gistfile1.php

<?php

$object = new stdClass();

$object->{'property'} = 'value 1';
$object->{'42'} = 'value 2';

$array = (array)$object;

var_dump($array);
//array(2) {
//    ["property"]=> string(7) "value 1"
//    ["42"]=> string(7) "value 2"
//}

var_dump($array['property']);
// string(7) "value 1"

var_dump($array['42']);
// PHP Notice:  Undefined index: 42 in /home/mva/test.php on line 19
// NULL
~