcome_to_freeswitch.wav\n\n";

// Wait
sleep(5);

// Hangup
echo "sendmsg\n";
echo "call-command: hangup\n\n";

fclose($in);

?>