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<?php $a = true; $b = false; $c = true; $d = [ ($a ? "a":null), ($b ? "b":null), ($c ? "c":null), ]; var_dump($d);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(3) { [0]=> string(1) "a" [1]=> NULL [2]=> string(1) "c" }