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<?php $arr = ["one", "one", "two", "two", "three"]; $count = array_count_values($arr); echo "duplicates \n"; var_dump(array_keys(array_diff($count, [1]))); echo "uniques \n"; var_dump(array_keys(array_intersect($count, [1])));
Output for git.master, git.master_jit, rfc.property-hooks
duplicates array(2) { [0]=> string(3) "one" [1]=> string(3) "two" } uniques array(1) { [0]=> string(5) "three" }

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