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run code in 150+ php & hhvm versions
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<?php $x = array( false => 'b', true => 'a', ); var_dump($x);
based on Z5oJv
Output for 4.3.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(1) "b" [1]=> string(1) "a" }
Output for 4.3.0 - 4.3.1
array(0) { }