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run code in 150+ php & hhvm versions
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<?php $a = range(1,10); foreach ($a as $i => $b) { if ($b % 2) { unset($a[$i]); } } var_dump($a);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(5) { [1]=> int(2) [3]=> int(4) [5]=> int(6) [7]=> int(8) [9]=> int(10) }
Output for hhvm-3.10.0

Process exited with code 153.