function test_error_handler($err_no, $err_msg, $filename, $linenum, $vars) {
        if (error_reporting() != 0) {
                // report non-silenced errors
                echo "Error: $err_no - $err_msg, $filename($linenum)\n";
        }
}
set_error_handler('test_error_handler');



class classWithToString
{
        public function __toString() {
                return "Class A object";
        }
}

class classWithoutToString
{
}

$variation_array = array(
  'instance of classWithToString' => new classWithToString(),
  'instance of classWithoutToString' => new classWithoutToString(),
  );
