getting Asterisk variables on agi

#!/usr/bin/php -q
<?php
include ("/var/www/html/agi/phpagi-svn/phpagi.php");
/*

$agi = new AGI();
$agi->answer();
$agi->stream_file("im-sorry");
$dstatus=$agi->get_variable("CHANNEL");
$agi->verbose($dstatus['data'])

?>