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<?php $arr1 = ["apple" => "bla", "peer" => "bleh"]; $arr2 = ["apple" => "foo", "bar" => "baz"]; $arr1Keys = array_keys($arr1); $arr2Keys = array_keys($arr2); $totalKeys = array_merge($arr1Keys, $arr2Keys); $totalKeys = $arr1Keys + $arr2Keys; var_dump($arr1Keys, $arr2Keys, $totalKeys);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(5) "apple" [1]=> string(4) "peer" } array(2) { [0]=> string(5) "apple" [1]=> string(3) "bar" } array(2) { [0]=> string(5) "apple" [1]=> string(4) "peer" }

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