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<?php $arr1 = ["apple" => "bla", "peer" => "bleh"]; $arr2 = ["apple" => "foo", "bar" => "baz"]; $totalKeys = array_merge(array_keys($arr1), array_keys($arr2)); var_dump($totalKeys);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(5) "apple" [1]=> string(4) "peer" [2]=> string(5) "apple" [3]=> string(3) "bar" }

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