PHP – 使用静态属性序列化类

当用户登录我的站点时,我创建了一个User类的实例,获取一些与用户相关的数据并将该对象存储在SESSION中.

我从数据库中获取的一些数据应该在整个会话期间保持不变,并且我希望可以从其他对象访问数据.当使用另一个对象中的值时,我更喜欢将User :: $static_value_in_class用于$_SESSION [‘static_value_in_session’],但我愿意接受说服.

问题是,当我将User实例序列化为SESSION,然后加载不同的页面时,不会记住这些值.

类定义：

class User {
    public $name;
    public static $allowed_actions;
    public function __construct($username,$password) {
        // Validate credentials,etc.
        self::$allowed_actions = get_allowed_actions_for_this_user($this);
    }   
}
class Blog {
    public static function write($text) {
        if (in_array(USER_MAY_WRITE_BLOG,User::$allowed_actions)) {
            // Write blog entry
        }
    }
}

login.php中：

$user = new User($_POST['username'],$_POST['password']);
if (successful_login($user)) {
    $_SESSION['user'] = $user;
    header('Location: index.php');
}

index.php文件：

if (!isset($_SESSION['user'])) {
    header('Location: login.php');
}
Blog::write("I'm in index.php! Hooray!")
// Won't work,because Blog requires User::$allowed_actions

我应该实现Serializable并编写我自己的serialize()和unserialize()版本来包含静态数据吗？

我应该咬我的嘴唇并从Blog类中访问$_SESSION变量吗？

我是否需要将有效的User实例发送到Blog write()方法？

或许互联网有更好的想法……

编辑：编写我的真实用例(不是完整的代码,但足以获得要点).

我的网站使用共享预算帐户处理用户组.
用户可以将集团资金投入到集团同意的某些事情上,并通过创建Transaction类的实例并将其发送到Bank类进行数据库存储来报告事务.

银行类：

class Bank {
   // Group-agreed reasons to spend money
   public static $valid_transaction_reasons;
   public function __construct(User $user) {
      Bank::$valid_transaction_reasons = load_reasons_for_this_group($user->bank_id);
   }
}

用户类：

class User {
   public $bank_id;
   public function __construct($username,$password) {
      $query = "SELECT bank_id FROM users WHERE username=$username AND password=$password";
      $result = mysql_fetch_array(mysql_query($query));
      $this->bank_id = $result['bank_id'];
   }
}

交易类：

class Transaction {
   public function __construct($reason,$amount) {
      if (!in_array($reason,Bank::$valid_transaction_reasons)) {
         // Error! Users can't spend money on this,the group doesn't cover it
      }
      else {
         // Build a Transaction object
      }
   }
}

实际代码(login.php或其他)：

$user = new User($_GET['uname'],$_GET['pword']);
$_SESSION['bank'] = new Bank($user);

// Some shit happens,user navigates to submit_transaction.php

$trans = new Transaction(REASON_BEER,5.65);
// Error! Bank::$valid_transaction_reasons is empty!

class Message {

    public static $id;

    public $instanceId;

    public $text;

    /**
     *
     */
    public function __construct($text) {
        // the id will incremented in a static var
        if(!self::$id) {
            self::$id = 1;
        } else {
            self::$id++;
        }

        // make a copy at current state
        $this->instanceId = self::$id; 
        $this->text = $text;
    }
}

$m1 = new Message('foo');
printf('created message id: %s text: %s%s',$m1->instanceId,$m1->text,PHP_EOL);
$m2 = new Message('bar');
printf('created message id: %s text: %s%s',$m2->instanceId,$m2->text,PHP_EOL);

$messages = array($m1,$m2);

$ser1 = serialize($m1);
$ser2 = serialize($m2);

$m1 = unserialize($ser1);
printf('unserialized message id: %s text: %s%s',PHP_EOL);
$m2 = unserialize($ser2);
printf('unserialized message id: %s text: %s%s',PHP_EOL);