3v4l.org

run code in 150+ php & hhvm versions
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<?php $a = array('a', 'b'); foreach ($a as $key => $val) { $a[1] .= 'a'; var_dump($val); } var_dump($a);
based on k8YMM
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(1) "a" string(1) "b" array(2) { [0]=> string(1) "a" [1]=> string(3) "baa" }
Output for hhvm-3.10.0

Process exited with code 153.