2017-04-03 78 views
1

我已經在數據庫中設置了會話存儲。當我撥打session_destroy時,它會在數據庫中搜索特定session_id以刪除它。爲什麼會話ID經常變化?

由於會話ID經常變化,新的session_id與之前存儲的db session_id不匹配,所以這些會話數據不會被刪除。即使gc也無法正常工作。所有會話數據都被保存到數據庫中,但不會被破壞。

DbSessionHandler.php

class DbSessionHandler implements SessionHandlerInterface{ 

public $dbconnect; 
public function __construct($db){ 
    $this->dbconnect=$db; 
    session_set_save_handler(
     array($this, 'open'), 
     array($this, 'close'), 
     array($this, 'read'), 
     array($this, 'write'), 
     array($this, 'destroy'), 
     array($this, 'gc') 
    ); 
    register_shutdown_function(session_write_close()); 
    session_start(); 
} 

//make sure whether db connection is successfull 
public function open($savepath, $id) 
{ 
    return $this->dbconnect ? true : false; 
} 

public function close() 
{ 
    return true; 
} 

//read from database based on id, always return a string even if it is empty 
public function read($id) 
{ 
    $data = ""; //declare empty string, if no data found, can return this empty string 
    $session_row = $this->dbconnect->prepare("select session_data from session_store where session_id=:id"); 
    $session_row->execute(array(":id" => $id)); 
    if ($session_row->rowCount() > 0) { 
     $datas = $session_row->fetch(); 
     $data=$datas["session_data"]; 
    } 
    return $data; 

} 

/** 
* Write session_data using replace query (which does either insert or update) 
*/ 
public function write($id, $data) 
{ 
    if(!(empty($data))) { 
     $time = time(); 
     $session_write = $this->dbconnect->prepare("REPLACE INTO session_store VALUES(:id,:data,:expire)"); 
     if ($session_write->execute(array(":id" => $id, ":data" => $data, ":expire" => $time))) { 
      return true; 
     } 
    } 
    return false; 
} 

/** 
* Destroy 
*/ 
public function destroy($id) 
{ 
    $destroy = $this->dbconnect->prepare("delete from session_store where session_id = :id"); 
    if ($destroy->execute(array(":id" => $id))) { 
     return true; 
    } 
    return false; 
} 

/** 
* Garbage Collection 
*/ 
public function gc($max) 
{ 
    //Delete all records who have passed the expiration time 
    $time=time(); 
    $delete = $this->dbconnect->prepare("delete from session_store where session_expire < :oldtime"); 
    if ($delete->execute(array(":oldtime" => $time - $max))) { 
     return true; 
    } 
    return false; 
} 

}

其啓動會話

php文件:

function initiate_session() 
{ 
$session_hash = 'sha512'; 
$session_name = 'some_name'; 
$secure = false; 
$httponly = true; 
ini_set('session.use_only_cookies', 1); 
ini_set('session.hash_function', $session_hash); 
ini_set('session.hash_bits_per_character', 5); 
$cookieParams = session_get_cookie_params(); 
session_set_cookie_params($cookieParams['lifetime'], $cookieParams['path'], $cookieParams['domain'], $secure, $httponly); 
session_name($session_name); 
new DbSessionHandler(db_connect()); 

}

session_id

在此圖片中,您可以看到,表中的session_id和腳本中的session_id不同,使得數據庫中的會話數據不會被刪除。

+0

Session_id是否更改記錄的用戶或新用戶? –

+0

登錄的用戶。有時會刪除一些會話記錄,因爲沒有會話ID更改。有時它不會因相同用戶的不同會話ID而被刪除。所以事情並不總是會話ID的變化。 – Learning

回答

-1

嘗試使用此 session_regenerate_id(true);

傳遞TRUE布爾值會在創建另一個時破壞舊的會話ID。你可以將這個添加到initiate_session()函數中。

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