3v4l.org

run code in 200+ php & hhvm versions
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<?php $key = false; print_r(array($key => 1));
based on UgqBJ
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0alpha1
Array ( [0] => 1 )