$tree = "";
$name = "";

function print_mailboxes($start = ""){

	global $mbox;
	global $tree,$name;
	
	$list = imap_getmailboxes($mbox, "{localhost:143/novalidate-cert}$start", "%");
	
	if (is_array($list)) {
	    foreach ($list as $key => $val) {
		  $space = "   ";
		  $spaces = substr_count($start, ".");
		  $spaces = str_repeat($space, $spaces);
		  $name = str_replace("{localhost:143/novalidate-cert}$start", "", $val->name);
		  $name = str_replace(".", "", $name);
		   $tree .= $spaces.$name."<br>";
			if (!($val->attributes & LATT_HASNOCHILDREN)) {
				if(empty($start)){
					$next = $start;
				} else{
					$next = $start . ".";
				}
				//print $next . $name . "<br>";
				print_mailboxes($next . $name);
			}
	    }
	}
	
	return $tree;
	
}

print print_mailboxes();