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<?php var_dump(array( false => 0, true => 1, ));
Output for 4.3.2 - 5.6.22, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> int(0) [1]=> int(1) }
Output for 4.3.0 - 4.3.1
array(0) { }