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<?php class Test { public function __construct(public int $id) {} } $initialErrors = [new Test(1), new Test(2), new Test(3)]; $finalErrors = [new Test(3), new Test(4), new Test(5)]; $initialErrorsIds = array_map(fn(Test $o) => $o->id, $initialErrors); $finalErrorsIds = array_map(fn(Test $o) => $o->id, $finalErrors); print_r(array_diff($initialErrorsIds, $finalErrorsIds)); print_r(array_diff($finalErrorsIds, $initialErrorsIds));
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