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<?php $foo = [ 'a' => '1', 'b' => '1', 'c' => '2', ]; function change_keys($array, $callback) { return array_combine(array_map($callback, array_combine(array_keys($array), array_keys($array))), $array); } var_dump(change_keys($foo, function($v) { return '#' . $v; }));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["#a"]=> string(1) "1" ["#b"]=> string(1) "1" ["#c"]=> string(1) "2" }

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