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run code in 200+ php & hhvm versions
Bugs & Features
<?php $tst = 0; var_dump($tst, !!$tst, !!!$tst, !!!!$tst);
based on LosWN
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
int(0) bool(false) bool(true) bool(false)