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<?php $foo = array( 'a' => 1, 'b' => '1', 'c' => 1, '1' => '2', 1 => 2, ); function change_keys($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(4) { ["#a"]=> int(1) ["#b"]=> string(1) "1" ["#c"]=> int(1) ["#1"]=> int(2) }

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