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;  /**   * Constructor   *   * $config is an instance of Zend_Config or an array of key/value pairs containing configuration options for   * Zend_Session_SaveHandler_Memcached . These are the configuration options for   * Zend_Session_SaveHandler_Memcached:   *   *   *   sessionId    => The id of the current session   *   sessionName   => The name of the current session   *   sessionSavePath => The save path of the current session   *   * modified      => (string) Session last modification time column   *   * lifetime     => (integer) Session lifetime (optional; default: ini_get("session.gc_maxlifetime"))   *   * overrideLifetime => (boolean) Whether or not the lifetime of an existing session should be overridden   *   (optional; default: false)   *   * @param Zend_Config|array $config   User-provided configuration   * @return void   * @throws Zend_Session_SaveHandler_Exception   */  public function __construct($config)  {    if ($config instanceof Zend_Config) {      $config = $config->toArray();    } else if (!is_array($config)) {      /**       * @see Zend_Session_SaveHandler_Exception       */      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);    }  }  /**   * 创建memcached连接对象   *   * @return void   */  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();  }  /**   * Set session lifetime and optional whether or not the lifetime of an existing session should be overridden   *   * $lifetime === false resets lifetime to session.gc_maxlifetime   *   * @param int $lifetime   * @param boolean $overrideLifetime (optional)   * @return Zend_Session_SaveHandler_Memcached   */  public function setLifetime($lifetime, $overrideLifetime = null)  {    if ($lifetime < 0) {      /**       * @see Zend_Session_SaveHandler_Exception       */      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;  }  /**   * Retrieve session lifetime   *   * @return int   */  public function getLifetime()  {    return $this->_lifetime;  }  /**   * Set whether or not the lifetime of an existing session should be overridden   *   * @param boolean $overrideLifetime   * @return Zend_Session_SaveHandler_Memcached   */  public function setOverrideLifetime($overrideLifetime)  {    $this->_overrideLifetime = (boolean) $overrideLifetime;    return $this;  }  public function getOverrideLifetime()  {    return $this->_overrideLifetime;  }  /**   * Retrieve session lifetime considering   *   * @param array $value   * @return int   */  public function open($save_path, $name)  {    $this->_sessionSavePath = $save_path;    $this->_sessionName   = $name;    return true;  }  /**   * Retrieve session expiration time   *   * @param * @param array $value   * @return int   */  public function close()  {    return true;  }  public function read($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）:

$config = array(  "memcached"=> array(    array(      "ip"=>"192.168.0.1",      "port"=>11211    )  ),  "lifetime" =>123334);//create your Zend_Session_SaveHandler_DbTable and//set the save handler for Zend_SessionZend_Session::setSaveHandler(new Zend_Session_SaveHandler_Memcached($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。