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                **一.構造器屬性提升作用** 構造函數屬性升級是PHP 8中的一種新語法,允許從構造函數直接進行類屬性聲明和構造函數賦值. &emsp; **二.舊代碼** ``` class User { public string $name; public function __construct(string $name) { $this->name = $name; } } ``` &emsp; **三.新代碼** ``` class User { public function __construct(public string $name;) { echo $this->name; } } ``` &emsp; **四.構造器屬性和標準屬性混合使用** ``` class User { private $uid; public function __construct(public $name,$uid) { $this->uid = $uid; } } ``` &emsp; **五.不能定義重復的屬性** ``` class User { public string $name; public function __construct(public string $name) {} } ``` &emsp; **六.構造器屬性淘汰var定義** 1.舊代碼 ``` class User { var $username; public function __construct($username) { echo $this->username=$username; } } new User('user1'); ``` 2.新代碼 ``` class User { public function __construct(var $username) {} } ``` &emsp; **七.接口不允許使用** ``` interface User { public function __construct(public string $name); } ``` &emsp; **八.抽象方法不允許使用** 1.舊代碼 ``` abstract class User { public $name; abstract public function __construct($name); } ``` 2.新代碼 ``` abstract class User{ abstract public function __construct(public $name); } ``` &emsp; **九.trait中允許使用** ``` trait User{ public function __construct(public $name){ } } ``` &emsp; ### **系統的學習PHP** 關注:PHP自學中心,回復相應的關鍵詞,領取以下視頻教程 **laravel7.x 從入門到核心架構講解** 公眾號里回復:289794 &emsp; #### **還有其他的教程的關鍵詞,請關注公眾號查看每天分享的文章教程的頭部** ![](https://img.kancloud.cn/96/af/96af322d2cdc53d3fbbe981affa60c7f_150x150.jpg)
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