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<?php $array = [ 7 => [49 => null, 41 => null], 8 => [70 => null, 69 => null], 105 => null, 9 => null, 10 => null ]; array_walk_recursive($array, fn(&$v, $k) => $v = $k); var_export($array);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 7 => array ( 49 => 49, 41 => 41, ), 8 => array ( 70 => 70, 69 => 69, ), 105 => 105, 9 => 9, 10 => 10, )

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