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

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