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run code in 150+ php & hhvm versions
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<?php $xs = array(42); foreach ($xs as $x) {} var_dump(current($xs));
Output for hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(42)
Output for 4.3.0 - 5.6.28
bool(false)