Question

我使用面向对象编程来存储要在整个网站中使用的用户值。但是，我遇到了一个特定的问题。我试图在一个类中创建一个功能，该功能可以将用户的值（登录后）存储到实例化的类中。到目前为止，Class中的所有方法都会执行，并且会话变为“登录”。这很棒。但是我试图从用户那里获得的值并没有存储到类中的属性中。

class Users {

public $User_ID;     
public $Password;
public $First_name;
public $Surname;
public $Email;
public $User_lvl;

public static function authenticate($Email, $Password) {
global $database;
$sql  = "SELECT * FROM Users ";
$sql .= "WHERE Email = '{$Email}' ";
$sql .= "AND Password = '{$Password}' ";
$sql .= "LIMIT 1";
self::find_by_sql($sql);
$result_array = self::find_by_sql($sql);
    return !empty($result_array) ? array_shift($result_array) : false;
  }


public static function find_by_sql($sql="") {
global $database;
$result_set = $database->query($sql);
$object_array = array();
while ($row = $database->fetch_array($result_set)) {
  $object_array[] = self::instantiate($row);
    }
 return $object_array;
}

public function fetch_array($result_set) {
return mysqli_fetch_array($result_set);
 }

private static function instantiate($row) {
$object = new self;
    foreach($row as $attribute=>$value){
      if($object->has_attribute($attribute)) {
        $object->$attribute = $value;
      }
    }
return $object; 
}

private function has_attribute($attribute) {
  $object_vars = get_object_vars($this);
  return array_key_exists($attribute, $object_vars);
}

此类似乎没有被实例化为尝试从类中调用非静态函数不起作用。因此，没有获得这些值，并且没有实例化该类。请任何人帮我解决这个问题，我非常感激。

Answer 1

我为您准备了可以使用的OOP课程。

将全局移至DBService基类。

将self调用更改为用户实例。

class User {

    private $userId;
    private $password;
    private $firstName;
    private $surname;
    private $email;
    private $userLevel;

    function __construct($userId, $password, $firstName, $surname, $email, $userLevel) {
        $this->userId = $userId;
        $this->password = $password;
        $this->firstName = $firstName;
        $this->surname = $surname;
        $this->email = $email;
        $this->userLevel = $userLevel;
    }

    function getUserId() {
        return $this->userId;
    }

    function getPassword() {
        return $this->password;
    }

    function getFirstName() {
        return $this->firstName;
    }

    function getSurname() {
        return $this->surname;
    }

    function getEmail() {
        return $this->email;
    }

    function getUserLevel() {
        return $this->userLevel;
    }

    function setUserId($userId) {
        $this->userId = $userId;
    }

    function setPassword($password) {
        $this->password = $password;
    }

    function setFirstName($firstName) {
        $this->firstName = $firstName;
    }

    function setSurname($surname) {
        $this->surname = $surname;
    }

    function setEmail($email) {
        $this->email = $email;
    }

    function setUserLevel($userLevel) {
        $this->userLevel = $userLevel;
    }

}

class UserDBServiceImpl extends DBService implements UserDBService {

    public function authenticate($Email, $Password) {
        global $database;
        $sql = "SELECT * FROM Users ";
        $sql .= "WHERE Email = '{$Email}' ";
        $sql .= "AND Password = '{$Password}' ";
        $sql .= "LIMIT 1";
        self::find_by_sql($sql);
        $result_array = self::find_by_sql($sql);
        return !empty($result_array) ? array_shift($result_array) : false;
    }

    public function find_by_sql($sql = "") {

        $result_set = $database->query($sql);
        $object_array = array();
        while ($row = $database->fetch_array($result_set)) {
            $object_array[] = self::instantiate($row);
        }
        return $object_array;
    }

    public function fetch_array($result_set) {
        return mysqli_fetch_array($result_set);
    }

    private function instantiate($row) {
        $object = new self;
        foreach ($row as $attribute => $value) {
            if ($object->has_attribute($attribute)) {
                $object->$attribute = $value;
            }
        }
        return $object;
    }

    private function has_attribute($attribute) {
        $object_vars = get_object_vars($this);
        return array_key_exists($attribute, $object_vars);
    }

}

class DBService {

    private $database = null;

    private function init() {
        $this->database = ""; // Create connection to database
    }

    protected static function getInstance() {
        if ($database == null)
            init();
        return $database;
    }

}

interface UserDBService {

    public function authenticate($Email, $Password);

    public function find_by_sql($sql = "");

    public function fetch_array($result_set);

    function instantiate($row);

    function has_attribute($attribute);
}

Answer 2

使用标准property_exists()代替has_attribute()。另外，使用mysqli_fetch_assoc的{{1}}内容来阻止获取混合的数字/关联键。

使用面向对象的编程来存储用户值

2 个答案: