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<?php class NumberReturner { private $nums; public function __construct($nums) { $this->nums = $nums; } public function resolve() { return $this->nums; } } $objs = [new NumberReturner([1, 2, 3, 4]), new NumberReturner([1, 2, 5, 6]), new NumberReturner([1, 2, 6])]; $result = array_shift($objs)->resolve(); foreach ($objs as $obj) { $result = array_intersect($obj->resolve()); } var_dump($result);

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