将函数转换为静态

Question

我想将以下函数转换为静态函数。这个函数在类中。它工作正常。

class LoginDBHandler extends DBConnection
    {
        private $loginObj;
        private $table="user_login";
        private $statement;

        public function __construct()
        {
            parent::__construct();
            $this->loginObj=new userLogin();
        }

        //Other Non-static Methods

        public function authenticate($username,$password)
        {
                $password=password_hash($password,PASSWORD_BCRYPT,Config::$password_options);
                $this->statement=$this->pdo->prepare("select * from $this->table where username=:username and password=:password and isActive=1");
                $this->statement->bindParam(":username",$username);
                $this->statement->bindParam(":password",$password);
                $this->statement->execute();
                $this->statement->fetchAll();
                if($this->statement->rowCount()==1)
                {
                    return true;
                }
                else
                {
                    return false;
                }
        }
}

我用下面的方法试过了。

class LoginDBHandler extends DBConnection
    {
        private $loginObj;
        private $table="user_login";
        private $statement;

        public function __construct()
        {
            parent::__construct();
            $this->loginObj=new userLogin();
        }

        //Other Non-static Methods

        public static function authenticate($username,$password)
        {
                $password=password_hash($password,PASSWORD_BCRYPT,Config::$password_options);
                $this->statement=self::$pdo->prepare("select * from $this->table where username=:username and password=:password and isActive=1");
                $this->statement->bindParam(":username",$username);
                $this->statement->bindParam(":password",$password);
                $this->statement->execute();
                $this->statement->fetchAll();
                if($this->statement->rowCount()==1)
                {
                    return true;
                }
                else
                {
                    return false;
                }
        }
}

但 PDO 不可访问。我还有其他也使用 PDO 的非功能。我应该如何访问它？

数据库连接

<?php

    class DBConnection
    {
        protected $pdo;

        public function __construct()
        {
            $this->pdo = new PDO("mysql:host=localhost; dbname=db_inventory;","root","");
            $this->pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
            $this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            $this->pdo->exec("set names utf8"); 
        }

    }

?>

使用静态方法进行身份验证和其他数据库操作非静态方法是否很好？扩展类好还是我应该将getmethod用于pdo？

Answer 1

你不能在静态函数中使用 $this，你可以在静态方法中使用 static 或 self。请查看文档了解更多信息。