About how Zend Framework implements session storage in memcache

This article mainly introduces the method of Zend Framework to store sessions in memcache, and analyzes the implementation techniques of storing sessions in memcache under the Zend Framework framework based on examples. Friends in need can refer to it

The example of this article describes the method of Zend Framework to store sessions in memcache. Share it with everyone for your reference, the details are as follows:

In zend framework, sessions can already be stored in the database, but memcache is not supported yet, so I simply implemented it.

The following is SaveHandler, the file name is: Memcached.php, put it in the /Zend/Session/SaveHandler directory, the code is as follows (php_memcache support is required, because of the character length limit, I removed some comments ):

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 &#39;Zend/Session/SaveHandler/Exception.php&#39;;
      throw new Zend_Session_SaveHandler_Exception();
    } else if (empty($lifetime)) {
      $this->_lifetime = (int) ini_get(&#39;session.gc_maxlifetime&#39;);
    } 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 = &#39;&#39;;
    $value = $this->_memcached->get($id); //获取数据
    if ($value) {
      if ($this->_getExpirationTime($value) > time()) {
        $return = $value[&#39;data&#39;];
      } else {
        $this->destroy($id);
      }
    }
    return $return;
  }
  public function write($id, $data)
  {
    $return = false;
    $insertDate = array(&#39;modified&#39; => time(),
               &#39;data&#39;   => (string) $data);
      $value = $this->_memcached->get($id); //获取数据
    if ($value) {
      $insertDate[&#39;lifetime&#39;] = $this->_getLifetime($value);
      if ($this->_memcached->replace($id,$insertDate)) {
        $return = true;
      }
    } else {
      $insertDate[&#39;lifetime&#39;] = $this->_lifetime;
      if ($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[&#39;lifetime&#39;];
    }
    return $return;
  }
  protected function _getExpirationTime($value)
  {
    return (int) $value[&#39;modified&#39;] + $this->_getLifetime($value);
  }
}

Configuration (you can add multiple memcache servers for distribution):

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

After configuration, the session is used as before, regardless of how the underlying layer is implemented!

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