我们是否可以将会话变量传递给类

我试图将会话变量传递到下面的类中。然而，它似乎并没有工作，并引发以下错误：我们是否可以将会话变量传递给类

Parse error: syntax error, unexpected T_VARIABLE in C:\wamp\www\pard_config\configuration.php on line 6

我该如何解决这个问题？

我的代码：

<?php 
    session_start(); 
    class pardEngine{ 
     public $hostname = $_SESSION['HOSTNAME']; 
     public $database = $_SESSION['DATABASE']; 
     public $database_user = $_SESSION['USER']; 
     public $database_user_pass = $_SESSION['PASSWORD']; 
    } 
?>

来源

2013-04-12 dilini

在这个类的constructor分配这些属性，而不是这样。

来源

2013-04-12 12:05:28

session_start(); 
class pardEngine{ 
    public function __construct(){ 
    $hostname = $_SESSION['HOSTNAME']; 
    $database = $_SESSION['DATABASE']; 
    $database_user = $_SESSION['USER']; 
    $database_user_pass = $_SESSION['PASSWORD']; 
    } 
    }

来源

2013-04-12 12:07:51

您不能在类声明部分中分配这些值。

利用构造函数。

session_start(); 
class pardEngine{ 
     function __construct() { 
      $hostname = $_SESSION['HOSTNAME']; 
      $database = $_SESSION['DATABASE']; 
      $database_user = $_SESSION['USER']; 
      $database_user_pass = $_SESSION['PASSWORD']; 

     } 
}

来源

2013-04-12 12:08:21

从Properties手册页：

Class member variables are called "properties". You may also see them referred to using other terms such as "attributes" or "fields", but for the purposes of this reference we will use "properties". They are defined by using one of the keywords public, protected, or private, followed by a normal variable declaration. This declaration may include an initialization, but this initialization must be a constant value--that is, it must be able to be evaluated at compile time and must not depend on run-time information in order to be evaluated.

会话数据不适合在编译时类别，这样你的属性只能与普通的代码进行设置，或者在类外（因为他们是公共的）或来自方法（可能是构造函数）。

这通常不实际的硬编码这些值到一个类代码，所以我会去的构造方法：

<?php 

class pardEngine{ 
    private $hostname; 
    private $database; 
    private $database_user; 
    private $database_user_pass; 

    public function __construct($hostname, $database, $database_user, $database_user_pass){ 
     $this->hostname = $hostname; 
     $this->database = $database; 
     $this->database_user = $database_user; 
     $this->database_user_pass = $database_user_pass; 
    } 
} 


session_start(); 
$engine = new pardEngine($_SESSION['HOSTNAME'], $_SESSION['DATABASE'], $_SESSION['USER'], $_SESSION['PASSWORD']);

来源

2013-04-12 12:10:02

创建一个功能即能创建对象组成的数组：

class pardEngine 
{ 
    public $hostname; 
    public $database; 
    public $database_user; 
    public $database_user_pass; 

    /** 
    * @param array $array 
    * @return partEngine 
    */ 
    public static function createFromArray($array) { 
     $obj      = new static; 
     $obj->hostname   = $array['HOSTNAME']; 
     $obj->database   = $array['DATABASE']; 
     $obj->database_user  = $array['USER']; 
     $obj->database_user_pass = $array['PASSWORD']; 

     return $obj; 
    } 
}

用法：

session_start(); 
$engine = pardEngine::createFromArray($_SESSION);

来源

2013-04-12 12:11:40

我们是否可以将会话变量传递给类

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