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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = new ArrayObject(); $a["foo"] = "bar"; var_dump($a["foo"]);
based on lLQoj
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(3) "bar"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: arrayobject in /in/90haR 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/90haR on line 3