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run code in 150+ php & hhvm versions
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<?php $array = array(true=>'true',false=>'false'); var_dump($array); var_dump(isset($array[true]));
Output for 4.3.2 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { [1]=> string(4) "true" [0]=> string(5) "false" } bool(true)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.3.1
array(0) { } bool(false)