3v4l.org

run code in 200+ php & hhvm versions
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<?php $a = array(1,2,3); $b = &$a; foreach($a as $i => $v) { echo "$v\n"; $a[2] = 'qqq'; unset($a[1]); } var_dump($a); var_dump($b);
based on Fp0Aa
Output for 7.0.0 - 7.2.0
1 2 3 array(2) { [0]=> int(1) [2]=> string(3) "qqq" } array(2) { [0]=> int(1) [2]=> string(3) "qqq" }
Output for 5.5.0 - 5.6.28
1 qqq array(2) { [0]=> int(1) [2]=> string(3) "qqq" } array(2) { [0]=> int(1) [2]=> string(3) "qqq" }