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run code in 200+ php & hhvm versions
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<?php $a = [1,2,3]; $b = &$a; foreach($a as $k=>$v) {echo "$v\n"; unset($a[1]);} var_dump($a);
Output for 7.0.0 - 7.3.0rc4
1 2 3 array(2) { [0]=> int(1) [2]=> int(3) }
Output for 5.5.0 - 5.6.28
1 3 array(2) { [0]=> int(1) [2]=> int(3) }