后端开发|php教程
Zend,Framework,session,memcach
后端开发-php教程
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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。
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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):
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require_once end/Session.php;require_once end/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 end/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 _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！
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