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run code in 200+ php & hhvm versions
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<?php $a = (bool)'0'; $b = empty('0'); $c = ((bool) empty('0')); var_dump($a); var_dump($b); var_dump($c);
based on aqZaQ
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
bool(false) bool(true) bool(true)