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<?php $input = ['a', 'c', 'a', 'b', 'c', 'c']; $count = array_count_values($input); $duplicated = array_keys(array_diff($count, [1])); var_export($duplicated); echo PHP_EOL; echo implode(", ", $duplicated);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'a', 1 => 'c', ) a, c

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