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                **一.TypeError和ValueError改進作用** #在PHP 8中,內部函數參數強制執行類型和值驗證,如果不允許使用預期的類型或值,則將拋出TypeError或ValueError異常錯誤. #在PHP 8之前,這會導致PHP警告. 1.TypeError觸發條件 提供的值是不是正確的類型. 2.ValueError觸發條件 如果提供的值是正確的類型,但PHP在上下文中不可接受,則PHP會引發ValueError異常. &emsp; **二.系統函數引發TypeError** ``` substr('foo', []); try{ substr('linux',[]); }catch(TypeError $e){ echo $e->getMessage(); } ``` &emsp; **三.系統函數引發ValueError** ``` json_decode('"foo"', true, -1); try{ json_decode('"foo"', true, -1); }catch(ValueError $e){ echo $e->getMessage(); } ``` &emsp; **四.自定義函數引發TypeError** ``` function show(string $name){ var_dump($name); } show([]); ``` &emsp; **五.自定義函數引發ValueError** ``` function show(int $number){ if($number<10){ throw new ValueError('this value must be greater or equal 10'); }else{ echo $number; } } show(5); #try捕捉 function show(int $number){ if($number<10){ throw new ValueError('the number must be greater and equal 10'); }else{ echo $number; } } try{ show(5); }catch(ValueError $e){ echo $e->getMessage(); } ``` &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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