The "[]" array syntax causes $value to be treated as an array type, which then generates a fatal error when calculating $sum:
Fatal error: Unsupported operand types in program.php on line 2
The following Perl code is intended to look up the privileges for user ID's between 0 and 3, by performing an access of the $UserPrivilegeArray reference. It is expected that only userID 3 is an admin (since this is listed in the third element of the array).
(bad code)