达维营-前端网php版本是7.4，使用phpstorm声明变量时提示：Missing property's type declaration on protected property
代码如下：
private $code;从PHP7.4开始，可以在属性上声明类型，因此此代码声明其类型，便可以消除此提示：
private string $code;PhpStorm 提示 Missing property’s type declaration on protected property
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