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<?php $items = array(new \stdClass(), new \stdClass()); $copy = array(); foreach ($items as $item) { $copy[] = $item; } $udiff = array_udiff($items, $copy, function ($a, $b) { return true; //$a === $b; }); var_dump($udiff, $items, $copy);

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68.66 ms | 402 KiB | 5 Q