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）:

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

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。