#2 Warnings in addressbook

[Anonymous]

If you haven't data in your addressbook you've got a
lot warnings. The problem is the following line in
addressbook.php:
if (in_array($letters[$i], $a_letters)) {

$a_letters isn't a array when you have no data in your
addressbook. Change it into:
if (@in_array($letters[$i], $a_letters)) {
or change the error_reporting() for the whole application.