Zend Framework实现将session存储在memcache中的方法

本文实例讲述了Zend framework实现将session存储在memcache中的方法。分享给大家供大家参考，具体如下：

在zend framework中，已经可以将session存储在数据库中了，不过还不支持memcache，我简单得实现了一下。

下面是SaveHandler，文件名为 ：Memcached.php ，将其放在 /Zend/Session/SaveHandler 目录下，代码如下(需要有php_memcache支持,因为字符长度限制,我把部分注释去掉了):

require_once 'Zend/Session.php';
require_once 'Zend/Config.php';
class Zend_Session_SaveHandler_Memcached implements Zend_Session_SaveHandler_Interface
{
  const LIFETIME     = 'lifetime';
  const OVERRIDE_LIFETIME = 'overrideLifetime';
  const MEMCACHED      = 'memcached';
  protected $_lifetime = false;
  protected $_overrideLifetime = false;
  protected $_sessionSavePath;
  protected $_sessionName;
  protected $_memcached;
  
  public function __construct($config)
  {
    if ($config instanceof Zend_Config) {
      $config = $config->toArray();
    } else if (!is_array($config)) {
      
      require_once 'Zend/Session/SaveHandler/Exception.php';
      throw new Zend_Session_SaveHandler_Exception(
 '$config must be an instance of Zend_Config or array of key/value pairs containing '
. 'configuration options for Zend_Session_SaveHandler_Memcached .');
    }
    foreach ($config as $key => $value) {
      do {
 switch ($key) {
   case self::MEMCACHED:
     $this->createMemcached($value);
     break;
   case self::LIFETIME:
     $this->setLifetime($value);
     break;
   case self::OVERRIDE_LIFETIME:
     $this->setOverrideLifetime($value);
     break;
   default:
     // unrecognized options passed to parent::__construct()
     break 2;
 }
 unset($config[$key]);
      } while (false);
    }
  }
  
  public function createMemcached($config){
   $mc = new Memcache;
   foreach ($config as $value){
    $mc->addServer($value['ip'], $value['port']);
   }
   $this->_memcached = $mc;
  }
  public function __destruct()
  {
    Zend_Session::writeClose();
  }
  
  public function setLifetime($lifetime, $overrideLifetime = null)
  {
    if ($lifetime < 0) {
      
      require_once 'Zend/Session/SaveHandler/Exception.php';
      throw new Zend_Session_SaveHandler_Exception();
    } else if (empty($lifetime)) {
      $this->_lifetime = (int) ini_get('session.gc_maxlifetime');
    } else {
      $this->_lifetime = (int) $lifetime;
    }
    if ($overrideLifetime != null) {
      $this->setOverrideLifetime($overrideLifetime);
    }
    return $this;
  }
  
  public function getLifetime()
  {
    return $this->_lifetime;
  }
  
  public function setOverrideLifetime($overrideLifetime)
  {
    $this->_overrideLifetime = (boolean) $overrideLifetime;
    return $this;
  }
  public function getOverrideLifetime()
  {
    return $this->_overrideLifetime;
  }
  
  public function open($save_path, $name)
  {
    $this->_sessionSavePath = $save_path;
    $this->_sessionName   = $name;
    return true;
  }
  
  public function close()
  {
    return true;
  }
  public function read($id)
  {
    $return = '';
    $value = $this->_memcached->get($id); //获取数据
    if ($value) {
      if ($this->_getExpirationTime($value) > time()) {
 $return = $value['data'];
      } else {
 $this->destroy($id);
      }
    }
    return $return;
  }
  public function write($id, $data)
  {
    $return = false;
    $insertDate = array('modified' => time(),
 'data'   => (string) $data);
      $value = $this->_memcached->get($id); //获取数据
    if ($value) {
      $insertDate['lifetime'] = $this->_getLifetime($value);
      if ($this->_memcached->replace($id,$insertDate)) {
 $return = true;
      }
    } else {
      $insertDate['lifetime'] = $this->_lifetime;
      if ($this->_memcached->add($id, $insertDate,false,$this->_lifetime)) {
 $return = true;
      }
    }
    return $return;
  }
  public function destroy($id)
  {
    $return = false;
    if ($this->_memcached->delete($id)) {
      $return = true;
    }
    return $return;
  }
  public function gc($maxlifetime)
  {
    return true;
  }
  protected function _getLifetime($value)
  {
    $return = $this->_lifetime;
    if (!$this->_overrideLifetime) {
      $return = (int) $value['lifetime'];
    }
    return $return;
  }
  protected function _getExpirationTime($value)
  {
    return (int) $value['modified'] + $this->_getLifetime($value);
  }
}

配置（可以添加多台memcache服务器，做分布式）:

$config = array(
  'memcached'=> array(
    array(
      'ip'=>'192.168.0.1',
      'port'=>11211
    )
  ),
  'lifetime' =>123334
);
//create your Zend_Session_SaveHandler_DbTable and
//set the save handler for Zend_Session
Zend_Session::setSaveHandler(new Zend_Session_SaveHandler_Memcached($config));
//start your session!
Zend_Session::start();

配置好后，session的使用方法和以前一样，不用管底层是怎么实现的！

更多关于zend相关内容感兴趣的读者可查看本站专题：《Zend frameWork框架入门教程》、《php优秀开发框架总结》、《Yii框架入门及常用技巧总结》、《ThinkPHP入门教程》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家基于Zend framework框架的PHP程序设计有所帮助。