<?php
ini_set('error_reporting', E_ALL);
ini_set('display_errors', TRUE);
$array = new ArrayObject;
//$array = array();
$key1 = time();
$key2 = $key1 * 10;
$key3 = $key2 + 1;
$key4 = $key3 + 1;
$array[$key1] = "a";
//$array[$key2] = "b";
//$array[$key3] = "c";


echo $key1,': ',$array[$key1], "\n";
echo $key2,': ',$array[$key2], "\n";
echo $key3,': ',$array[$key3], "\n";