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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(array( false => 0, true => 1, null => 0 ));
Output for 4.3.2 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> int(0) [1]=> int(1) [""]=> int(0) }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.3.1
array(1) { [""]=> int(0) }