PHP 在其他函数中使用参数 - PHP using Parameters in other functions

PHP using Parameters in other functions

本文关键字：参数函数其他 PHP | 更新日期: 2023-09-27

关于OOP的一般问题我有这个类

class User{
    //call DB connection
    function User($userId){
    }
    function getMenu(){
        return $userId;
    }
}

我如何能够仅使用 getMenu 函数中的$userId

$user = new User($userId);
echo $user->getMenu();

提前谢谢你。

通过使其成为类属性：

class User{
    //Since you're not inheriting you can also make this property private
    protected $userId; //Or private $userId;
    /* As of PHP 5.3.3, methods with the same name as the last element of a 
      namespaced class name will no longer be treated as constructor. 
      This change doesn't affect non-namespaced classes.*/
    //call DB connection
    public function __construct($userId){ 
        $this->userId = $userId;
    }
    public function getMenu(){
        return $this->userId;
    }
}

这确实是OOP的基础，我建议您阅读一些教程来解释OOP的工作原理