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run code in 150+ php & hhvm versions
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<?php var_dump(array_filter(array('a' => false, 'b' => null, 'c' => 0, 'd' => 1, 'e' => -1, 'f' => true)));
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { ["d"]=> int(1) ["e"]=> int(-1) ["f"]=> bool(true) }
Output for hhvm-3.10.0

Process exited with code 153.