YII學習第三，SESSION和COOKIE的使用

一，在Yii中使用session 

1，CHttpSession 

與原生态php5的session使用差别是，php5使用session_start();$_session['key'] = $value; 

在yii中，session已經被封裝。 

To start the session, call open(); To complete and send out session data, call close(); To destroy the session, call destroy(). 

If autoStart is set true, the session will be started automatically when the application component is initialized by the application. 

/***** 方式一、執行個體添加 *****/
$session=new CHttpSession;
$session->open();
$value1=$session['name1'];

/***** 方式二、直接調用應用添加 *****/
Yii::app()->session->add('name','foobar');
Yii::app()->session->add('name2','foobar');
Yii::app()->session->add('name3','foobar');
//或者
$session = Yii::app()->session;
$session['key'] = 'value';
var_dump($session['key']);
 
//周遊
foreach($session as $name=>$value)      

 一個執行個體

$session = new CHttpSession;
$session->open();
    
$user_id = $this->user->id;
$sessionKey = $user_id.'_is_sending';
    
if(isset($session[$sessionKey])){
  $first_submit_time = $session[$sessionKey];
  $current_time      = time();
  if($current_time - $first_submit_time < 10){
    $session[$sessionKey] = $current_time;
    $this->response(array('status'=>1, 'msg'=>'不能在10秒鐘内連續發送兩次。'));
  }else{
    unset($session[$sessionKey]);//超過限制時間，釋放session";
  }
}

//第一次點選确認按鈕時執行
if(!isset($session[$sessionKey])){
  $session[$sessionKey] = time();
}
    
var_dump($sessionKey);var_dump($session[$sessionKey]);exit();      

 在index.php 

在$app->run();前 

$session = Yii::app()->session;
session_set_save_handler(
  array($session,'openSession'),
  array($session,'closeSession'),
  array($session,'readSession'),
  array($session,'writeSession'),
  array($session,'destroySession'),
  array($session,'gcSession')
);      

 2，CDbHttpSession 

CDbHttpSession繼承自 CHttpSession ，把session資料存儲在資料庫中（表名是YiiSession）， 

The table name can be changed by setting sessionTableName. If the table does not exist, it will be automatically created if autoCreateSessionTable is set true. 

The following is the table structure: 

CREATE TABLE YiiSession 

( 

    id CHAR(32) PRIMARY KEY, 

    expire INTEGER, 

    data TEXT 

) 

CDbHttpSession relies on PDO to access database. 

By default, it will use an SQLite3 database named 'session-YiiVersion.db' under the application runtime directory. You can also specify connectionID so that it makes use of a DB application component to access database. 

When using CDbHttpSession in a production server, we recommend you pre-create the session DB table and set autoCreateSessionTable to be false. This will greatly improve the performance. You may also create a DB index for the 'expire' column in the session table to further improve the performance. 

CREATE TABLE `YiiSession` (
  `id` char(32) NOT NULL,
  `expire` int(11) default NULL,
  `data` text,
  PRIMARY KEY  (`id`),
  KEY `expire` (`expire`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;      

 例，在../config/main.php中配置 

'session'=>array(
      'class' => 'CDbHttpSession',
      'autoStart' => true,
      'sessionTableName'=>'YiiSession',
      'autoCreateSessionTable'=> false,
      'connectionID'=>'db',
    ),      

// 檢索一個名為$name的cookie值
$cookie=Yii::app()->request->cookies[$name];
$value=$cookie->value;
......
// 設定一個cookie
$cookie=new CHttpCookie($name,$value);
Yii::app()->request->cookies[$name]=$cookie;