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run code in 150+ php & hhvm versions
Bugs & Features
<?php $data = false; var_dump(isset($unknown)); var_dump(isset($data)); $a = "72"; var_dump( isset($a["foo"]) );
Output for 5.0.0 - 5.0.2, 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false) bool(true) bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.4.9, 5.0.3 - 5.3.29
bool(false) bool(true) bool(true)