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run code in 150+ php & hhvm versions
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<?php $a = array(1,2,3,4); foreach ($a as $k => $v) { echo $k, ':', $v, "\n"; if ($k == 2) { $a[8] = 16; } } print_r($a);
Output for 4.3.0 - 7.1.0
0:1 1:2 2:3 3:4 Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [8] => 16 )