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run code in 150+ php & hhvm versions
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<?php $a = array(true => true,false => false,);var_dump($a);
Output for 4.3.2 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(2) { [1]=> bool(true) [0]=> bool(false) }
Output for 4.3.0 - 4.3.1
array(0) { }