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<?php $array = [ [1 => 'french', 2 => 'dutch'], [1 => 'french', 3 => 'english'], [1 => 'dutch'], [4 => 'swedish'], ]; var_dump(array_unique(array_merge(...$array)));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(6) "french" [1]=> string(5) "dutch" [3]=> string(7) "english" [5]=> string(7) "swedish" }

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