Mine

<?
# derived from the Aastra xml/php/agi scripts.

#include ("include/phpagi/misc.php");
include ("include/phpagi-2.14/phpagi-asmanager.php");

function isQueueMem($username,$queuenum,$userval){

        $as = new AGI_AsteriskManager();
        $res = $as->connect();

        $res = $as->Command('show queue '.$queuenum);

        $lines = split("\n",$res['data']);
        $numlines = count($lines);
        $ismem=0;

        #i starts at three and ends at numlines-4 because there is garbage
        #data there.  Same thing with the other returns from the lines split:
        #most of it we don't care about (some may be useful later, but not now.)

        for ($i=3; $i<=($numlines-4); $i++){
                $values=split(" ",$lines[$i]);
                if ($values[$userval]=="SIP/" . $username){
                        $ismem="true";
                }
        }
        # Disconnect properly
        $as->disconnect();
        return $ismem;
}

# Connect to AGI

# constant that defines which value contains the username in the return of the 'show queue' command
$uservalue = "6";

# name of the queue.  in TB they're all numbers.
$queuename="6";

# user to add
$user="6606";

if (isQueueMem($user,$queuename,$uservalue)){
        print "$user is a member of queue $queuename\n";
} else {
        print "$user is not a member of queue $queuename\n";
}
$user="6643";

if (isQueueMem($user,$queuename,$uservalue)){
        print "$user is a member of queue $queuename\n";
} else {
        print "$user is not a member of queue $queuename\n";
}
?>