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run code in 150+ php & hhvm versions
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<?php $a = new ArrayObject(); $a[0] = 'pizza'; $a[1] = 'time'; var_dump(is_object($a)); var_dump($a);
based on IdAqn
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true) object(ArrayObject)#1 (1) { ["storage":"ArrayObject":private]=> array(2) { [0]=> string(5) "pizza" [1]=> string(4) "time" } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.17
bool(true) object(ArrayObject)#1 (2) { [0]=> string(5) "pizza" [1]=> string(4) "time" }
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: arrayobject in /in/YcNuX on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: arrayobject in /in/YcNuX on line 2