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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = new ArrayObject(); $a["foo"] = array(); $a["foo"][] = "bar"; $a->bar = array(); $a->bar[] = "baz"; var_dump( $a );
Output for 5.3.0 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
object(ArrayObject)#1 (2) { ["bar"]=> array(1) { [0]=> string(3) "baz" } ["storage":"ArrayObject":private]=> array(1) { ["foo"]=> array(1) { [0]=> string(3) "bar" } } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.2.17
object(ArrayObject)#1 (1) { ["foo"]=> array(1) { [0]=> string(3) "bar" } }
Output for 5.0.0 - 5.1.6
Fatal error: Objects used as arrays in post/pre increment/decrement must return values by reference in /in/5Js9E on line 5
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: arrayobject in /in/5Js9E on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: arrayobject in /in/5Js9E on line 3