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<?php $items = array(new \stdClass(), new \stdClass()); $compare = function ($a, $b) { return $a === $b; }; $udiff = array_udiff($items, $items, $compare); var_dump($udiff); //array_unshift($items, new stdClass()); $udiff = array_udiff($items, $items, $compare); var_dump($items, $udiff);

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