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<?php $arr = array(12, 46, 244, 0, 12, 83, 48, 98, 233, 83, 26, 91, 119, 148, 98); function first_dupe($arr) { $res = array_unique($arr); foreach ($arr as $key => $val) { if ($res[$key] !== $val) return $val; } } echo first_dupe($arr); ?>
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