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

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33.98 ms | 402 KiB | 5 Q