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                **一.mixed定義** #mixed是PHP8中添加的偽類型,用于聲明參數的類型、返回值、屬性可以是任何類型。mixed包含了null類型、類對象、callable和resource類型. ``` function show(mixed $name){ var_dump($name); } show(true); ``` &emsp; **二.mixed與聯合類型** #mixed等效于所有類型的聯合類型 ``` string|int|float|bool|null|array|object|callable|resource ``` &emsp; **三.禁止強類型轉換** ``` $foo = (mixed) $bar; $name='user1'; echo (mixed)$name; ``` &emsp; **四.禁止與強他類型一起組合聯合類型** ``` string|int|mixed function show(mixed|null $name){ var_dump($name); } show(true); ``` &emsp; **五.默認類型** 1.當函數參數或類屬性未聲明顯式類型時,現在假定該類型為mixed 2.對于返回類型,缺少顯式返回類型等于mixed|void,但不能人工設置mixed|void,因為mixed不能聯合其他類型. #PHP支持void偽返回類型,以指示該函數將不返回任何內容。這相當于缺少沒有設置顯式值的return語句. #mxied返回類型 ``` function show($name):mixed{ var_dump($name); return 1; } echo show(true); ``` #void返回類型 ``` function show($name):void{ var_dump($name); } show(true); ``` &emsp; **六.禁止使用可空mixed類型** ```?mixed``` ``` function show(?mixed $name){ var_dump($name); } show(true); ``` &emsp; **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)
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