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<?php function format(array &$collection) { foreach($collection as $k => $v) { $collection["prefix_{$k}"] = $v; } } $collection = array('a' => 1, 'b' => 2, 'c' => 3); var_dump($collection); format($collection); var_dump($collection);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } array(6) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) ["prefix_a"]=> int(1) ["prefix_b"]=> int(2) ["prefix_c"]=> int(3) }

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