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<?php $a = [ 'a' => ['first' => 1], 'b' => ['first' => 2], 'c' => ['first' => 3], ]; foreach ($a as &$i) { $i['second'] = $i['first']; } unset($i); foreach ($a as $i) {} var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["a"]=> array(2) { ["first"]=> int(1) ["second"]=> int(1) } ["b"]=> array(2) { ["first"]=> int(2) ["second"]=> int(2) } ["c"]=> array(2) { ["first"]=> int(3) ["second"]=> int(3) } }

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