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<?php $first = Array(607,608,609,610); $second = Array(608,607,609); $arr = array_merge($first, $second); var_dump(array_diff($arr, array_diff_assoc($arr, array_unique($arr))));
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [3]=> int(610) }

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