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Zend Framework 實作 Session 儲存至 Memcache 完整方案

編輯：PHP 相關知識

Zend Framework 實作 Session 儲存至 Memcache 完整方案

預設 Zend Framework 僅支援檔案與資料庫儲存 Session，若需跨伺服器共享 Session 或提升效能，將 Session 寫入 Memcache 是最佳選擇。本文提供完整的 Zend_Session_SaveHandler_Memcached 實作類別與設定範例。

實作 SaveHandler 類別

建立 library/Zend/Session/SaveHandler/Memcached.php，實作 Zend_Session_SaveHandler_Interface 介面，核心方法包含 read、write、destroy、gc 等：

<?php
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 $_memcached;

    public function __construct($config) {
        // 解析設定陣列，建立 Memcache 連線
        if ($config instanceof Zend_Config) $config = $config->toArray();
        foreach ($config as $key => $value) {
            switch ($key) {
                case self::MEMCACHED:
                    $this->createMemcached($value);
                    break;
                case self::LIFETIME:
                    $this->setLifetime($value);
                    break;
                case self::OVERRIDE_LIFETIME:
                    $this->setOverrideLifetime($value);
                    break;
            }
        }
    }

    public function createMemcached($config) {
        $mc = new Memcache;
        foreach ($config as $server) {
            $mc->addServer($server['ip'], $server['port']);
        }
        $this->_memcached = $mc;
    }

    public function read($id) {
        $value = $this->_memcached->get($id);
        if ($value && $this->_getExpirationTime($value) > time()) {
            return $value['data'];
        }
        return '';
    }

    public function write($id, $data) {
        $insertData = ['modified' => time(), 'data' => (string)$data];
        $value = $this->_memcached->get($id);
        if ($value) {
            $insertData['lifetime'] = $this->_getLifetime($value);
            return $this->_memcached->replace($id, $insertData);
        } else {
            $insertData['lifetime'] = $this->_lifetime;
            return $this->_memcached->add($id, $insertData, false, $this->_lifetime);
        }
    }

    public function destroy($id) {
        return $this->_memcached->delete($id);
    }

    public function gc($maxlifetime) { return true; }
    // ... 輔助方法 _getLifetime, _getExpirationTime 省略 ...
}
?>

設定與啟用

在 Bootstrap 或啟動腳本中設定 SaveHandler 並啟動 Session：

<?php
$config = [
    'memcached' => [
        ['ip' => '192.168.0.1', 'port' => 11211],
        ['ip' => '192.168.0.2', 'port' => 11211] // 支援多台分散式
    ],
    'lifetime' => 123334
];
Zend_Session::setSaveHandler(new Zend_Session_SaveHandler_Memcached($config));
Zend_Session::start();
?>