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<?php $a = ['a'=>1,'b'=>2,'c'=>3]; $b = ['a'=>'aa','b'=>'bb']; var_dump(array_combine( array_map( function($key) use ($b) { return isset($b[$key]) ? $b[$key] : $key; }, array_keys($a) ), array_values($a) ));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["aa"]=> int(1) ["bb"]=> int(2) ["c"]=> int(3) }

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