**一.父子類使用過程中，同名方法的參數類型規則：子類的參數類型要包含父類的參數類型** ``` class Person{ public function show(int $name){ } } class User extends Person{ public function show($name){ } } ```   **二.子類同名方法的參數類型不包含父類方法的參數類型** 1.普通 ``` class Foo { public function process(int $item): array{} } class SuperFoo extends Foo{ public function process(string $items): array{} } ``` 2.抽象 ``` abstract class Person{ abstract function show(int $name); } class User extends Person{ public function show(string $name){ } } ```   **三.trait中同名普通方法參數可不同** ``` trait Foo { public function inParams(int $item){ } } class SuperFoo{ use Foo; public function inParams(string $items){ } } ```   **四.trait中同名抽象方法參數類型必須相同** ``` trait Person { abstract function show(int $name); } class User{ use Person; public function show(mixed $name){ } } ```   **配套的PHP8新特性詳解視頻教程，請查看以下專輯** 鏈接：[https://www.ixigua.com/6937490165329822219](https://www.ixigua.com/6937490165329822219)